Vogons Wiki - User contributions [en]

72-pin SIMM

2020-02-18T07:43:25Z

Eisapc:

72-pin SIMM or as most people call it PS/2 SIMM, as it was first introduced with the IBM PS/2 line of personal computers, is the most common memory for late socket 4, socket 5, early socket 7 and socket 8 motherboards. It is used as add on memory in caching controllers or on soundcards like the Terratec EWS64 as well. The modules have 72 Pins and a data with of the modules is 32 bit without and 36 bit with parity. While most Pentium class machines need the modules installed in pairs, 386er and 486er boards can use single modules as well. 72-pin memory was superseded by 168-pin SDRAM.

72-pin SIMMs are availiable in the following capacities:
* 1 MB, 256 Kbit x 32/36 (rare)
* 2 MB, 512 KBIT x 32/36 (common in IBM PS/2)
* 4 MB, 1 Mbit x 32/36
* 8 MB, 2 MBIT x 32/36
* 16 MB 4 MBIT x 32/36
* 32 MB 8 MBIT x 32/36
* 64 MB 16 MBIT x 32/36 (rare, not supported on many motherboards)
* 128 MB 32 MBIT x 32/36 (rare, used on some hp 9000 workstations)

It first entered the market as Fast Page Mode (FPM). From 1995 on EDO memory modules were released which were 10 - 30 % faster but refuse to work in some older hardware. The difference can often be noticd fom the appendix on the memory chips or fom the chips partnunber itself. -70 ns chips and partnumbers ending on 0 like 5117400 are usually FPM.

==Parity modules==
[[File:16mb_parity.jpg|200px|thumb|A pair of 16 MB PS/2 SIMM modules with parity. The resistors required for presence detect are in the upper right corner.]]
Like 30-pin SIMMS before 72-pin SIMMS were availiable with and without parity. Vice versa from the 30-pin modules which usually came with parity, 72-pin SIMMs with parity are not very common. Quite a number of older Compaq and IBM or higher priced equipment like servers and workstations require parity modules installed. Parity modules can be easily detected as they usually cary extra chips. While non parity modules use 2, 4, 8 or 16 chips, parity modules have 3, 6, 9, 10, 18 or 20 chips.

==EOS-modules==
[[File:32MB_eos.jpg|200px|thumb|A pair of 32 MB EOS modules]]
For some high priced servers from IBM and hp EOS-modules were availiable. These were sometimes advertised as ECC managleble SIMM, while EOS means ECC on chip. These modules can be easily recognized by the square chips on the modules.

==Presence detect==
72-pin modules have four pins used for presence detection. Tis ment the board can detect size and speed of the memory module installed by evaluating the 4 presence detect pins. While these are not commonly used by most motherboard manufacturers namely IBM made heavy use of them. Presence detect can easily modified with minor soldering skills.

==Non PC modules==
[[File:hp9000_memory.jpg|200px|thumb|A pair modules from a hp 9000 PA-RISC workstation]]
Some manufacturers of non x86 workstation released 72pin SIMMs not compatile with PCs. Notably IBM made some 40 Bit SIMMs for their RS/6000 line and hp modules from hp 9000 series are not compatible with PC-hardware.

=Sources=
*[Upgrading and Repairing PCs by Scott Mueller published 2001 (German edition)]
*[http://mcamafia.de/mcapage0/memorypd.htm Microchannel Mafia site on Presence Detect]
[[Category:Memory]]

3Com 3c509

2018-03-15T10:51:34Z

Eisapc:

{{Device Infobox/Begin
| Bus type = ISA
| Bus width = 16-bit
| Bus speed = 8 MHz
| 8-bit ISA compatible = Yes
| Manufacturer = 3 Com Corporation
| Chipset = 3Com 9513S
| Compatible with = [[Has compatibility::3C5X9]]
| Connectors = [[Has connector::AUI]], [[Has connector::BNC]], [[Has connector::RJ45]]
| Requires -5VDC = No
| Requires -12VDC = No
| Config = [[Config method::Software]]
}}
{{Device Infobox/Ethernet
| Is ROM socketed = Yes
| ROM type = 28-pin JEDEC
| Is ROM writable = No
}}
{{Device Infobox/End

}}

The '''3 Com 3C509''' is a 10Mbps network card from 3 Coms popular Etherlink III series, it was introduced in 1994. There are versions with different connector types availiable, with the Combo variant shown here being the most versatile.

== Additional photos ==

<gallery mode="packed">
Image:3c509_back.jpeg|Underside
</gallery>

== Boot ROM ==

This card's boot ROM socket will take a standard 28-pin ROM chip.

The card's DOS drivers come with a configuration program (<tt>3C50XCFG.EXE</tt>) that can be used to enable the ROM socket (it is disabled by default) and set the base address, as well as adjust all the usual options like base address and IRQ.
If used in an EISA board the card can be set to EISA mode by use of the utility and later configured by the ECU.
== Resources ==

* I/O address: 0x280, 0x300, 0x310, 0x320, 0x330, 0x340, 0x350.
* IRQ: 5, 7, 9, 10, 11, 12.
* Boot ROM size: 8 kB, 16kB, 32kB, Disabled.
* Boot ROM: 0xC0000 - 0xDE000.

== References ==

<references/>

3Com 3c509

2018-03-14T14:59:27Z

Eisapc:

{{Device Infobox/Begin
| Bus type = ISA
| Bus width = 16-bit
| Bus speed = 8 MHz
| 8-bit ISA compatible = Yes
| Manufacturer = 3 Com Corporation
| Chipset = 3Com 9513S
| Compatible with = [[Has compatibility::3C5X9]]
| Connectors = [[Has connector::AUI]], [[Has connector::BNC]], [[Has connector::RJ45]]
| Requires -5VDC = No
| Requires -12VDC = No
| Config = [[Config method::Software]]
}}
{{Device Infobox/Ethernet
| Is ROM socketed = Yes
| ROM type = 28-pin JEDEC
| Is ROM writable = No
}}
{{Device Infobox/End

}}

The '''3 Com 3C509''' is a 10Mbps network card from 3 Coms popular Etherlink III series, it was introduced in 1994. There are versions with different connector types availiable, with the Combo variant shown here being the most versatile.

== Additional photos ==

<gallery mode="packed">
Image:3c509_back.jpeg|Underside
</gallery>

== Boot ROM ==

This card's boot ROM socket will take a standard 28-pin ROM chip.

The card's DOS drivers come with a configuration program (<tt>3C50XCFG.EXE</tt>) that can be used to enable the ROM socket (it is disabled by default) and set the base address, as well as adjust all the usual options like base address and IRQ.
If used in an EISA board the card can be set to EISA mode by use oof the utility and later configured by the ECU.
== Resources ==

* I/O address: 0x280, 0x300, 0x310, 0x320, 0x330, 0x340, 0x350.
* IRQ: 5, 7, 9, 10, 11, 12.
* Boot ROM size: 8 kB, 16kB, 32kB, Disabled.
* Boot ROM: 0xC0000 - 0xDE000.

== References ==

<references/>

72-pin SIMM

2018-03-14T10:53:53Z

Eisapc:

72-pin SIMM or as most people call it PS/2 SIMM, as it was first introduced with the IBM PS/2 line of personal computers, is the most common memory for late socket 4, socket 5, early socket 7 and socket 8 motherboards. It is used as add on memory in caching controllers or on soundcards like the Terratec EWS64 as well. The modules have 72 Pins and a data with of the modules is 32 bit witout and 36 bit with parity. While most Pentium class machines need the modules installed in pairs, 386er and 486er boards can use singel modules as well. 72-pin memory was superseded by 168-pin SDRAM.

72-pin SIMMs are availiable in the following capacities:
* 1 MB, 256 Kbit x 32/36 (rare)
* 2 MB, 512 KBIT x 32/36 (common in IBM PS/2)
* 4 MB, 1 Mbit x 32/36
* 8 MB, 2 MBIT x 32/36
* 16 MB 4 MBIT x 32/36
* 32 MB 8 MBIT x 32/36
* 64 MB 16 MBIT x 32/36 (rare, not supported on many motherboards)
* 128 MB 32 MBIT x 32/36 (rare, used on some hp 9000 workstations)

It first entered the market as Fast Page Mode (FPM). From 1995 on EDO memory modules were released which were 10 - 30 % faster but refuse to work in some older hardware. The difference can often be noticd fom the appendix on the memory chips or fom the chips partnunber itself. -70 ns chips and partnumbers ending on 0 like 5117400 are usually FPM.

==Parity modules==
[[File:16mb_parity.jpg|200px|thumb|A pair of 16 MB PS/2 SIMM modules with parity. The resistors required for presence detect are in the upper right corner.]]
Like 30-pin SIMMS before 72-pin SIMMS were availiable with and without parity. Vice versa from the 30-pin modules which usually came with parity, 72-pin SIMMs with parity are not very common. Quite a number of older Compaq and IBM or higher priced equipment like servers and workstations require parity modules installed. Parity modules can be easily detected as they usually cary extra chips. While non parity modules use 2, 4, 8 or 16 chips, parity modules have 3, 6, 9, 10, 18 or 20 chips.

==EOS-modules==
[[File:32MB_eos.jpg|200px|thumb|A pair of 32 MB EOS modules]]
For some high priced servers from IBM and hp EOS-modules were availiable. These were sometimes advertised as ECC managleble SIMM, while EOS means ECC on chip. These modules can be easily recognized by the square chips on the modules.

==Presence detect==
72-pin modules have four pins used for presence detection. Tis ment the board can detect size and speed of the memory module installed by evaluating the 4 presence detect pins. While these are not commonly used by most motherboard manufacturers namely IBM made heavy use of them. Presence detect can easily modified with minor soldering skills.

==Non PC modules==
[[File:hp9000_memory.jpg|200px|thumb|A pair modules from a hp 9000 PA-RISC workstation]]
Some manufacturers of non x86 workstation released 72pin SIMMs not compatile with PCs. Notably IBM made some 40 Bit SIMMs for their RS/6000 line and hp modules from hp 9000 series are not compatible with PC-hardware.

=Sources=
*[Upgrading and Repairing PCs by Scott Mueller published 2001 (German edition)]
*[http://mcamafia.de/mcapage0/memorypd.htm Microchannel Mafia site on Presence Detect]
[[Category:Memory]]

File:Hp9000 memory.jpg

2018-03-13T22:06:02Z

Eisapc:

72-pin SIMM

2018-03-13T22:04:03Z

Eisapc: /* Non PC modules */

72-pin SIMM or as most people call it PS/2 SIMM, as it was first introduced with the IBM PS/2 line of personal computers, is the most common memory for late socket 4, socket 5, early socket 7 and socket 8 motherboards. It is used as add on memory in caching controllers or on soundcards like the Terratec EWS64 as well. The modules have 72 Pins and a data with of the modules is 32 bit witout and 36 bit with parity. While most Pentium class machines need the modules installed in pairs, 386er and 486er boards can use singel modules as well. 72-pin memory was superseded by 168-pin SDRAM.

72-pin SIMMs are availiable in the following capacities:
* 1 MB, 256 Kbit x 32/36 (rare)
* 2 MB, 512 KBIT x 32/36 (common in IBM PS/2)
* 4 MB, 1 Mbit x 32/36
* 8 MB, 2 MBIT x 32/36
* 16 MB 4 MBIT x 32/36
* 32 MB 8 MBIT x 32/36
* 64 MB 16 MBIT x 32/36 (rare, not supported on many motherboards)
* 128 MB 32 MBIT x 32/36 (rare, used on some hp 9000 workstations)

It first entered the market as Fast Page Mode (FPM). From 1995 on EDO memory modules were released which were 10 - 30 % faster but refuse to work in some older hardware. The difference can often be noticd fom the appendix on the memory chips or fom the chips partnunber itself. -70 ns chips and partnumbers ending on 0 like 5117400 are usually FPM.

==Parity modules==
[[File:16mb_parity.jpg|200px|thumb|A pair of 16 MB PS/2 SIMM modules with parity]]
Like 30-pin SIMMS before 72-pin SIMMS were availiable with and without parity. Vice versa from the 30-pin modules which usually came with parity, 72-pin SIMMs with parity are not very common. Quite a number of older Compaq and IBM or higher priced equipment like servers and workstations require parity modules installed. Parity modules can be easily detected as they usually cary extra chips. While non parity modules use 2, 4, 8 or 16 chips, parity modules have 3, 6, 9, 10, 18 or 20 chips.

==EOS-modules==
[[File:32MB_eos.jpg|200px|thumb|A pair of 32 MB EOS modules]]
For some high priced servers from IBM and hp EOS-modules were availiable. These were sometimes advertised as ECC managleble SIMM, while EOS means ECC on chip. These modules can be easily recognized by the square chips on the modules.

==Presence detect==
72-pin modules have four pins used for presence detection. While these are not commonly used namely IBM made heavy use of them. Presence detect can easily modified with minor soldering skills.

==Non PC modules==
[[File:hp9000_memory.jpg|200px|thumb|A pair modules from a hp 9000 PA-RISC workstation]]
Some manufacturers of non x86 workstation released 72pin SIMMs not compatile with PCs. Notably IBM made some 40 Bit SIMMs for their RS/6000 line and hp modules from hp 9000 series are not compatible with PC-hardware.

=Sources=
*[Upgrading and Repairing PCs by Scott Mueller published 2001 (German edition)]
*[http://mcamafia.de/mcapage0/memorypd.htm Microchannel Mafia site on Presence Detect]
[[Category:Memory]]

3Com 3c509

2018-03-13T22:01:22Z

Eisapc:

{{Device Infobox/Begin
| Bus type = ISA
| Bus width = 16-bit
| Bus speed = 8 MHz
| 8-bit ISA compatible = Yes
| Manufacturer = 3 Com Corporation
| Chipset = EN50903
| Compatible with = [[Has compatibility::NE1000]], [[Has compatibility::NE2000]]
| Connectors = [[Has connector::AUI]], [[Has connector::BNC]], [[Has connector::RJ45]]
| Requires -5VDC = No
| Requires -12VDC = No
| Config = [[Config method::Software]]
}}
{{Device Infobox/Ethernet
| Is ROM socketed = Yes
| ROM type = 28-pin JEDEC
| Is ROM writable = No
}}
{{Device Infobox/End

}}

The '''3 Com 3C509''' is a 10Mbps network card from 3 Coms popular Etherlink III series. There are versions with different connector types availiable, with the Combo variant shown here is the most versatile.

== Additional photos ==

<gallery mode="packed">
Image:3c509_back.jpeg|Underside
</gallery>

== Boot ROM ==

This card's boot ROM socket will take a standard 28-pin ROM chip. It has also been successfully tested with a 32-pin ROM chip using an adapter<ref>[http://sbfmdrv.blogspot.com.au/2015/11/retrofitting-new-eeprom-into-old-pc.html Port 388h - Retrofitting a new EEPROM into an old PC]</ref>. XTIDE will run without any problem.

The card's DOS drivers come with a configuration program (<tt>3C50XCFG.EXE</tt>) that can be used to enable the ROM socket (it is disabled by default) and set the base address, as well as adjust all the usual options like base address and IRQ.
If used in an EISA board the card can be set to EISA mode by use oof the utility and later configured by the ECU.
== Resources ==

* I/O address: 0, 20, 40, ... 3A0, 3E0, then the same increments starting at 2000, 4000, 6000, 8000, A000, C000, E000.
* IRQ: 2, 3, 4, 5, 7, 10, 11, 15, Disabled.
* Boot ROM size: 16kB, 32kB, 64kB, Disabled.
* Boot ROM: 8000, 8400, 8800, 8C00, then the same increments starting at 9000, A000, B000, C000, D000, E000 and F000.

== References ==

<references/>

File:32MB eos.jpg

2018-03-13T21:49:54Z

Eisapc: A pair of 32 MB EOS modules

A pair of 32 MB EOS modules

72-pin SIMM

2018-03-13T21:49:10Z

Eisapc: /* EOS-modules */

72-pin SIMM or as most people call it PS/2 SIMM, as it was first introduced with the IBM PS/2 line of personal computers, is the most common memory for late socket 4, socket 5, early socket 7 and socket 8 motherboards. It is used as add on memory in caching controllers or on soundcards like the Terratec EWS64 as well. The modules have 72 Pins and a data with of the modules is 32 bit witout and 36 bit with parity. While most Pentium class machines need the modules installed in pairs, 386er and 486er boards can use singel modules as well. 72-pin memory was superseded by 168-pin SDRAM.

72-pin SIMMs are availiable in the following capacities:
* 1 MB, 256 Kbit x 32/36 (rare)
* 2 MB, 512 KBIT x 32/36 (common in IBM PS/2)
* 4 MB, 1 Mbit x 32/36
* 8 MB, 2 MBIT x 32/36
* 16 MB 4 MBIT x 32/36
* 32 MB 8 MBIT x 32/36
* 64 MB 16 MBIT x 32/36 (rare, not supported on many motherboards)
* 128 MB 32 MBIT x 32/36 (rare, used on some hp 9000 workstations)

It first entered the market as Fast Page Mode (FPM). From 1995 on EDO memory modules were released which were 10 - 30 % faster but refuse to work in some older hardware. The difference can often be noticd fom the appendix on the memory chips or fom the chips partnunber itself. -70 ns chips and partnumbers ending on 0 like 5117400 are usually FPM.

==Parity modules==
[[File:16mb_parity.jpg|200px|thumb|A pair of 16 MB PS/2 SIMM modules with parity]]
Like 30-pin SIMMS before 72-pin SIMMS were availiable with and without parity. Vice versa from the 30-pin modules which usually came with parity, 72-pin SIMMs with parity are not very common. Quite a number of older Compaq and IBM or higher priced equipment like servers and workstations require parity modules installed. Parity modules can be easily detected as they usually cary extra chips. While non parity modules use 2, 4, 8 or 16 chips, parity modules have 3, 6, 9, 10, 18 or 20 chips.

==EOS-modules==
[[File:32MB_eos.jpg|200px|thumb|A pair of 32 MB EOS modules]]
For some high priced servers from IBM and hp EOS-modules were availiable. These were sometimes advertised as ECC managleble SIMM, while EOS means ECC on chip. These modules can be easily recognized by the square chips on the modules.

==Presence detect==
72-pin modules have four pins used for presence detection. While these are not commonly used namely IBM made heavy use of them. Presence detect can easily modified with minor soldering skills.

==Non PC modules==
Some manufacturers of non x86 workstation released 72pin SIMMs not compatile with PCs. Notably IBM made some 40 Bit SIMMs for their RS/6000 line and hp modules from hp 9000 series are not compatible with PC-hardware.

=Sources=
*[Upgrading and Repairing PCs by Scott Mueller published 2001 (German edition)]
*[http://mcamafia.de/mcapage0/memorypd.htm Microchannel Mafia site on Presence Detect]
[[Category:Memory]]

72-pin SIMM

2018-03-13T21:45:39Z

Eisapc: /* Parity modules */

72-pin SIMM or as most people call it PS/2 SIMM, as it was first introduced with the IBM PS/2 line of personal computers, is the most common memory for late socket 4, socket 5, early socket 7 and socket 8 motherboards. It is used as add on memory in caching controllers or on soundcards like the Terratec EWS64 as well. The modules have 72 Pins and a data with of the modules is 32 bit witout and 36 bit with parity. While most Pentium class machines need the modules installed in pairs, 386er and 486er boards can use singel modules as well. 72-pin memory was superseded by 168-pin SDRAM.

72-pin SIMMs are availiable in the following capacities:
* 1 MB, 256 Kbit x 32/36 (rare)
* 2 MB, 512 KBIT x 32/36 (common in IBM PS/2)
* 4 MB, 1 Mbit x 32/36
* 8 MB, 2 MBIT x 32/36
* 16 MB 4 MBIT x 32/36
* 32 MB 8 MBIT x 32/36
* 64 MB 16 MBIT x 32/36 (rare, not supported on many motherboards)
* 128 MB 32 MBIT x 32/36 (rare, used on some hp 9000 workstations)

It first entered the market as Fast Page Mode (FPM). From 1995 on EDO memory modules were released which were 10 - 30 % faster but refuse to work in some older hardware. The difference can often be noticd fom the appendix on the memory chips or fom the chips partnunber itself. -70 ns chips and partnumbers ending on 0 like 5117400 are usually FPM.

==Parity modules==
[[File:16mb_parity.jpg|200px|thumb|A pair of 16 MB PS/2 SIMM modules with parity]]
Like 30-pin SIMMS before 72-pin SIMMS were availiable with and without parity. Vice versa from the 30-pin modules which usually came with parity, 72-pin SIMMs with parity are not very common. Quite a number of older Compaq and IBM or higher priced equipment like servers and workstations require parity modules installed. Parity modules can be easily detected as they usually cary extra chips. While non parity modules use 2, 4, 8 or 16 chips, parity modules have 3, 6, 9, 10, 18 or 20 chips.

==EOS-modules==
For some high priced servers from IBM and hp EOS-modules were availiable. These were sometimes advertised as ECC managleble SIMM, while EOS means ECC on chip. These modules can be easily recognized by the square chips on the modules.

==Presence detect==
72-pin modules have four pins used for presence detection. While these are not commonly used namely IBM made heavy use of them. Presence detect can easily modified with minor soldering skills.

==Non PC modules==
Some manufacturers of non x86 workstation released 72pin SIMMs not compatile with PCs. Notably IBM made some 40 Bit SIMMs for their RS/6000 line and hp modules from hp 9000 series are not compatible with PC-hardware.

=Sources=
*[Upgrading and Repairing PCs by Scott Mueller published 2001 (German edition)]
*[http://mcamafia.de/mcapage0/memorypd.htm Microchannel Mafia site on Presence Detect]
[[Category:Memory]]

File:16mb parity.jpg

2018-03-13T21:45:09Z

Eisapc: A pair of 16 MB SIMMs modules with parity

A pair of 16 MB SIMMs modules with parity

72-pin SIMM

2018-03-13T21:44:25Z

Eisapc: /* Parity modules */

72-pin SIMM or as most people call it PS/2 SIMM, as it was first introduced with the IBM PS/2 line of personal computers, is the most common memory for late socket 4, socket 5, early socket 7 and socket 8 motherboards. It is used as add on memory in caching controllers or on soundcards like the Terratec EWS64 as well. The modules have 72 Pins and a data with of the modules is 32 bit witout and 36 bit with parity. While most Pentium class machines need the modules installed in pairs, 386er and 486er boards can use singel modules as well. 72-pin memory was superseded by 168-pin SDRAM.

72-pin SIMMs are availiable in the following capacities:
* 1 MB, 256 Kbit x 32/36 (rare)
* 2 MB, 512 KBIT x 32/36 (common in IBM PS/2)
* 4 MB, 1 Mbit x 32/36
* 8 MB, 2 MBIT x 32/36
* 16 MB 4 MBIT x 32/36
* 32 MB 8 MBIT x 32/36
* 64 MB 16 MBIT x 32/36 (rare, not supported on many motherboards)
* 128 MB 32 MBIT x 32/36 (rare, used on some hp 9000 workstations)

It first entered the market as Fast Page Mode (FPM). From 1995 on EDO memory modules were released which were 10 - 30 % faster but refuse to work in some older hardware. The difference can often be noticd fom the appendix on the memory chips or fom the chips partnunber itself. -70 ns chips and partnumbers ending on 0 like 5117400 are usually FPM.

==Parity modules==
[[File:16mb_parity.jpg|200px|thumb|A pair of 16 MB PS/2 SIMMs with parity]]
Like 30-pin SIMMS before 72-pin SIMMS were availiable with and without parity. Vice versa from the 30-pin modules which usually came with parity, 72-pin SIMMs with parity are not very common. Quite a number of older Compaq and IBM or higher priced equipment like servers and workstations require parity modules installed. Parity modules can be easily detected as they usually cary extra chips. While non parity modules use 2, 4, 8 or 16 chips, parity modules have 3, 6, 9, 10, 18 or 20 chips.

==EOS-modules==
For some high priced servers from IBM and hp EOS-modules were availiable. These were sometimes advertised as ECC managleble SIMM, while EOS means ECC on chip. These modules can be easily recognized by the square chips on the modules.

==Presence detect==
72-pin modules have four pins used for presence detection. While these are not commonly used namely IBM made heavy use of them. Presence detect can easily modified with minor soldering skills.

==Non PC modules==
Some manufacturers of non x86 workstation released 72pin SIMMs not compatile with PCs. Notably IBM made some 40 Bit SIMMs for their RS/6000 line and hp modules from hp 9000 series are not compatible with PC-hardware.

=Sources=
*[Upgrading and Repairing PCs by Scott Mueller published 2001 (German edition)]
*[http://mcamafia.de/mcapage0/memorypd.htm Microchannel Mafia site on Presence Detect]
[[Category:Memory]]

3Com 3c509

2018-03-13T21:41:31Z

Eisapc: /* Additional photos */

{{Device Infobox/Begin
| Bus type = ISA
| Bus width = 16-bit
| Bus speed = 8 MHz
| 8-bit ISA compatible = Yes
| Manufacturer = 3 Com Corporation
| Chipset = EN50903
| Compatible with = [[Has compatibility::NE1000]], [[Has compatibility::NE2000]]
| Connectors = [[Has connector::AUI]], [[Has connector::BNC]], [[Has connector::RJ45]]
| Requires -5VDC = No
| Requires -12VDC = No
| Config = [[Config method::Software]]
}}
{{Device Infobox/Ethernet
| Is ROM socketed = Yes
| ROM type = 28-pin JEDEC
| Is ROM writable = No
}}
{{Device Infobox/End

}}

The '''3 Com 3C509''' is a 10Mbps network card.

== Additional photos ==

<gallery mode="packed">
Image:3c509_back.jpeg|Underside
</gallery>

== Boot ROM ==

This card's boot ROM socket will take a standard 28-pin ROM chip. It has also been successfully tested with a 32-pin ROM chip using an adapter<ref>[http://sbfmdrv.blogspot.com.au/2015/11/retrofitting-new-eeprom-into-old-pc.html Port 388h - Retrofitting a new EEPROM into an old PC]</ref>. XTIDE will run without any problem.

The card's DOS drivers come with a configuration program (<tt>3C509.EXE</tt>) that can be used to enable the ROM socket (it is disabled by default) and set the base address, as well as adjust all the usual options like base address and IRQ.

== Resources ==

* I/O address: 0, 20, 40, ... 3A0, 3E0, then the same increments starting at 2000, 4000, 6000, 8000, A000, C000, E000.
* IRQ: 2, 3, 4, 5, 7, 10, 11, 15, Disabled.
* Boot ROM size: 16kB, 32kB, 64kB, Disabled.
* Boot ROM: 8000, 8400, 8800, 8C00, then the same increments starting at 9000, A000, B000, C000, D000, E000 and F000.

== References ==

<references/>

3Com 3c509

2018-03-13T21:41:08Z

Eisapc: /* Additional photos */

{{Device Infobox/Begin
| Bus type = ISA
| Bus width = 16-bit
| Bus speed = 8 MHz
| 8-bit ISA compatible = Yes
| Manufacturer = 3 Com Corporation
| Chipset = EN50903
| Compatible with = [[Has compatibility::NE1000]], [[Has compatibility::NE2000]]
| Connectors = [[Has connector::AUI]], [[Has connector::BNC]], [[Has connector::RJ45]]
| Requires -5VDC = No
| Requires -12VDC = No
| Config = [[Config method::Software]]
}}
{{Device Infobox/Ethernet
| Is ROM socketed = Yes
| ROM type = 28-pin JEDEC
| Is ROM writable = No
}}
{{Device Infobox/End

}}

The '''3 Com 3C509''' is a 10Mbps network card.

== Additional photos ==

<gallery mode="packed">
Image:3C509_back.jpeg|Underside
</gallery>

== Boot ROM ==

This card's boot ROM socket will take a standard 28-pin ROM chip. It has also been successfully tested with a 32-pin ROM chip using an adapter<ref>[http://sbfmdrv.blogspot.com.au/2015/11/retrofitting-new-eeprom-into-old-pc.html Port 388h - Retrofitting a new EEPROM into an old PC]</ref>. XTIDE will run without any problem.

The card's DOS drivers come with a configuration program (<tt>3C509.EXE</tt>) that can be used to enable the ROM socket (it is disabled by default) and set the base address, as well as adjust all the usual options like base address and IRQ.

== Resources ==

* I/O address: 0, 20, 40, ... 3A0, 3E0, then the same increments starting at 2000, 4000, 6000, 8000, A000, C000, E000.
* IRQ: 2, 3, 4, 5, 7, 10, 11, 15, Disabled.
* Boot ROM size: 16kB, 32kB, 64kB, Disabled.
* Boot ROM: 8000, 8400, 8800, 8C00, then the same increments starting at 9000, A000, B000, C000, D000, E000 and F000.

== References ==

<references/>

File:3c509 back.jpeg

2018-03-13T21:40:17Z

Eisapc:

3Com 3c509

2018-03-13T21:36:56Z

Eisapc:

{{Device Infobox/Begin
| Bus type = ISA
| Bus width = 16-bit
| Bus speed = 8 MHz
| 8-bit ISA compatible = Yes
| Manufacturer = 3 Com Corporation
| Chipset = EN50903
| Compatible with = [[Has compatibility::NE1000]], [[Has compatibility::NE2000]]
| Connectors = [[Has connector::AUI]], [[Has connector::BNC]], [[Has connector::RJ45]]
| Requires -5VDC = No
| Requires -12VDC = No
| Config = [[Config method::Software]]
}}
{{Device Infobox/Ethernet
| Is ROM socketed = Yes
| ROM type = 28-pin JEDEC
| Is ROM writable = No
}}
{{Device Infobox/End

}}

The '''3 Com 3C509''' is a 10Mbps network card.

== Additional photos ==

<gallery mode="packed">
Image:3C509_back.jpg|Underside
</gallery>

== Boot ROM ==

This card's boot ROM socket will take a standard 28-pin ROM chip. It has also been successfully tested with a 32-pin ROM chip using an adapter<ref>[http://sbfmdrv.blogspot.com.au/2015/11/retrofitting-new-eeprom-into-old-pc.html Port 388h - Retrofitting a new EEPROM into an old PC]</ref>. XTIDE will run without any problem.

The card's DOS drivers come with a configuration program (<tt>3C509.EXE</tt>) that can be used to enable the ROM socket (it is disabled by default) and set the base address, as well as adjust all the usual options like base address and IRQ.

== Resources ==

* I/O address: 0, 20, 40, ... 3A0, 3E0, then the same increments starting at 2000, 4000, 6000, 8000, A000, C000, E000.
* IRQ: 2, 3, 4, 5, 7, 10, 11, 15, Disabled.
* Boot ROM size: 16kB, 32kB, 64kB, Disabled.
* Boot ROM: 8000, 8400, 8800, 8C00, then the same increments starting at 9000, A000, B000, C000, D000, E000 and F000.

== References ==

<references/>

3Com 3c509

2018-03-13T21:34:45Z

Eisapc: /* Additional photos */

{{Device Infobox/Begin
| Bus type = ISA
| Bus width = 16-bit
| Bus speed = 8 MHz
| 8-bit ISA compatible = Yes
| Manufacturer = 3 Com Corporation
| Chipset = EN50903
| Compatible with = [[Has compatibility::NE1000]], [[Has compatibility::NE2000]]
| Connectors = [[Has connector::AUI]], [[Has connector::BNC]], [[Has connector::RJ45]]
| Requires -5VDC = No
| Requires -12VDC = No
| Config = [[Config method::Software]]
}}
{{Device Infobox/Ethernet
| Is ROM socketed = Yes
| ROM type = 28-pin JEDEC
| Is ROM writable = No
}}
{{Device Infobox/End

}}

The '''3 Com 3C509''' is a 10Mbps network card.

== Additional photos ==

<gallery mode="packed">
Image:3C509 back.jpeg|Underside
</gallery>

== Boot ROM ==

This card's boot ROM socket will take a standard 28-pin ROM chip. It has also been successfully tested with a 32-pin ROM chip using an adapter<ref>[http://sbfmdrv.blogspot.com.au/2015/11/retrofitting-new-eeprom-into-old-pc.html Port 388h - Retrofitting a new EEPROM into an old PC]</ref>. XTIDE will run without any problem.

The card's DOS drivers come with a configuration program (<tt>3C509.EXE</tt>) that can be used to enable the ROM socket (it is disabled by default) and set the base address, as well as adjust all the usual options like base address and IRQ.

== Resources ==

* I/O address: 0, 20, 40, ... 3A0, 3E0, then the same increments starting at 2000, 4000, 6000, 8000, A000, C000, E000.
* IRQ: 2, 3, 4, 5, 7, 10, 11, 15, Disabled.
* Boot ROM size: 16kB, 32kB, 64kB, Disabled.
* Boot ROM: 8000, 8400, 8800, 8C00, then the same increments starting at 9000, A000, B000, C000, D000, E000 and F000.

== References ==

<references/>

3Com 3c509

2018-03-13T21:31:36Z

Eisapc: /* Additional photos */

{{Device Infobox/Begin
| Bus type = ISA
| Bus width = 16-bit
| Bus speed = 8 MHz
| 8-bit ISA compatible = Yes
| Manufacturer = 3 Com Corporation
| Chipset = EN50903
| Compatible with = [[Has compatibility::NE1000]], [[Has compatibility::NE2000]]
| Connectors = [[Has connector::AUI]], [[Has connector::BNC]], [[Has connector::RJ45]]
| Requires -5VDC = No
| Requires -12VDC = No
| Config = [[Config method::Software]]
}}
{{Device Infobox/Ethernet
| Is ROM socketed = Yes
| ROM type = 28-pin JEDEC
| Is ROM writable = No
}}
{{Device Infobox/End

}}

The '''3 Com 3C509''' is a 10Mbps network card.

== Additional photos ==

<gallery mode="packed">
Image:3C509_back.jpg|Underside
</gallery>

== Boot ROM ==

This card's boot ROM socket will take a standard 28-pin ROM chip. It has also been successfully tested with a 32-pin ROM chip using an adapter<ref>[http://sbfmdrv.blogspot.com.au/2015/11/retrofitting-new-eeprom-into-old-pc.html Port 388h - Retrofitting a new EEPROM into an old PC]</ref>. XTIDE will run without any problem.

The card's DOS drivers come with a configuration program (<tt>3C509.EXE</tt>) that can be used to enable the ROM socket (it is disabled by default) and set the base address, as well as adjust all the usual options like base address and IRQ.

== Resources ==

* I/O address: 0, 20, 40, ... 3A0, 3E0, then the same increments starting at 2000, 4000, 6000, 8000, A000, C000, E000.
* IRQ: 2, 3, 4, 5, 7, 10, 11, 15, Disabled.
* Boot ROM size: 16kB, 32kB, 64kB, Disabled.
* Boot ROM: 8000, 8400, 8800, 8C00, then the same increments starting at 9000, A000, B000, C000, D000, E000 and F000.

== References ==

<references/>

3Com 3c509

2018-03-13T21:30:56Z

Eisapc: /* Additional photos */

{{Device Infobox/Begin
| Bus type = ISA
| Bus width = 16-bit
| Bus speed = 8 MHz
| 8-bit ISA compatible = Yes
| Manufacturer = 3 Com Corporation
| Chipset = EN50903
| Compatible with = [[Has compatibility::NE1000]], [[Has compatibility::NE2000]]
| Connectors = [[Has connector::AUI]], [[Has connector::BNC]], [[Has connector::RJ45]]
| Requires -5VDC = No
| Requires -12VDC = No
| Config = [[Config method::Software]]
}}
{{Device Infobox/Ethernet
| Is ROM socketed = Yes
| ROM type = 28-pin JEDEC
| Is ROM writable = No
}}
{{Device Infobox/End

}}

The '''3 Com 3C509''' is a 10Mbps network card.

== Additional photos ==

<gallery mode="packed">
Image:3C509_back.jpeg|Underside
</gallery>

== Boot ROM ==

This card's boot ROM socket will take a standard 28-pin ROM chip. It has also been successfully tested with a 32-pin ROM chip using an adapter<ref>[http://sbfmdrv.blogspot.com.au/2015/11/retrofitting-new-eeprom-into-old-pc.html Port 388h - Retrofitting a new EEPROM into an old PC]</ref>. XTIDE will run without any problem.

The card's DOS drivers come with a configuration program (<tt>3C509.EXE</tt>) that can be used to enable the ROM socket (it is disabled by default) and set the base address, as well as adjust all the usual options like base address and IRQ.

== Resources ==

* I/O address: 0, 20, 40, ... 3A0, 3E0, then the same increments starting at 2000, 4000, 6000, 8000, A000, C000, E000.
* IRQ: 2, 3, 4, 5, 7, 10, 11, 15, Disabled.
* Boot ROM size: 16kB, 32kB, 64kB, Disabled.
* Boot ROM: 8000, 8400, 8800, 8C00, then the same increments starting at 9000, A000, B000, C000, D000, E000 and F000.

== References ==

<references/>

3Com 3c509

2018-03-13T21:28:26Z

Eisapc: Created page with "{{Device Infobox/Begin | Bus type = ISA | Bus width = 16-bit | Bus speed = 8 MHz | 8-bit ISA compatible = Yes | Manufacturer = 3 Com Corporation | Chipset = EN50903 | C..."

{{Device Infobox/Begin
| Bus type = ISA
| Bus width = 16-bit
| Bus speed = 8 MHz
| 8-bit ISA compatible = Yes
| Manufacturer = 3 Com Corporation
| Chipset = EN50903
| Compatible with = [[Has compatibility::NE1000]], [[Has compatibility::NE2000]]
| Connectors = [[Has connector::AUI]], [[Has connector::BNC]], [[Has connector::RJ45]]
| Requires -5VDC = No
| Requires -12VDC = No
| Config = [[Config method::Software]]
}}
{{Device Infobox/Ethernet
| Is ROM socketed = Yes
| ROM type = 28-pin JEDEC
| Is ROM writable = No
}}
{{Device Infobox/End

}}

The '''3 Com 3C509''' is a 10Mbps network card.

== Additional photos ==

<gallery mode="packed">
Image:3C509_combo_back.jpg|Underside
</gallery>
== Boot ROM ==

This card's boot ROM socket will take a standard 28-pin ROM chip. It has also been successfully tested with a 32-pin ROM chip using an adapter<ref>[http://sbfmdrv.blogspot.com.au/2015/11/retrofitting-new-eeprom-into-old-pc.html Port 388h - Retrofitting a new EEPROM into an old PC]</ref>. XTIDE will run without any problem.

The card's DOS drivers come with a configuration program (<tt>3C509.EXE</tt>) that can be used to enable the ROM socket (it is disabled by default) and set the base address, as well as adjust all the usual options like base address and IRQ.

== Resources ==

* I/O address: 0, 20, 40, ... 3A0, 3E0, then the same increments starting at 2000, 4000, 6000, 8000, A000, C000, E000.
* IRQ: 2, 3, 4, 5, 7, 10, 11, 15, Disabled.
* Boot ROM size: 16kB, 32kB, 64kB, Disabled.
* Boot ROM: 8000, 8400, 8800, 8C00, then the same increments starting at 9000, A000, B000, C000, D000, E000 and F000.

== References ==

<references/>

File:3Com 3c509.jpg

2018-03-13T21:27:45Z

Eisapc:

72-pin SIMM

2018-03-13T21:04:30Z

Eisapc: Created page with " 72-pin SIMM or as most people call it PS/2 SIMM, as it was first introduced with the IBM PS/2 line of personal computers, is the most common memory for late socket 4, socket..."

72-pin SIMM or as most people call it PS/2 SIMM, as it was first introduced with the IBM PS/2 line of personal computers, is the most common memory for late socket 4, socket 5, early socket 7 and socket 8 motherboards. It is used as add on memory in caching controllers or on soundcards like the Terratec EWS64 as well. The modules have 72 Pins and a data with of the modules is 32 bit witout and 36 bit with parity. While most Pentium class machines need the modules installed in pairs, 386er and 486er boards can use singel modules as well. 72-pin memory was superseded by 168-pin SDRAM.

72-pin SIMMs are availiable in the following capacities:
* 1 MB, 256 Kbit x 32/36 (rare)
* 2 MB, 512 KBIT x 32/36 (common in IBM PS/2)
* 4 MB, 1 Mbit x 32/36
* 8 MB, 2 MBIT x 32/36
* 16 MB 4 MBIT x 32/36
* 32 MB 8 MBIT x 32/36
* 64 MB 16 MBIT x 32/36 (rare, not supported on many motherboards)
* 128 MB 32 MBIT x 32/36 (rare, used on some hp 9000 workstations)

It first entered the market as Fast Page Mode (FPM). From 1995 on EDO memory modules were released which were 10 - 30 % faster but refuse to work in some older hardware. The difference can often be noticd fom the appendix on the memory chips or fom the chips partnunber itself. -70 ns chips and partnumbers ending on 0 like 5117400 are usually FPM.

==Parity modules==
Like 30-pin SIMMS before 72-pin SIMMS were availiable with and without parity. Vice versa from the 30-pin modules which usually came with parity, 72-pin SIMMs with parity are not very common. Quite a number of older Compaq and IBM or higher priced equipment like servers and workstations require parity modules installed. Parity modules can be easily detected as they usually cary extra chips. While non parity modules use 2, 4, 8 or 16 chips, parity modules have 3, 6, 9, 10, 18 or 20 chips.

==EOS-modules==
For some high priced servers from IBM and hp EOS-modules were availiable. These were sometimes advertised as ECC managleble SIMM, while EOS means ECC on chip. These modules can be easily recognized by the square chips on the modules.

==Presence detect==
72-pin modules have four pins used for presence detection. While these are not commonly used namely IBM made heavy use of them. Presence detect can easily modified with minor soldering skills.

==Non PC modules==
Some manufacturers of non x86 workstation released 72pin SIMMs not compatile with PCs. Notably IBM made some 40 Bit SIMMs for their RS/6000 line and hp modules from hp 9000 series are not compatible with PC-hardware.

=Sources=
*[Upgrading and Repairing PCs by Scott Mueller published 2001 (German edition)]
*[http://mcamafia.de/mcapage0/memorypd.htm Microchannel Mafia site on Presence Detect]
[[Category:Memory]]