Headland HT12 - Revision history

Computerguy08: /* Additional photos */

2020-04-19T14:27:51Z

‎Additional photos

Computerguy08 at 14:26, 19 April 2020

2020-04-19T14:26:55Z

Computerguy08 at 14:06, 19 April 2020

2020-04-19T14:06:43Z

Schule04 at 01:26, 24 June 2016

2016-06-24T01:26:32Z

Malvineous: Update manufacturer

2016-04-17T06:37:21Z

Update manufacturer

Malvineous: Add board

2016-03-18T06:27:38Z

Add board

New page

{{Device Infobox/Begin
| Bus type = ISA
| Bus width = 16-bit
| Bus speed = 32 MHz
| 8-bit ISA compatible = Yes
| Manufacturer =
| Chipset = Headland Technology HT12
| Compatible with = [[Compatible with::AT]]
| Connectors = [[Has connector::AT Keyboard]]
| Config = [[Config method::Jumpers]], [[Config method::Software]]
| Requires -5VDC =
| Requires -12VDC =
}}
{{Device Infobox/Motherboard
| Form factor = Baby AT
| ISA slots/8-bit = 1
| ISA slots/16-bit = 6
| RAM slots/30-pin = 4
| Max RAM = 4MB
| Is ROM socketed = Yes
| ROM type = 28-pin JEDEC
| Is ROM writable = No
}}
{{Device Infobox/End
| Manual = [http://www.vogonsdrivers.com/getfile.php?fileid=903 Vogonsdrivers]
| Driver = [http://www.vogonsdrivers.com/getfile.php?fileid=839 Vogonsdrivers]
}}

The '''Headland HT12''' is a 286 motherboard capable of up to 16MHz operation, with hardware EMS support.

The manufacturer of this board is currently unknown, so it has been documented here as the Headland HT12.

== Additional photos ==

<gallery mode="packed">
Image:Headland HT12 underside.jpg|Underside
Image:Headland HT12 BIOS.png|CMOS setup (todo)
</gallery>

== Memory ==

=== Hardware EMS ===

This motherboard works with the HT12 chipset drivers, which provide an EMS interface allowing a chosen amount of memory above 1MB to be accessed as EMS. Thus it is possible for this board to be configured to have conventional, EMS, XMS and Int15 extended memory available, all at the same time.

=== UMBs ===

The chipset does not natively support backfilling unused parts of upper memory with UMBs. However if EMS support is not required, third party drivers can use the hardware EMS facility to make a small amount of memory available in as UMBs.

== External links ==

* [https://th99.bl4ckb0x.de/m/U-Z/30198.htm TH99]

@@ Line 39: / Line 39: @@
 Image:Headland HT12 underside.jpg|Underside
 Image:FOX2_286.jpg|Octek FOX II 286
-Image:HT12_AMIBIOS.png|CMOS setup
+Image:HT12_AMIBIOS.jpg|CMOS setup
-Image:HT12_DIAGNOSTICS.png|Diagnostics menu
+Image:HT12_DIAGNOSTICS.jpg|Diagnostics menu
 Image:HT12_board.jpg|Another HT12 board
 </gallery>

@@ Line 28: / Line 28: @@
 The '''Headland HT12''' was a chipset commonly found in many late 286 motherboards from the early 90s.
-These boards have either socketed or soldered CPUs, mainly Harris or AMD, which can reach up to 16MHz operation, with hardware EMS support.
+These boards have either socketed or soldered CPUs, mainly Harris or AMD, which can reach up to 16MHz operation.
-The maximum amount of RAM is 4MB. These boards usually came with AMIBIOS and onboard diagnostics written into the ROM.
+The maximum amount of RAM is 4MB, with hardware EMS support. These boards usually came with AMIBIOS and onboard diagnostics written into the ROM.
 The manufacturer of some of these board is unknown, so it has been documented here as the Headland HT12.
@@ Line 39: / Line 39: @@
 Image:Headland HT12 underside.jpg|Underside
 Image:FOX2_286.jpg|Octek FOX II 286
-Image:Headland HT12 BIOS.png|CMOS setup (todo)
+Image:HT12_AMIBIOS.png|CMOS setup
 Image:HT12_board.jpg|Another HT12 board
 </gallery>

@@ Line 27: / Line 27: @@
 }}
-The '''Headland HT12''' is a 286 motherboard capable of up to 16MHz operation, with hardware EMS support.
+The '''Headland HT12''' was a chipset commonly found in many late 286 motherboards from the early 90s.
-The manufacturer of this board is currently unknown, so it has been documented here as the Headland HT12.
+The maximum amount of RAM is 4MB. These boards usually came with AMIBIOS and onboard diagnostics written into the ROM.
 == Additional photos ==
@@ Line 35: / Line 38: @@
 <gallery mode="packed">
 Image:Headland HT12 underside.jpg|Underside
 Image:Headland HT12 BIOS.png|CMOS setup (todo)
 Image:HT12_board.jpg|Another HT12 board

@@ Line 4: / Line 4: @@
   | Bus speed = 32 MHz
   | 8-bit ISA compatible = Yes
-  | Manufacturer =
+  | Manufacturer = Headland Technologies <!-- assumed -->
-  | Chipset = Headland Technology HT12
+  | Chipset = Headland Technologies HT12
   | Compatible with = [[Compatible with::AT]]
   | Connectors = [[Has connector::AT Keyboard]]