Headland HT12

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Headland HT12
Headland HT12.jpg
Bus type ISA
Bus width 16-bit
Bus speed 32 MHz
8-bit ISA compatible? Yes
Manufacturer Headland Technologies
Chipset Headland Technologies HT12
Compatible with AT
Connectors AT Keyboard
Requires -5VDC? Unknown
"Unknown" is not recognized as a Boolean (true/false) value.
Requires -12VDC? Unknown
"Unknown" is not recognized as a Boolean (true/false) value.
Config method Jumpers, Software
Motherboard
Form factor Baby AT
Power connector
CPU socket Unknown
"Unknown" is not in the list of possible values (Socket 5, Socket 7, Socket 8, Slot 1, Socket 370, PLCC68, Socket 3) for this property.
ISA slots 1 @ 8-bit
6 @ 16-bit
RAM slots 4 @ 30-pin
Maximum RAM 4MB
4,194,304 B
Boot ROM Socket, 28-pin JEDEC, read-only
Manual Vogonsdrivers
Driver 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

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