Headland were a motherboard chipset manufacturer for PC compatibles during the 80286 era. They were direct rivals of the likes of Chips & Technologies, VLSI, Texas Instruments and Suntac in the early PC chipset market. They acquired G2, a rival chipset manufacturer, around 1988, but continued to sell G2's products as the "G2 Product Line" such as the GC101 and GC102 chips which are believed to be the same as the Headland HT101/HT102 chips. Headland were bought by LSI Logic a few years later, who produced VESA Local Bus graphics controller chips.

HT101/102 (also branded as GC101/102)

An 80286 chipset released in February 1988. It supports 80286 CPUs of 12 MHz and 16 MHz.






An 80386 chipset released in March 1989.




A universal PS/2 chipset released in October 1989.



A rare single-chip 286 chipset, released in August 1990.


Launched in August 1990, HT12 was a popular 286 chipset used on many later, more tightly integrated 286 motherboards. It is able to support faster 80286 CPUs up to 20 MHz (not sure about the Harris 25 MHz) as well as hardware EMS (Expanded Memory Specification) support with special HT12 chipset drivers.

There are two drivers - one supports UMB (Upper Memory Blocks), the other adds EMS via the HT12 chipset. You can download the EMS one here. Unfortunately, the UMB one is elusive across the interwebs - let me know if you come across it.

I have written an article that focuses on getting both UMBs and EMS/XMS working with this chipset here.

Known to be used on the following systems and motherboards:

  • Commodore 286/16
  • Octek Fox II
  • GW-286
  • Advantech Industrial PC PCA-6126 (286 CPU card w/ ROM disk)
  • LM103S
  • Eurosoft HT12
  • BI-025C
  • Schneider EuroPC 286 (note: this PC's proprietary BIOS has no hardware EMS support)


A 386SX single-chip chipset launched in September 1991.


A 286 and 386SX chipset launched in August 1991. For 286-class motherboards, the HT21 supports 20 MHz CPUs.


A 286 and 386SX chipset launched in September 1991. For 286-class motherboards, the HT22 supports the Harris 80C286-25 MHz CPU.


A 386SX [up to 25 MHz] single-chip chipset, supporting CPUs from 2.7V up to 3.6V. This means it also supports the AMD Am386SXLV and Cyrix Cx486SLC CPUs.


A two-chip 80386DX chipset suitable for motherboards up to 40 MHz, launched in September 1991. It consisted of the following:

HT321 - ISA Bus Controller
HT322 - Memory Control Unit (MCU)



Codenamed "Shasta", this was a 486 chipset launched in June 1992.