DOS Days

Texas Instruments

Texas Instruments, often abbreviated simply to "TI" were a huge multinational organisation with influence across almost all technologies. Specifically in the early PC market, they were an authorised fabricator of microprocessors, and also produced integrated chipsets for XT-, 286- and 386-compatibles. At the time, they rivalled VLSI, Chips & Technologies, Headland and Suntac in the early PC chipset market.

TACT80101 Chipset

The TACT80101 was a single-chip chipset for XT motherboards. A clone of this chipset was also produced by UMC with part number UM82C088AF.

It is known to have been used on the following motherboards:

Datasheet (of the UMC clone which is pin-compatible)

TACT82000 Chipset

The TACT82000 was a 3-chip chipset for 80286 motherboards. It was released in December 1988. The three chips were as follows:

TACT82301 - System Unit
TACT82302 - Memory Control Unit
TACT82303 - Peripheral Control Unit

An article from Computer Business Review stated "Texas Instruments is now ready with its three-chip set for building MS-DOS micros, compiled in 1.2 micron CMOS from the Texas ASIC library: the set comprises the TACT82301 system unit, the TACT82303 memory control unit, and the TACT82303 peripheral control unit enabling manufacture an AT-alike motherboard to be designed with just 17 chips; products based around the set can run at up to 16MHz, and a PS/2 Model 30 version will be available soon, with chip sets to clone the Micro Channel Model 50, 60 and 80 machines to be announced shortly."

This chipset is known to have been used on the following systems and motherboards:

  • Olivetti PCS 286


TACT82411 "Snake" Chipset

The TACT82411 is a single-chip AT controller. Designed for up to 33 MHz, it came in either a 3-chip chipset for SX systems or a 4-chip chipset for DX systems. The chipset comprises the TACT83442 Memory Control Unit (MCU), TACT83443 AT Bus Interface Unit (ATU), and TACT83441 Data Path Unit (DPU). It supported both the Weitek 3167 and Intel 80387 math coprocessors.

It can be seen on some Olivetti PCs. An 82S411 was also produced, codenamed "Snake+".

Datasheet (Technology Preview)

TACT83000 "Tiger" Chipset

The TACT83000 was a 386SX and 386DX chipset for systems up to 33 MHz, consisting of the following chips:

For 80386SX (3 chips):

TACT83441 - Data Path Unit (DPU)
TACT83442 - Memory Control Unit (MCU)
TACT83443 - AT Bus Interface Unit (ATU)

For 80386DX, a second DPU chip was needed as each DPU supported a 16-bit data path (the 80386DX had a 32-bit data path width).



TACT84500 Chipset

The TACT84500 was a 486 chipset introduced in 1991. It supported the EISA bus.