Description:

Overview

This is partially a return to the model 70 type 1 chipset. The 90X8134 DMA has been replaced with a 63F7520(ESD). Speculation: this new chip performs the same function as the old chip.

This chipset can work with either a 486 or a 386DX with a 385 Cache Controller. A daughter-board plugs into the motherboard, with one of these options. Type 3 is 386, Type 4 is 486. It operates at 25MHz.

This chipset includes two Intel 8259-2 (Programmable Interrupt Controllers).

Documented parts

• IBM 57X4111
• IBM 63F7520(ESD)
• IBM 72X8299 (I/O controller)
• Intel 8042AH (Keyboard Controller)
• Motorola MC146818AP (Real-Time Clock + RAM) (known as: Motorola MC146818AC [Real-Time Clock + RAM], Motorola MC146818AL [Real-Time Clock + RAM], Motorola MC146818AF [Real-Time Clock + RAM], Motorola MC146818AFN [Real-Time Clock + RAM], Motorola MC146818AS [Real-Time Clock + RAM])
• VLSI VL82C114 (Combination I/O)