Inside the Intel 8088 processor’s bus interface state machine @kenshirriff

In 1979, Intel introduced the 8088 microprocessor, a variant of the 16-bit 8086 processor. IBM’s decision to use the 8088 processor in the IBM PC (1981) was a critical point in computer history, leading to the success of the x86 architecture.

The designers of the IBM PC selected the 8088 for multiple reasons, but a key factor was that the 8088 processors’ 8-bit bus was similar to the bus of the 8085 processor. The designers were familiar with the 8085 since they had selected it for the IBM System/23 Datamaster, a now-forgotten desktop computer, making the more-powerful 8088 processor an easy choice for the IBM PC.

Ken Shirriff takes a deep dive into the 8088 leading to documenting the processor bus interface state machine which synchronizes all that happens within the chip.

Check out the full details in the post here.


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