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80186 Was not IBM PC compatible. It had e.g. a PIC, DMA and timer built-in, and these were incompatible with the chips in a 8086 based IBM PC. There were a fe
by hyperman1 21d ago
80186 Was not IBM PC compatible. It had e.g. a PIC, DMA and timer built-in, and these were incompatible with the chips in a 8086 based IBM PC.
There were a few new instructions, too, mostly closing holes. You could left or right shift with a constant, while the 8086 had only 1 or the CX register. I think mul also gained a constant.
The fact that Intel released a CPU that could not be put in a PC probably indicates how low they estimated the survivability of the PC.
- icedchai 21d agoThere were "PC compatibles" that used it, like the Tandy 2000. You are correct in that they may not have been entirely compatible, but they did exist.
- hyperman1 20d agoI had a tandy of that era, with i think 64K ram. The incompatibilities were big enough that almost nothing could run.