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80186 is often forgotten to have existed because it didn't see much success in the market / because IBM skipped it and went with 80286 for the AT, but it did ex
by dpq 20d ago
80186 is often forgotten to have existed because it didn't see much success in the market / because IBM skipped it and went with 80286 for the AT, but it did exist.
- vlovich123 20d agoThe 80186 didn’t really introduce anything new architecturally. It’s basically an 8086 with a few more chips bundled on-die. 80286 however introduced protected mode, expanded the address size to 24 bit, hardware enforce memory protection, multitasking, etc.
- pkaye 20d agoI believe 80186 was for embedded systems.
- librasteve 20d agonope
- hyperman1 20d ago80186 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 20d 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 19d agoI had a tandy of that era, with i think 64K ram. The incompatibilities were big enough that almost nothing could run.