On Wednesday 12 April 2006 16:45, Patrick Shanahan wrote:
I believe the 80286 possessed floating point but perhaps it first appeared in the 80186 which was almost unknown. The 8086 and 8088 did not. AFAIK the 80286 and 80386 (mentioned earlier by Carlos E. R.) only had floating point coprocessor (80[23]87) chips, like the 8087 for the 8086 and 8088 CPUs. The 80486DX processor had on-chip floating point, as do all Pentiums, I believe.
The 80186 and 80188 were 16-bit bus and 8-bit bus versions of the 8086 and 8088 that included a few more instructions, plus on-chip DMA and interrupt controllers, counter/timers, and logic to generate chip-select signals that reduced the number of chips needed to build embedded systems. There were a few consumer PC-type products using the 80186/80188, but many embedded computer products. There was also an 80187 FP coprocessor for the 80188/80186. Jim