10 Nov
2000
10 Nov
'00
6:31 p.m.
From: Douglas Quebbeman <dhquebbeman(a)theestopinalgroup.com>
> An 80_1_86? Really. I guess I was never aware
that there was one
like
> that ever made. I always thought they jumped from
the 8086 to the
80286
CPU.
Do you have any stats on this little baby?
Same as the 8086/8086 except:
slight difference in PUSHF & POPF
has ENTER and LEAVE instructions
Anyone else remember anything else?
Extended set of IO instructions as well. (V20 had
instruction set differences but, they were different!)
The major difference was the presence of on chip
colock gen, DMA controller (non 8237 compatable),
interrupt logic (not totally 8259 compatable). As a result
any PC made with it was a bit different. Fast parts went
to 12mhz and were also developed in CMOS.
The 186 was 16bit wide bus like 8086 and 188 was like
the 8088 with 8bit busses.
The embedded controller market liked it.
Allison