Brent Reynolds <[EMAIL PROTECTED]> writes:
>HI, Guys, You can not physically plug an 8086 CPU into a socket made for
>the 8088 CPU. The 8086 is physically longer than the 8088, so the pin-outs
>are most definitely not compatible. You could boost the speed of an XT
Actually, both chips are the same size; both are 40-pin DIPs. You *could*
physically insert an 8086 into an 8088 socket, or vice versa. It just
wouldn't *work*.
The 8088 and 8086 used the same set of pins for the memory address bus,
the I/O address bus, *and* the data bus -- a clever piece of multiplexing.
On the 8086, the lowest 16 bits of the address bus (A0-A15) doubled as
data lines (D0-D15); on the 8088, only the lower 8 bits (A0-A7) were so
used. And IIRC, the *top* four bits (A16-A19) were also used for something
else entirely -- IRQ level, perhaps, but I could be mistaken. (No longer
have my PC schematic, sorry....)
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