24 Jan
2008
24 Jan
'08
3:44 p.m.
--- Tony Duell <ard at p850ug1.demon.co.uk> wrote:
HP150-II (it has a CPU configured in minimum mode.
But you can add an
8087 add-on card. Since the minimum mode doesn't
support coprocessors,
the add-on card has an 8088 on it in maximum mode
along with logic to
provide the minimum-mode signals to the rest of the
machine. When that
card is fitted, the 8088 on the mainboard is
disabled).
Hmm just how is it disabled? Someone wanted to add an
8087 to a Peanut, and it made the most sense to plug a
board (w/a *new* 8088) into the old 8088 socket.
The 8088 can go into *offload mode* when it
encounters instructions intended for the 8087, but
that's probably not what you're talking about (at best
that would be considered intermittent *disabling*).
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