30 Sep
2001
30 Sep
'01
6:48 p.m.
On Sep 30, 22:42, ajp166 wrote:
From: Pete Turnbull <pete(a)dunnington.u-net.com>
>Ah, then you'll know what the difference(s)
was/were. While looking up
>8080A and 8080 (except all my 1976 and 1979 Intel Data Books say is that
>they're functionally and electrically compatible) I discovered that NEC
>made two versions, both called 8080A, but one with some enhancements. I
Ah no, not a V20 thing. The first version of the NEC
8080A was not fully
compatable at the hardware level. It was the interrupt/hold thing.
Makes sense. Timing on the Intel part was a bit tricky, I seem to recall.
Or maybe it just seemed that way to a beginner, at the time :-)
But I just came across (while loooking for something completely different)
a reference to a BCD subtract on the NEC part (or one of them). What was
that about?
--
Pete Peter Turnbull
Network Manager
University of York