28 Oct
2000
28 Oct
'00
8:43 a.m.
Well, I checked my 1980 National Semi MCS-48 data book and found not only
that there was no 8154, but that the 8155 and 8156 were not listed (yet)
either. They did make them, however, because I have them (INS8155,56) among
my parts.
There's apparently a gap in my literature, but I have no later embedded or
microcontroller books that list the MCS-48 product line. I doubt the part
would appear together with products coming from device families intended to
replace the MCS-48. It must have lived iwithin a fairly narrow window.
NEC and a few others made the 8155 and '56, so they might have made a
version of the 8154 as well.
Dick
----- Original Message -----
From: Tony Duell <ard(a)p850ug1.demon.co.uk>
To: <classiccmp(a)classiccmp.org>
Sent: Saturday, October 28, 2000 2:02 PM
Subject: Re: INS8154 used in Cytospin
>
> I'll look later for the INS8154, but the Intel 8155 and 8156 were both
RAMs
> with 16 bits of I/O controllable on a bitwise
basis like the bits in a
6821
. . . Could
one of those work?
Well, certainly not directly (i.e. it's not plug-n-play). The 8154 had a
few features that I've seen on no other chip (like the addresses to
set/clear individual bits).
The 8154 also (IIRC) has separate address and data lines on the
microprocessor bus side. Doesn't the 8155 have a multiplexed bus to link
to an 8085 (or similar)?
You could probably redesign the instrument to use an 8155 (or an 8156,
AFAIK the only difference between these is the polarity of the chip
select input), but it would be a redesign. And maybe not a simple one.
-tony