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_at_p850ug1.demon.co.uk>
To: <classiccmp_at_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
>
>
Received on Sat Oct 28 2000 - 15:43:33 BST