5 May
2001
5 May
'01
8:19 a.m.
AMD did have an Ap note on the 2901's that described
a then fast (I think about 4mhz) version of the 8080.
IDT later made much faster versions of the 2901 and 2910-
in CMOS and they were I recall about twice as fast. 2901's
were used in manu machines including DEC PDP10-KS-10s
(albeit it was the slowest machine in the line)..these days
a nice Virtex or Spartan fpga will fit a whole processor
with up to 1mbit or sram on chip.
----- Original Message -----
From: "ajp166" <ajp166(a)bellatlantic.net>
To: <classiccmp(a)classiccmp.org>
Sent: Friday, May 04, 2001 6:45 PM
Subject: Re: Allison: 2910c version of z80
From: John Ott <jott(a)hamming.ee.nd.edu>
I don't have your email address. So, do you
still have the schematics
of your 2901C version of the z80? Have you done any stack based cpu's
with bit slice chips? (e.g. something to run native forth code on )
john
I do still have them. No, I wont publish the notebook that contains the
collected wisdom. I did this a lot of years ago.
My $.02 2901 was an ok device but slow and turned out to the the
speed limiter. Also the microcode for was a pain! Never did a stack
cpu though the PDP-11 does that very well as is.
Allison