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_at_bellatlantic.net>
To: <classiccmp_at_classiccmp.org>
Sent: Friday, May 04, 2001 6:45 PM
Subject: Re: Allison: 2910c version of z80
> From: John Ott <jott_at_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
>
Received on Sat May 05 2001 - 12:19:53 BST