Subject: Re: Slightly Off-Topic...
To: None <,>
From: Ross Harvey <>
List: port-alpha
Date: 06/25/2001 17:20:06
> From: Matthew Jacob <>
> On Mon, 25 Jun 2001, Vance Dereksen wrote:
> >
> > But the first VAXen weren't microprocceor based.
> >
> > Peace...  Sridhar
> >
> 2901 based, IIRC.

Nope. The first VAX was the 11/780, it was purely TTL, and it really did
use the 74S181 as its ALU slice.

(For no good reason other than having fun, I wrote a bunch of vax microcode
once. I had to spend a certain amount of time looking at the schematics.
In the true vax "printf is an opcode" fashion, I wrote a frame-buffer-scroll
(bitblt) instruction, as well as some alternate procedure entry and exit

// ross