On January 31, John Allain wrote:
> I am thinking of getting a hacked LSI-11
> machine that somebody has. It has the chip
> in it and an 18 bit bus (he thinks). Is it
> then an '03, because of the smaller bus, or
> is there some other criteron?
> I tried two related DEC books (Microcomputer
> Processors, Micro/PDP Handbook), one book is
> 16 bit, the other 22, nothing on 18 so perhaps
> my source is wrong?
Nono...The 11/23 does 22-bit addressing, except for the very early
revs of the KDF11-A board on which only 18 address lines were used.
The 11/03 has 16 bit addressing only.
When you say "the chip"...what chip are you talking about? If it
has a 40-pin DIP with two square chip carriers on it, that's an
F11...making it a pdp11/23. If it has a row of "ordinary" 40-pin
chips, then it's a pdp11/03.
Let us know what you find...
-Dave
--
Dave McGuire
St. Petersburg, FL "Less talk. More synthohol." --Lt. Worf
Received on Thu Jan 31 2002 - 21:24:09 GMT