31 Jan
2002
31 Jan
'02
1:24 p.m.
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