24 Jan
2007
24 Jan
'07
6:17 a.m.
Ross Tucker wrote:
Hello all-
I'm a n00b on this list, so please forgive me my sins as I forgive
those who.... uh, never mind. Anyway, I am looking to get a "PDP-11
Processor Handbook" from Amazon or eBay (so I can understand the Lions
book) and there are so many different editions and versions... Lions
writes about the 11/40, but supposedly, that's not too different from
the /45 or /70. My simh boot images for v6 are for the /45 (though
supposedly I'm supposed to be able to modify them to run on the
others, right?).
There are a number of differences between the /40 & /45 and /70:
* 45 & 70 are split I & D machines
* /40 has it own floating point that is incompatible with any others
* 11/34 is basically an 11/40 (but can have the compatible floating
point)
* 70 has a Unibus map that allows it to have > 128KW (256KB).
* 45 & 70 have user/supervisor/kernel mode while others just have
user/kernel mode
* there are a few other differences that escape me at the moment
What I'm asking is your advice on which Handbook
to buy. Here is a
synopsis on the editions and prices from amazon:
/04/34A/44/60/70 (1979) $10
/04/34/45/55/60 (1978) $40
/70 (1975) $16
/04, 24, 34A, 70 (Jun 1981) $16
/04/05/10/35/40/45 (1975) $45
If you're trying to understand Lyons, then I'd probably go with the
last
book as the /40 & /45 were the ones most likely to be running v6
originally (although I did run it on a /34 back in the day).
--
TTFN - Guy