[HECnet] DU11 vs. DUV11

[Steve Davidson]

-----Original Message-----
From: owner-hecnet at Update.UU.SE 
[mailto:owner-hecnet at Update.UU.SE] On Behalf Of Johnny Billquist
Sent: Sunday, January 06, 2013 15:54
To: hecnet at Update.UU.SE
Cc: John Wilson
Subject: Re: [HECnet] DU11 vs. DUV11

On 2013-01-06 21:47, John Wilson wrote:
I still can't find where it says "8085A" in the 110/130 manual, but 
page
B-3 gives I/O page timings and mentions an "I/O microprocessor" and 
the fact that word I/O takes 90 usec but byte I/O takes 180 
usec.   So 
that certainly explains the difference in the DUV driver.   Plus the 
manual specifically says that RSX11S is available for the 
/110, so I 
guess it was even supported!   Sweet.

Also mentioned on page 4-6, but pretty much with the same 
level of detail. Byte writes cause a read-modify-write. Time 
of 180 usec. And there is an (unmentioned) 8-bit 
microprocessor acting in between the
PDP-11 and any peripherials.

	Johnny

-- 
Johnny Billquist                                   || "I'm on a bus
                                                                    ||   on a psychedelic trip
email: bqt at softjar.se                         ||   Reading murder books
pdp is alive!                                         ||   tryin' to stay hip" - B. Idol


I just found my VT103 LSI-11 Video Terminal User's Guide.

The beast looks like a VT100 but has dual, count them dual, TU58's in
the front and a 4x4 18-bit backplane in the back.   Typical configuration
(slot-wise) is:

1 - LSI-11 Processor
2 - MSV11-DD memory
3 - DJV11-J (4-channel serial line interface)

Or

1 - LSI-11 Processor
2 - MVX11-A memory and serial in/out

The bus slots are numbered from 0-7.

I will look for my PDT documentation a little later.   I am cleaning up
that part of the basement now anyway.

-Steve