>Last night I poked a little around the RA60 and the 11/34A that I want to
>keep. I saw a cable ass'y attached to the RA60 which had two black cables
>(about 7/8"wide x 3/8" thick) and relatively small plastic 8-pin
>connector recepticles within a comparatively hefty backshell. Inside the
>11/34A cabinet there were a group of four of the same small mating
>connectors which had four flat, red cables running from that group into a
>Unibus board in the the BA11 (forgot module number). A 12-foot long cable
>with two 8-pin plastic connectors each within a large backshell was
>laying inside the 11/34A box. I extrapulate from a couple of other
>private msgs that this is probably the UDA50 interface. True?
Sounds good to me...
>Please tell me about this disk I/F. Any FAQ on it somewhere?
RA60 is a removable disk, part of the RA series of MSCP (mas storage
communications protocol) disks... MSCP is a Digital proprietary
protocol, but if you check the uncommented source for the DU handler
on RT-11, you'll find lots of info on how to program it (or at least
you'll have a chance to figure it out -- it's uncommented) Other
members of the family are the RA8x series and the RA9x series...
>Also, I would like to find the same tech info or descriptions on the MSCP
>interface which I understand the RL01s and RL02s have.
MSCP was used for many disks put out by Digital, but not the RL01 or
RL02... these disks are smarter than an RK05, but still required
programming at the cylinder/head/etc level instead of abstract
objects like blocks...
>Looks like a J-11 chip on the CPU board in an 11/23 chassis that was
>buried in the pile (darn little thing was so small compared to the 5000+
>pounds of other boxen that I forgot to mention it in my first msg.)
>That's basically an 11/73 isn't it?
You don't mean an '11/23' chassis... it may be a BA23, or a BA123 (or
a BA-11). If you have a J-11 chip on a board, we'll need to know
more about the board. Is it dual high? (KDJ11-A -- 11/73A). Is it
quad high? (KDJ11-B -- 11/73B or 11/83, KDJ11-D -- 11/53, or KDJ11-E --
11/93). Is there memory on the board? (KDJ11-D or KDJ11-E) Is there
a space for a 40-pin chip? (FP chip, KDJ11-A and KDJ11-B) etc.
Then again, you could tell us the M-number and we could tell you what
it is... :-)
Megan Gentry
Former RT-11 Developer
+--------------------------------+-------------------------------------+
| Megan Gentry, EMT/B, PP-ASEL | Internet (work): gentry_at_zk3.dec.com |
| Unix Support Engineering Group | (home): mbg_at_world.std.com |
| Digital Equipment Corporation | |
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http://world.std.com/~mbg/ |
| Nashua, NH 03062 | "pdp-11 programmer - some assembler |
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+--------------------------------+-------------------------------------+
Received on Tue Jul 07 1998 - 17:19:29 BST