Admin: I take it that this is phishing spam. Just not used to seeing
it on cctalk.
--Chuck
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Subject: Scheduled Maintenance & Upgrade
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Anyone has the operation and service manual for the 9-track mag tape drive
Overland Data OD3201? Similar to a Qualstar, but seems
larger-faster-quieter-better. Just succeeded putting it online. This one is
unusual in its simplicity - it has both a Pertec and a Parallel Port
interface. Once I found the DOS software in a dark corner of the Internet, I
connected it to the parallel port of a my vintage DOS machine and it worked
straight out of the box. Look Ma, no interface cards needed!
Reads and writes fine apparently. But it has the common ailment of servo
motor tape drives, it creeps a little bit at rest. So I probably need to
adjust a pot somewhere. Would be nice if I could find the service manual,
but no luck on Googling it up.
Marc
Hi,
This recent Quora answer contained a little gap - the name of the person
who designed the original logo on the case.
Quick Googling didn't help. Anyone have the trivia answer?
http://qr.ae/RP2GQy
Any other PIC/Pixar/Renderman anecdotes welcome. Sounds like a pretty
fancy bit of hardware for the time.
--Toby
> From: Jim S
> I suspect I also need an additional card at minimum for my escapade,
> and I'm not sure if one card will do it.
> I've got pretty much one of every 2 size processor and the 11/03 4 up
> processor card. I also have several serial cards, and some memory.
Then you should have all you need to run a minimal system; CPU, memory and a
serial interface for the console. (In fact, it's possible to run _very_ short
programs with only an 11/23 or /73 CPU card, a serial interface card, and no
memory - put the program in the PAR's! :-)
> if someone has something laying around that would let me just run up to
> a working serial port
Do you mean, a cable? If so, I can hook you up there (not the most robust,
mind, as my supply of pins/shells are cheapo knock-offs, but functional).
What kind of serial card(s) do you have (some take the LSI-11 serial
'standard' 10-pin Berg connector shell, the early ones use the DL11
compatible 40-pin shell), and what's going to be on the non-PDP-11 end
- a PC of some sort?
Noel
>> From: Tony Duell
>> I am working from 2 Printsets, both from Bitsavers. One is the GT40 one
>> (yet another backplane of course, but the same CPU, core memory, etc).
> Ah, thanks for that pointer; I'll see if it shows the same board
> versions as my 'early' hardcopy set.
It does seem to show _basically_ the same as my set; the print revs are
slightly different (slightly later), but it does have what I've called the
'early' boards. The differences with mine are minor - e.g. on the M7261,
there are two extra capacitors in the prints in the GT40 set.
> isn't the switchable divider only present on later boards (the early
> ones being pretty much 110 baud only)?
Ooh, right you are - another way to tell the early M7260 from later ones. If
your memory of a version with a crystal is correct, that does indeed make
three versions of that board. Can all -11/05 and -11/10 owners look at their
M7260, and see if they have one with a crystal? If so, we can institute a
search for the prints of that version.
> This printset _does_ show the jumpers I mentioned. Look at page 75 of
> the .pdf bottom, left-ish. Jumper W1 is described as disabling the
> internal serial port when fitted.
Ah, right you are; maybe I am mis-remembering a long search through the
'early' printset for jumper W1?
>> You have to tweak the trim pot to change from the 110/220/440/880/1760
>> speed set to the 150/300/600/1200/2400! Ugly!!)
> May be easier than finding the right crystal to change a DL11A-E to the
> 'other' set of baud rates :-)
Well, today that's not so easy (although I did stumble on a pair of the 9600
baud crystals on eBay a while back), but back then, it was a lot easier!
> The M9302 includes logic to assert SACK if a grant (any BG or NPG) gets
> to it ... This causes problems with an open grant chain in that the CPU
> sees the SACK, tries to deassert the grant (which it hasn't asserted in
> the first place) and the bus is locked with SACK asserted and no grants.
So, how did the M9302 see a 'grant' to start the whole process? Noise on an
open input? Or maybe it powers up in that state?
>> From: Johnny Billquist
>> You most likely want to terminate the other end as well.
> It may not be a perfect electrical match, but if all you have is the
> CPU backplane .. I am certain a terminator at the CPU end only will get
> the machine doing something
Yes, I think that in electrical terms it would be very similar to the typical
LSI-11, which works fine with termination at one end only. Yes, there will be
more noise on the bus due to the un-terminated end, but it will probably
still work OK.
Noel
Chuck,
Thanks for your STP2T02.exe SCSI tape to SIMH program. Ran like a champ
under Win98 DOS, first time. It's the only utility that did work out of the
box to read a tape from my SCSI-1 HP 88780 9-track into a SIMH file, out of
the 5 or so I tried. Before I jump to Linux, which seems to be the more
straightforward option, does anyone have the reverse tool to write a SIMH
image file on a 9 Track tape under Windows/DOS? None of the utilities I
found using Windows Tape APIs could deal with my tape SCSI-1 early
interface, they all expect some basic (SCSI-2?) functions that are not
implemented.
Marc
> From: Tony Duell
> I am working from 2 Printsets, both from Bitsavers. One is the GT40 one
> (yet another backplane of course, but the same CPU, core memory, etc).
Ah, thanks for that pointer; I'll see if it shows the same board versions as
my 'early' hardcopy set.
> The other is the 11/05S schematic, which shows the later boards with
> the crystal UART clock
Say what? The "11/05S schematic" from Bitsavers shows the RC clock; look on
page 61, bottom left corner, there's an RC circuit (and a couple of flops)
producing an output "DPH TTY CLK (I) H", which is fed into the baud rate
divider in the upper left corner.
(Ooooh, what an ugly circuit! You have to tweak the trim pot to change from
the 110/220/440/880/1760 speed set to the 150/300/600/1200/2400! Ugly!!)
Noel
I've been gathering bits and pieces from recent Ebay purchases and would
like to see if anyone has a spare 11/03 or 11/23 qbus type box.
I've got quite a few cards, and even a backplane block, but the prices
on ebay are crazy, and I'd like to check here before doing anything rash.
I suspect I also need an additional card at minimum for my escapade, and
I'm not sure if one card will do it.
I've got pretty much one of every 2 size processor and the 11/03 4 up
processor card. I also have several serial cards, and some memory.
that's as far as I have it, and if someone has something laying around
that would let me just run up to a working serial port I would think
that would be a good start.
I do have a few fully working larger 11's but they are of no use for
this exercise, all are unibus, or not compatible with these cards.
If the price isn't too shocking I'd like to buy if possible.
thanks
Jim
> From: Tony Duell
> There are at least 2 versions of the 11/10 CPU boards. The later one,
> which I thought was the 11/10S, has soldered wire links to disable the
> arbiter ... I think another link disables the built-in console port.
> And didn't it use a crystal rather than RC clock for the built-in
> serial console port?
It would be good to know exactly how many there are! I think there are at
least three, because:
There are two sets of 11/05 (let's not bother with the 05-10 distinction, I
think that's just the artwork on the front panel) prints on-line,
"1105_RevAH_Engineering_Drawings_Jul76":
http://bitsavers.org/pdf/dec/pdp11/1105/1105_RevAH_Engineering_Drawings_Jul…
and "1105S_Schem":
http://bitsavers.org/pdf/dec/pdp11/1105/1105S_Schem.pdf
Both of them show the exact same board revs:
M7260 Rev C (drawing: date 1-22-73, rev N)
M7261 Rec F (drawing: date 9-5-73, rev U)
However, I don't think they show the W1 jumper to disable the onboard serial
line, etc (I spent quite a while looking for it in these prints, after hearing
of its existence :-); and they definitely show an RC circuit, and not a
crystal, as the baud rate generator.
So, the board set with those features (jumper + crystal) must be a later set
than the ones shown in those two on-line sets of prints. (One of which is
marked "11/05S", just to be confusing - I didn't check to see if that rev of
the cards has a jumper to allow another machine to be bus master.)
However, I have a set of hardcopy 11/05 prints, and they show an even earlier
state:
M7260 Rev B (drawing: date 4-07-72 rev H)
M7261 Rev C (drawing: date 3-19-72 rev J)
On this rev of the M7260, the UART chip is down near the contact fingers, and
'horizontal', not up near the Berg connector to the console, and 'vertical'.
The M7261 is also quite distinct; there's a big gap on the center left of the
card (full of traces). Just to thicken the plot a bit more, I have an M7261
that looks like that, and it is marked "M7261E" in the etch!
So that's '3 versions' at least of the 11/05:
- The latest (jumpers and crystal)
- The middle (in the on-line prints)
- The early (in the hardcopy prints I have)
I say '3' because it's possible there are only early and late versions of
each card, and the '3 versions' I listed are actually 3 different mixes of
old/new cards.
> The original and later boards seem to have the same numbers.
Indeed; there's nothing on the handles, etc to indicate that they are
totally different boards (except for that "M7261E" in the etch.
Any chance you can find a print set that shows the later cards, with the
jumpers, crystal, etc?
Noel
I am fiddling with diskettes on my PDP-8/e. I booted COS-310 V8 and it
asked for a date. I tried lots of date combinations, and none were accepted.
Is this because I don't have an LTC installed?
COS MONITOR V 8.00
DATE?
.
ERROR IN COMMAND
.DA 10/04/74
BAD DATE
COS MONITOR V 8.00
DATE?
.DA 1/25/72
BAD DATE
--
Michael Thompson
