Yes please
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Gesendet: Sonntag, 18. Dezember 2016 19:00
An: cctalk at classiccmp.org
Betreff: cctalk Digest, Vol 30, Issue 18
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I was happy to find a IBM XT for a good price at the scrapyard today in
very nice condition. It is missing the hard drive, but i have plenty of
those, the controller was still inside.
I had a little issue getting video working at first, i do not have a 9
pin cga monitor laying around, thankfully i found a 16 bit isa card that
also works in an 8 bit slot.
The machine starts up and runs its memory test, however it gives a 301
error. System halts and says press f1 to continue, but no luck, keyboard
is unresponsive. I have tried about 10 different keyboards on the
machine, including some model M keyboards with a ps2 adapter with no luck.
A quick search does turn up that 301 is a keyboard related error, but i
am not sure what exactly the issue is.
Am i doing something stupid here or am i looking at the possibility of
something being wrong with the machine?
--Devin
I'm not sure if it would make a difference but in your membership options to the list you can choose the format of the messages and how you'd like to receive them. I know my settings are plain text but I haven't played with the others to know if they have an option like that.
The only time I've seen base 64 coded stuff are spam pop-ups trying to bypass plaintext filters. Interesting to hear there's some legitimate usage happening.
-------- Original message --------From: jonas at otter.se Date: 12/2/16 4:45 AM (GMT-06:00) To: cctech at classiccmp.org Subject: Base 64 posts to the list
some list posts have begun appearing in Base 64 format. I read
the list in daily digest mode, and these posts are not converted to
anything sensible
> Jay wrote:
> Speaking of which - I'll put out a call again for if anyone wants to
> get a group purchase on the motor run caps for a TU55/56....
>
I'd be interested in a couple. I could only find some oversized stud-mounted
ones when I refurbed my TU56 and although they're perfectly functional they
don't look too good.
> Anyway, does anyone have experience of rack-mounting a TU56? It clearly
> doesn't go on slide rails, it bolts directly to the rack (hinge down
> the front
> panel for access). I have the manuals from Bitsavers, they imply there
> is some
> kind of spacer block that goes under the TU56. Does anyone know what
> that
> is exactly so I can attempt to make one if it is needed.
>
> -tony
I mounted my TU56 in an H960 recently(ish). The block you mention only acts
as a support while you bolt the TU56 in and isn't needed afterwards. The
TU56 is too heavy to easily support with one hand while you put in a couple
of bolts - the manual advises separating the front panel and reassembli8ng
after mounting but that seems more bother than it's worth. I bolted a piece
of scrap across the H960 to hold the TU56 up while I put the bolts in.
5-minute job.
>
> Date: Fri, 16 Dec 2016 13:12:45 -0600
> From: "Jay West" <jwest at classiccmp.org>
> Subject: RE: Rack-mounting a TU56
>
> Speaking of which - I'll put out a call again for if anyone wants to get a
> group purchase on the motor run caps for a TU55/56....
>
> J
>
Yes please.
--
Michael Thompson
> I remember reading somewhere (it was decades ago, sorry, don't remember
> the source) that AI's paging box was subtly different from the one on
> DM; the AI one could IIRC, address 4 'moby's (a full PDP-10 address
> spare), and two (I think? I'm pretty sure all the KA's had two moby's
> of main memory) were used for the Fabritek 2-moby memory, one was for
> the PDP-6 (so the KA could see into it) and one was for the PDP-11's.
I wasn't able to track down the source of that, but reading ITS sources did
confirm (see SYSTEM;CONFIF >) that the AI paging box had one more bit of
output address than the ones on DM and ML. And the PDP-6 memory appeared at
03000000.
I now recall that later in the AI KA's life, the Fabritek ('Moby') memory got
flaky, and it was replaced with a kludge (done by HIC, according to the ITS
source) which used a number of LISPM memory cards.
> (AI had a number of PDP-11's attached to it - one to drive the Xerox
> Graphic Printer, one to drive the Knight TV system, and I think maybe
> one more, the so-called I/O -11 - or was that on MC, which had two
> -11's - the standard KL front console -11, and I think one more?
So the I/O-11 code (see SYSTEM;IOELEV >) ran on 3 PDP-11's; two on MC (one
was the front console, interfaced through a DTE20, and one an I/O processor
interfaced through a DL10 - this latter one was used to hook up to the CHAOS
network).
The other machine running this code was the so-called "CHAOS-Ether-Gateway"
machine on AI (AI had two other -11's, as above). I had this vague memory that
that machine was there before it was hooked up to either the CHAOS net, or the
(3 Mbit) Ethernet, and it was doign something else, previously - but maybe not
- maybe it was added to give the AI KA access to the CHAOS network?
> From: David Bridgham dab at froghouse.org
> I thought I'd heard that the 10s were connected to the Chaosnet through
> 11s running MINITS.
That would have required building a 10-11 interface for them.. :-)
But if you look in SYSTEM;CONFIF > you can find this:
IFE MCOND MLKA,[
..
DEFOPT CH10P==1 ;CHAOS NET VIA PDP-10 I/O BUS, NOT FRONT-END
and then in SYSTEM;CHAOS >
SUBTTL CH-10 HARDWARE DEFINITIONS
IFN CH10P,[
CHX==470 ;I/O DEVICE NUMBER
;CONI/CONO BITS
So there were PDP-10 I/O bus CHAOS network interfaces. (Although I have
absolutely no, zero, memory of them! :-)
Noel
> From: Paul Koning
> Disassembling the mechanics is quite another matter. The spindle and
> head actuator assemblies are precision mechanisms with very tight
> tolerances and alignment requirements.
Oh, I wouldn't take out anything that would require precision realignment. (I
would certainly carefully read the entire maintenance manual before attempting
to lighten it by removing things.) But some could come out - e.g. if the
spindle drive motor uses a drive belt (many do), that would therefore be safe
to take out. And the power supplies - you might want them out anyway, to
recondition the caps, and check them out. Etc, etc.
Noel
> From: Lars Brinkhoff
> I wonder how the AI PDP-6 was used back in the day. I suppose ITS
> development moved to the KA10 using the virtual memory pager, leaving
> the 6 behind. But it was still attached as a slave CPU, right?
Yes. There is a document, "February 1972 ITS Status Report", AIM-238, which is
>from a point in time when both CPUs were in operation as a dual-CPU system,
with paging on the KA10, and it contains a considerable amount of technical
detail. It is available here:
https://dspace.mit.edu/handle/1721.1/6194
as a scan, and someone has recently OCR'd it, here:
http://its.victor.se/wiki/aim-238
The section you probably find most interesting is "Dual Processors" (pg. 29),
which describes the unified, shared I/O bus.
The earlier "ITS 1.5 Status Manual" might also be interesting; it covers a
point in time when I think they only had a PDP-6.
>> I think all the DM people are still around - why not ask one of them
>> for more?
> I will.
I'd be interested to hear anything about the DM PDP-6 which you find out.
Ideally it would be optimal to load any information into the Computer History
Wiki, but alas, creation of new accounts on that seems to be wedged at the
moment; I'm working on trying to get that solved.
Noel
Van: Ethan Dicks<mailto:ethan.dicks at gmail.com>
Verzonden: vrijdag 16 december 2016 20:43
Aan: General Discussion: On-Topic and Off-Topic Posts<mailto:cctalk at classiccmp.org>
Onderwerp: Re: Rack-mounting a TU56
On Fri, Dec 16, 2016 at 2:12 PM, Jay West <jwest at classiccmp.org> wrote:
> Speaking of which - I'll put out a call again for if anyone wants to get a group purchase on the motor run caps for a TU55/56....
I need a few.
-ethan
I have one TU56. There will come a day that I am up to connect it ?
Until then I don?t know in what shape the run caps are, so I probably
do wise to join in this group buy opportunity ? depending the cost ?
* Henk, PA8PDP
