Chuck said:
> Well, the 24v is used primarily for the head positioner and the head-
> load solenoid, so its voltage isn't terribly critical.
This is good to know. I admit, I haven't gone through the RX01 logic
PCB schematics. You've saved me some trouble. Thanks.
> If you want to feel secure with a regulated voltage, try putting
> something like a 7824KC or 78H24 (2A, 24v) TO-3 regulator. But if
> your RX01 has lasted this long without, it's probably not important.
Yes. I'm probably not worried enough to do this. Like you said, if this
30-year old system has survived all these years so far, it's probably
going to be okay (unlike an RD53 that just failed on me, but that's
another story....).
- Jared
> IIRC, the 'raw DC' is unregulated, just rectified and smoothed from the
> transformer. As is the 24V line. Both are about 1.7* what they should be.
That's the strange thing to me. The two secondaries from the transformer (one
for the 24V line, and the other for the 10V line [which sources the regulated
5V output]) are 'proper' at 27.8V and 11.2V, respectively. What I don't understand is how a 24V line can suddenly produce 42V! It's like something
is 'pumping' the circuit, and I admit I have never studied how such things work.
The funny thing is that the 5V regulation is working, even with 17V input
instead of 10V.
> It's gettign late, so I'll not find the prints tonight. But IIRC, the
> transformer in this supply is a ferroresonant one, and that's what
> stabilises the 'raw' and 24V lines. What happens if the capacitor hung
> off that is defective?
Fair point, but can a faulty capacitor 'pump' up the voltage like I'm seeing?
> I suspect the last part is very ture. Actually replacing the faulty part
> is the easy bit :-)
Hey, thanks for your confidence! :-) I can use a little outside support! ;-)
Let me add that this RX01 is the second of two RX01 units in this system.
When I went through the first one a week ago, it checked out fine...that is
I saw 25V/10.2v on the outputs, without a load.
And you're not going to like this :-), but for an electronics novice, tonight I
followed my instinct and swapped the regulator PCBs between units.
Yup, the 'good' system's PCB now is putting out 42V and 17V! So, it's not
the regulation circuit, I guess, or any component on the two system's PCBs.
But after swapping the PS regulator PCBs, all that's left are the transformer (which appears to be putting out 'expected' voltages), a 660V AC capacitor thingy (which I obviously don't understand...is it part of the ferrroresonance?) that only connects back to the transformer itself, and the two smoothing caps (one for the 24V line and one for the 10V line). Is it possible that one/both
caps are 'pumping' the circuit? <shrug> I'm just too novice to know.
Another suggestion I received privately hints that putting a dummy load
on the PS might bring it into line, and that I will try. I have access to an
oscilloscope, and will put it on the thing, too, to see if I can discover
anything strange.
Thanks,
Jared
IBM Turbo 16/4 Token-Ring PC Card 2 no lead
IBM Turbo 16/4 Token-Ring PC Card no lead
Toshiba V34 FAX Class II PCMCIA with lead
Available for postage from UK
Lee.
> which is sqrt(2) times as large. sqrt(2)+27.8 is about 40V. Hmmm... Are
> you sure those secondary voltages are reasoable?
I think so. The printset doesn't seem to specify the transformer's secondary voltages, but reviewing my historical notes from other RX0? revivals, the 'normal' voltages are roughly 24 and 10.
> voltage increases. But I could well believe a reasonably designed
> regualtor would work correctly on double the input voltage, particularly
> on no load.
It appears that the DEC designer did his/her job well, then, on this particular PS! :)
> > Another suggestion I received privately hints that putting a dummy load
> > on the PS might bring it into line, and that I will try. I have access to an
> Thing is, you havve an identical PSU that works without a dummy load (as,
> BTW, do the ones in my RX01s and RX02s). I don't think you need a load on
> this supply/
Point taken, but after swapping the 660v AC cap between the units this afternoon, and seeing no difference. The only real thing left is the transformer, but I can test it's output directly, and it's at the 'normal' levels.
So, I guess it's a 'dynamic' issue, rather than a static one. Maybe the load does matter. I'm going to try that next.
- Jared
So I can come along sit down and start knocking out some code then?
That might cause a crowd to collect. Then something dynamic.
Line printers thumping away, Paper tape reader on a long loop.
Tape punch doing a Woody Woodpecker. IBM 029 doing verify.
Two security guys dragging me out of the building.
The visitors would love that!!
Rod
-----Original Message-----
From: cctech-bounces at classiccmp.org
[mailto:cctech-bounces at classiccmp.org] On Behalf Of Jules Richardson
Sent: 03 September 2007 18:14
To: On-Topic and Off-Topic Posts
Subject: Re: British Computers.
Rod Smallwood wrote:
[BP stuff]
> Well that's interesting....
> How much of it will be running?
Well the aim is for as much as possible; I suspect we can manage 95% for
the machines actually set up on display, but then there'll probably be
other things on shelves or incomplete so that people can see their
internals etc.
Not 95% at once, of course - but 95% capable of running whenever the
relevant people who know how to operate and look after them are on site
:-)
Hi,
Is there any interest in reverse engineering the
MatchPoint PC card? I have one the cards and it
appears fairly simple. It is mostly a small number of
74LSXX TTL chips and buffers. There are a small
number of PALs on the board which pose the biggest
challenge, I think.
An open sourced version of the MatchPoint PC card
design would be a powerful tool for those of us
interested in making disk images of legacy CP/M hard
and soft sector formats. Of course, it would imply
some software being written as well to be useful
outside of just the Uniform PC software which comes
with it.
Is reverse engineering the MatchPoint PC feasible
and/or worthwhile? It might be slightly cheaper than
a Catweasel but I doubt it would be as useful or
flexible. I think the Catweasel ISA is probably a
better deal but they can be hard to get.
Are any of the original MicroSolutions MatchPoint PC
designers still around? Does anyone own the
MatchPoint PC IP or is it now officially
"abandonware"?
I would like to hear people's thoughts on the topic.
Thanks!
Andrew Lynch
>> On 9/3/07, Chris M <chrism3667 at yahoo.com> wrote:
>> There are 1 of these on eBay:
>>
>>
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=140152462361&ssPage…
>>
>> I want!
>>
>> Oh, it's in Oklahoma. It's got to weight >150lbs,
>> no?
FWIW I believe the 5362 is a sublime machine. The machine architecture and
operating system are totally unlike the VMS/UNIX stuff many of us are used
to. The mainframe derived, yet somehow unique approach is weird and
wonderful... Even a familiarity with its descendant AS/400 won't quite give
the same thing. Just for example, the system runs in 8 bit
compartmentalised process spaces. The processors are 8 bit, but the
machines often have as much as 2 MB on them. So they've taken the concept
of memory windowing to something of an extreme. You can't program outside
the 64 MB RAM bounds without invoking a separate program in another memory
space. On the other hand, you have have as many applications running in
either shared or single instance mode as you have memory for. As a second
'for instance', there are actually 2 CPUs. One is more or less equivalent
to a channel controller in that it does all the IO. Truly, this is a
machine worth having. There has never been an emulator written to reflect
this architecture, so the only way you can really experience it is first
hand. Add to that the library/directory/file data storage paradym,
RPG/Basic/Cobol/Assembler as the programming languages, and an extensive
menu/terminal IO driven interface and you have something as un-cshell like
as I can imagine in a machine you are ever likely to actually possess.
Compared to this a PDP/11 running RT-11 (or the like) feels a pimped
version of CP/M. IMHOP: zzzzzzzzzzzzzzzzzzzzzzzzzz.... (I'm already ducking
my head for fear of the flaming retribution of the DEC collectors on the
list)
--- Jason T <silent700 at gmail.com> wrote:
> Before I forget, and as I'm sure most already know,
> someone's been trying to give away a 5360 on
> marketplace.vintage.org for sometime. I don't feel
> like logging in, so I can't "see everything", so I
> don't know if it's still available, but I imagine it
> would be.
> I bet Sridhar already has one, so you won't have to
> fight him for it LOL LOL LOL.
> Can't remember where it was located, I want to say
> Connecticut, but I could very well be wrong.
Now I just happen to be the poor sap with this thundering albatross. After
making my pitch, and singing the platforms virtues let me ask, nee plead
for a new keeper to step foward. Here is the revised 'scoop'. I haven't
laid eyes on this system in at least 5 years. It's stored in a ground level
lock-up (garage door style) outside Hartford. I will give a copy of the
key to ANYONE who will relieve me of the storage rental. But that's ALL I
can give you. Over the years I have indeed tried to give away this system
to a number of well intentioned people. The problem is they always want me
help transport it. Well my ability to 'help' has descended from the
sublime to the ridiculous. I no longer living in the area (by which I mean
I live 4000 miles away in England and can be of no imaginable assistance at
all). Tempted? Drop me a mailing address and I will eagerly post you a
copy of the padlock key. From there... over to you. Do your best to
collect it (all of it, please). You MUST have (1) a forklift (2) a tail
lift (3) a team of oxen (a fraternity pledge class would be ideal). The
photo published on 'marketplace' is of the actual machine, just before I
moved it. The 'vette' in the background should give you a clear idea of
scale. Go on, I know you want to. Sridhar's no threat to your acquisition.
He wisely turned me down so long ago I imagine he's forgotten about it
altogether.
Thanks,
Colin Eby
Chuck wrote:
> On 3 Sep 2007 at 19:59, der Mouse wrote:
>> MCM2016HN70 / HID8625
>> CY7C409A-25PC / USA9225 91714
>> GAL16V8A / 15LP / L218D16
>> MC14034B / CP QQ8318
> In no particular order, the MC14304B is a 4000-series CMOS quad "NOR"
> latch. The MCM2016 is a generic 2Kx8 SRAM, the CY7C409A is a 64x9
> FIFO,
> the GAL16V8A is a CMOS PLD (64x32 arry, registered outputs).
> The others are a bit of a mystery to me.
"The others" are speed ranges (15ns) and date codes
>from the 80's and 90's :-).
Tim.
>> Is there anyone who can help me? I am needing an 8" boot disc of
>> suitable software, to breathe life into my 16B monster! I can't
>> believe there is no 8" disk's available? I have made a
>> suitable cable to connect a 5,25 drive, so any suitable software will
>> do, please contact me if you think you can help. regards paul
>
> Kelly Leavitt has a set of 16B/6000 Xenix disk images posted at:
> www.catcorner.org/Tandy
> www.catcorner.org/Xenix
>
> If you dig up a copy of TRSDOS16 (TRSDOS ported to the 68k) I'd love
> to have an copy of the image for my archive.
>
> Dave
Although pretty slow at doing so, I have most of the operating systems that ran on this series of computers either archived in imagedisk format, or ready to be made so.
I have TRS-DOS 16, II, and a lot of different CP/M versions that I can image. And Dave, you and anyone else doing so, are welcome to either link or make a copy of my images available for download in your archives. A little acknowledgement would be nice, but not required.
Kelly
There are 1 of these on eBay:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=140152462361&ssPage…
IIRC would go hand in hand w/the terminal/controller
thing someone had for sale on here in the last couple
of weeks.
the 5364 looks cool. Needs a 5170 - no more, no less -
for the front end. Even looks like an AT.
Not enough krazee Big Blue stuph floating around if my
opinion means anything.
IINM, I spoke to a gentleman - YO DUDE! ;) - who was
working on a "System/36 on a chip". Just way too
groovy.
Stupid Cat's final bid didn't even break 8 bills :(
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