The problem of leakage is certainly not limited to this stuff. Back when
I was making PC boards, I made some boards for a company, and they told
me they were no good. So I took a trip up to their place (very nice
nice, a couple of hundred yards from the Pacific Ocean.) These were high
impedance circuits, and IIRC most didn't work. I had already made *sure*
the boards were clean when they were sent since this was a new customer
and the second time it happend. Some of you already know the answer by
now ... the salty air from the Paficic created the problem.
> Well, one came back to bite me.
> isolated track to the nearby 9V supply to the CX065B chip. I took out a
> few more components to get to the PCB surface, then really cleaned it up.
> And then I was getting over 30M leakage.
>
> Put everything back, and it seems to work....
>
> -tony
Hello Lyle,
I have the following manuals (on paper).
PDP-11 Fortran-77 Documentation Supplement
AA-JQ94A-TK June 1987 Fortran-77 Version 5.2
PDP-11 Fortran-77 Language Reference Manual
AA-V193A-TK July 1983 Fortran-77 V5.0
(I have this one twice, so for postage, it's yours)
PDP-11 Fortran-77/RT-11 User's Guide
AA-BR70A-TC Operating System: RT-11 V5.1
Fortran-77/RT-11 V5.0
(Adapted from PDP-11 Fortran-77/RSX by Multiware, Inc.)
PDP-11 Fortran-77/RT-11 Object Time System Reference Manual
AA-BR71A-TC March 1984
PDP-11 Fortran-77/RT-11 Installation Guide/Release Notes
AA-BR72A-TC March 1984
All together they are a thick orange binder, so if I must scan
please tell me which ones. I will probably split them up in
chapters, because at 600 dpi (256 greylevels) they will be
many Mb's in size.
Funny, I did not even know I had the RT-11 Fortran-77 doc of
Multiware, as recently discussed in a thread!
- Henk, PA8PDP.
________________________________
Van: cctalk-bounces at classiccmp.org namens Lyle Bickley
Verzonden: ma 27-02-2006 03:41
Aan: Al Kossow
CC: General Discussion: On-Topic and Off-Topic Posts
Onderwerp: Re: RT-11, "PDP-11 FORTRAN-77 User Manual"
On Sunday 26 February 2006 18:31, Al Kossow wrote:
> I should have this scanner.
BTW: The name of the manual may be RT-11, "PDP-11 FORTRAN-77 User
Guide" ("Guide" as opposed to "Manual" in my prior email).
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Thank you for your cooperation.
If someone has a copy of the RT-11, "PDP-11 FORTRAN-77 User Manual" I'd like
to borrow it to make a copy (and lend it to Al Kossow to put it up on
bitsavers.org). Version 5.x would be perfect. I'll be glad to pay for
shipping both "ways".
If you have a PDF of the manual that would be even better. Please let me know
where I can download it - or I'll give you a private FTP address to upload
it.
Thanks,
Lyle
--
Lyle Bickley
Bickley Consulting West Inc.
Mountain View, CA
http://bickleywest.com
"Black holes are where God is dividing by zero"
Hi,
Does anyone have a spare copy of the book "P-Source: Inside Apple Pascal"
by Randy Hyde (pub: DATAMOST), or any low-level info on UCSD P-system I.5,
especially the 'Version I' pcode interpreter?
I'm trying to port the UCSD P-System onto my homebrew 6502 computer, but
that's a little difficult without any documentation on the P-code interpreter
itself.
Ordinarily I'd just buy a copy of the book off Amazon, but ?65 plus P&P
with a six-week wait for delivery is downright outrageous...
Thanks.
--
Phil. | Kitsune: Acorn RiscPC SA202 64M+6G ViewFinder
philpem at dsl.pipex.com | Cheetah: Athlon64 3200+ A8VDeluxeV2 512M+100G
http://www.philpem.me.uk/ | Tiger: Toshiba SatPro4600 Celeron700 256M+40G
Advertisement # 5869045519
The title is "1st Palm Computer" ... the item is a Psion Organiser II.
I understand that no one will dig like I have about the history of handhelds
... but geez, the only research this doofus had to do is to read the big
letters on the cover of the instruction manual ... Where it says "II" as in
"not the first." :)
I kindly pointed this out in a message to the seller (sans the "doofus"
part.) The seller's reply tonight was "Get a life!!"
Darwin must've missed that house.
-----------------------------------------
Evan Koblentz's personal homepage: http://www.snarc.net
Computer Collector Newsletter:
>> http://news.computercollector.com
Mid-Atlantic Retro Computing Hobbyists & Museum:
>> http://www.marchclub.org
>> http://groups.yahoo.com/group/midatlanticretro/
A couple of days ago I mentioned I'd discovered a workaround for Epson
SD320 or SD321 spindle motors that stopped after a few seconds because
the protection circuit was tripping...
Well, one came back to bite me.
I spend the afternoon looking at the other drive in the TF20. I'd changed
the resistor I mentioened and put the motor back in place. Hooked it up
to the bench supply, and would you beleive it stopped after a few seconds.
So out it came again. The bare motor stopped after a few seconds too, and
the protection cicrcuit was certainly being triggered (the base of Q33
was at about 0.6V). I noticed a leaky electrolytic, so I changed that, no
improbement.
So I decided to totally disable the protection circuit by removing the
300k feed resistor. You guessed it, the darn thing still triggered, there
was still 0.6V on the base of Q33. All that's connected to that point are
a resistor to ground (the one I'd reduced to 56k), a capacitor to ground,
and the base itself. I removed all 3 components. OK, the mtoor now ran
(so the rpoblem was in the protection circuit). And there was nearly 9V
on the base connection for the transistor -- a point that had noting
connected to it.
You guessed it. some of the gunge from the faulty capacitor was causing
electrical leakage on the PCB. I could read 100k of resistance from the
isolated track to the nearby 9V supply to the CX065B chip. I took out a
few more components to get to the PCB surface, then really cleaned it up.
And then I was getting over 30M leakage.
Put everything back, and it seems to work....
-tony
are these at this point in time still any good for
procuring puter gear of a vintage nature? I used to
see loads of stuph out on Lawnguylind (when it wadnt
all that interesting) at these events. Ham dudes are
real packrats. Now it doesnt have to be a whole systen
necessarily. Sometimes components - monitors, video
cards, whatever - could be just as groovy.
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