All:
I have a CompuPro/Godbout RAM14 (16kx8) board, arranged in 4 banks
of 4k starting at 0. I ran a memory test program on it and it shows address
0x3000 as failing; when you look at data written, it appears that BIT 0 is
bad.
So, I ordered some 2147 chips from JDR and swapped the bad chip. It
still fails the same bit. So, I swapped it with another chip in the row, and
it fails again. It passes at address 1000 and 2000, so it can't be an
address bit buffer chip.
Any ideas? Where should I look next?
Thanks.
Rich
Rich Cini
Collector of classic computers
Build Master for the Altair32 Emulation Project
Web site: http://highgate.comm.sfu.ca/~rcini/classiccmp/
/************************************************************/
Hi All,
I have a PDP-11/05 (11/10) in a 5.25" box version which I'm putting
together. It's going to be equipped with 8Kb of core and a RX02
floppy interface. When powering up, led's come on, but there is not
much action to get. Look like the -15V of the PSU is not working
properly.
The PSU is a different one compared to the well known bricks used
in BA11 boxes. This one delivers +5V, +15V and -15V and is labelled 5409728.
Anybody have a schematic of this PSU by any chance?
Thanks,
Ed
>Now I'm not an expert on these, indeed I know nothing at all about apples,
>but these look pretty weird to me - are they actually what they say they
>are, and really common? eBay item 5219329581 (expensive as usual, so no
>bids) for three linotype boxes, one of which has a disc drive with an apple
>logo on it. (Listing has some larger pics linked from it).
I don't think they are Apple's. Linotype made printing presses didn't
they (still do?). Could these be interfaces for said printing presses.
Early DTP type stuff. Maybe one was specifically retrofitted with an
Apple Disk II drive for loading Apple files onto the press system.
-chris
<http://www.mythtech.net>
Hi,
does anyone have the service manual for the Facit 4001 paper tape reader
in electronic form? It's a dielectric reader with a speed of 1,000
chars/sec.
Christian
>
>Subject: Weird S100 memory board problem
> From: "Richard A. Cini" <rcini at optonline.net>
> Date: Fri, 22 Jul 2005 22:57:54 -0400
> To: CCTalk <cctalk at classiccmp.org>
>
>All:
>
> I have a CompuPro/Godbout RAM14 (16kx8) board, arranged in 4 banks
>of 4k starting at 0. I ran a memory test program on it and it shows address
>0x3000 as failing; when you look at data written, it appears that BIT 0 is
>bad.
>
> So, I ordered some 2147 chips from JDR and swapped the bad chip. It
>still fails the same bit. So, I swapped it with another chip in the row, and
>it fails again. It passes at address 1000 and 2000, so it can't be an
>address bit buffer chip.
>
> Any ideas? Where should I look next?
Sounds like a data buffer problem either in the data in lines or
data out lines. Or it could be the data in or out line for that
bit is bad to the chip (socket or open trace).
Allison
Allison
Hi folks,
Does anyone know of a way to repair IC pins that have been broken off at
the point where they leave the IC casing? I've got a couple of chips with
missing pins here and was just wondering if it was possible...
Thanks.
--
Phil. | Acorn Risc PC600 Mk3, SA202, 64MB, 6GB,
philpem at philpem.me.uk | ViewFinder, 10BaseT Ethernet, 2-slice,
http://www.philpem.me.uk/ | 48xCD, ARCINv6c IDE, SCSI
... Anything not nailed down is a cat's toy
>> -----Original Message-----
>> James wrote...
>> I worked for Pr1me for a few years. I rather like PRIMOS.
>
> Ya know, I gotta say of all the OS's I've worked on, PRIMOS
> was one of my favorites. Love that OS!
>
> I still have a well used System Subroutines Reference Manual,
> a PR1ME 50-series technical manual, and a few others. I guess
> I'm saving them on the offhand chance that someday I'll
> acquire a running PR1ME system :>
>
> James - did you know people in the St. Louis Pr1me office?
> The folks I knew were Rose Huber, Bob Rowe, Jon
> Kristofferson, Joe Condraci.
I worked as a manufacturing engineer in Framingham Massachusetts. I
checked/tested/fixed ECO's and did QA on CPU boards. It was one of my
first (paid) computer jobs while I was still in college. I only knew
some manufacturing people, and I'm sure I don't remember their names.
I'm not even sure what products I worked on since we used project names
like Cheetah and Tiger (the two I remember).
----
There are only 10 types of people in the world, those who understand
binary and those who don't.
