Hi
Yesterday I picked up a Datasaab D12. Which I didn't know
existed until then. Pictures here:
http://imgur.com/a/vPTZw
It's a small desktop computer intended for small business
accounting and invoicing. It's built arround an intel 4004 and
has room for expansion cards for memory and "customer roms".
The service guide mentions a "two level" environment with a
"basic" level and a "customer program" level. I'm hoping it
means there is a Basic interpreter but I'm not convinced. The
manual also mentions a "D12 assembler" as the develoment
environment. It's apparently a subsystem that comes in a nice
attache case:
http://imgur.com/QQUrcGh
It's actually made by Facit and may go under that name.
Does anyone know more or have manuals?
Regards, Pontus.
JOOI, does anyone know when Panaplex 7-segment displays started going the
way of the dodo, to be replaced with LED displays (and, on the back of
that, what were the advantages of a Panaplex-type display over an LED one?)
I just saved a few boards from a dumpster with such displays on (they're
actually Beckman ones, not Burroughs), but I was a little surprised to see
IC dates into 1981; I thought by then things had moved over to LED.
I'm almost certain that they're from old gas pumps - maybe the displays are
just more readable in bright sunlight than LED? (there's a sticker on one
of the PSU boards with a 'shipping date' in 1999)
cheers
Jules
We spent Friday and Saturday debugging the PDP-12. We replaced a bad SN7400
driver chip and three bad bulbs in the front panel. We can now trust what
we see on the front panel for debugging information.
We tried some of the PDP-8 and LINC instructions and noticed that some of
the bits in the Instruction Register were stuck on. We swapped the two M216
(six flip-flops in three SN7474 ICs) flip-chips that make up the IR and the
stuck bits moved. We replaced the broken M216 with a spare, and now all of
the IR bits work correctly. With a working IR, we found that lots of the
PDP-8 instructions, and many of the LINC instructions now work. We can turn
the relays on and off and make noises through the speaker.
During other DEC restorations we have replaced LOTs of SN7474 ICs. We
pulled all of the M216 flip-chips and ran them in Warren's tester. We found
and replaced another bad M216, the one in slot E8 that controls the core
memory states. Now core memory works!
We went through the troubleshooting guide in Maintenance Volume-II. It has
a procedure for doing a quick test of core memory that revealed a problem
in the upper addresses. From looking at the prints it had to be one of two
G221 flip-chips. We swapped in a spare and found that the one in slot C09
was bad. Now all of the first 4k of memory works.
There is a problem with any PDP-8 instruction that has an address in the
lower 9 bits. All 12 bits of the instruction are used, so it makes a mess.
Debugging that issue will be the next project.
--
Michael Thompson
I have been on this list for a long time as a reader and wanted to give the
list a heads up on this system before
doing anything else in case somebody wants it and can pick it up.
--
Cabinet 1:
Quickware Engineering QED-95 CPU replacement
2- TU-58 tape drives
Cabinet 2:
BA11-KW
RX02 floppies
Cabinet 3:
2- RL02 disk drives
1-MDI 76-contains 1 Maxtor XT8760EM 760 Meg HD
Cabinet 4:
2-RL02 disk drives
1-MDI 276-contains two Maxtor XT8760EM 760 Meg HDs
I am asking US$3000.00 for the four cabinets. I can't guarantee anything but
it was turned off working fine.
The buyer would have the option of buying up to 18 RL02K-DC data carts for
US$25 each
Shipping is probably not an option they are about 300lbs + each
I am located in Kelowna BC Canada about 3hrs north of Spokane Washington..
Preference would have to go to someone that could come and get it.
Pictures are here
http://photoshare.shaw.ca/view/32499942349-1432868285-94725/0
Rod
Rdooley at shaw dot ca
