Hi,
I recently acquired a Solid State Music SB-1 from which all the chips had
been removed. I've reinstalled all of the chips (I located an SSM2000) and
I've been trying to figure out why this board crashes my computers. The
conclusion that I've come to is rather astounding. The board specifies two
74ls85 4 bit binary comparator chips to perform address decoding. The
designers of this board seem to have had incorrect pinouts for it. Every
source that I can find specifies:
B3 1 16 VCC
A<B (in) 2 15 A3
A=B (in) 3 14 B2
A>B (in) 4 13 A2
A>B (out) 5 12 A1
A=B (out) 6 11 B1
A<B (out) 7 10 A0
GND 8 9 B0
The 7485s that I was able to get have this pinout. BUT! The SB-1 is
designed as:
B2 1 16 VCC
A2 2 15 A3
A=B (out) 3 14 B3
A>B (in) 4 13 A>B (out)
A<B (in) 5 12 A<B (out)
A=B (in) 6 11 B0
A1 7 10 A0
GND 8 9 B1
I Ohm'd out the board to verify this and it matches the schematic here:
https://wiki.theretrowagon.com/wiki/Solid_State_Music_SB1
What the heck??? Did the pinout of the 7485 just arbitrarily change at some
point? Was this some competition between manufacturers? Is there any way
to get the "right" 7485?
Thanks,
Bill
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A bit off topic but I'm curious if anyone has any technical information on
Animatics motion controllers. Animatics was based in (Santa Clara) in
the 1990s. They were bought by Moog sometime around 2000 and all the old
info was thrown out.
A support engineer working for Moog (who had worked for Animatics before
the buyout) provided a bunch of DOS utilities and info on the RS232
programming that he found on a backup, but this is all the info that exists.
Schematics for the hardware (CPU is a Phillips SCC68070 with a MC68881 math
coprocessor), firmware code and any other technical info would be great.
Wayback machine link:
http://web.archive.org/web/19990218104405/http://www.animatics.com/5000list…
eBay link to an actual controller: https://www.ebay.com/itm/124030784795
I have just stumbled across this nice "Timeline of Computer History" from
the CHM:
https://www.computerhistory.org/timeline/computers/
I have not seen this before and thought it may be of interest to this list.
Tom
Is it just me? I have recently sent an email to this guy about two
different topics. There was no response in either case. What is going on?
Or am I missing something?
Many thanks,
peter vp
I know this is sacrilege but I am looking for the front panel of a *Data
General Nova *and/or *a DEC PDP 8/11/12/15*.
Why? I collect artefacts from the days of the minicomputer and earlier and
I want them for my collection/display. They should be not too damaged and
of course do not need to be functional. I would be willing to pay
postage/freight.
Any offers? Any offers?
Peter
PS Please don't shout at me!
All the discussion around 8" disks reminded me about a question I've not
been able to find an answer to.
I've got a Qumetrak 842 drive that I use for imaging 8" disks with either
ImageDisk or AppleSauce. When I first tried it out with AS, the listed
RPM was > 7K. It turns out that the disk I was working with was a NOS
Dysan that had both the single and double-sided index windows punched in
the jacket. The 842 has both of those index sensors, so both were being
triggered one after the other. The solution was to cover one of the index
windows on the disk.
The question I have is how did a contemporary system deal with the
combination of a disk with both index windows and a drive with both index
sensors?
tnx!
g.
--
Proud owner of F-15C 80-0007
http://www.f15sim.com - The only one of its kind.
http://www.diy-cockpits.org/coll - Go Collimated or Go Home.
Some people collect things for a hobby. Geeks collect hobbies.
ScarletDME - The red hot Data Management Environment
A Multi-Value database for the masses, not the classes.
http://scarlet.deltasoft.com - Get it _today_!
Hi All:
I’m pleased to report that my 11/45 and 11/34 which were in need of a new home have been taken by another collector here in BC. They will be off to a very good home!
Thanks for reading my post.
Kevin
Hi All:
I’ve been a collector of old DEC systems for about 30 years. I haven’t been active on the list for the last decade or so due to work, but am “surfacing” now as my wife and I are moving and I need to find a good home for two of my systems and their peripherals.
I can follow up with photos et cetera if necessary, but the subject line really says it all: a functional 11/45 in a 6’ standard DEC rack, and an 11/34 in a shorter DEC rack.
Both systems are functional. The 11/45 has an RK05. The 11/34 has a TS03.
I also have a TU80 9-track tape drive (short rack), and dual RL02 drives in another short rack that go with the systems. These would come with a couple dozen tapes, and about 10 RL02 packs. I have a few RK05 packs as well.
I would like these systems to go to someone who understands them and will use them. As members on this list will know, they exemplify computing in the 1970s through the 1980s, and it would be nice to keep them running for educational and historical purposes.
The systems and peripherals are free, but they must be picked up. I cannot ship, nor do I have time to separate components.
If I cannot find a home for these systems then they will, unfortunately, be headed to the metal recycler. I have tried museum donation but bureaucracy gets in the way and decisions take far too long. Hence I am offering the systems here on the list.
The deadline for pickup is October 15th. This is a hard deadline as we must vacate our house. I would take the machines with me if I could!
Kevin
Sent from my iPad
20 years ago I loaned Fred van Kempen a pdp11 disk pack (RK11?) to try
recovering for me. We think it may have the Dutch "GUTS" operating system
(Groningen University Timesharing System -
https://gtoal.com/history.dcs.ed.ac.uk/archive/scans/guts/*.pdf ) and
sources on it. My Dad carefully hand-carried it to the Netherlands from
Scotland by boat and bicycle!, avoiding any magnetic scanning on the way.
I never heard back from Fred and every now and then (some years apart) I
try to contact him but all the mail addresses I've tried go unreplied or
bounce.
Does anyone here know him and have a reliable way to contact him? He might
be in the USA now and the only indication I have that he's still alive is a
github update in Jan of this year (and happily a lack of hits when looking
for an obituary!).
I'm assuming he never extracted the disk contents because if he had I'm
sure he would have contacted me. If the disk has not degraded too much
over the last 20 years since I last saw it, I'ld still like to recover it
and so I'ld like to get it back from Fred and give it to whoever else might
be able to read it.
Thanks,
Graham
