I was running it on a M68k VMEbus. Version PDOS/68020 R3.3a 20-Nov-87. I believe BitSavers or archive.org has some reference material
Richard
Sent from Mail for Windows 10
I have a odd TMS9900 machine with floppy drives that would be interesting
to get an operating system runnig on. The Eyring institute PDOS looks
interesting and I have found a page describing it.
https://www.vaxbarn.com/index.php/other-bits/105%20-pdos Unfortunately none
of the download links works.
I sent a few mails to Camiel but it seems like they might have ended up in
the garbage folder so I am trying this public mail instead and hope that it
gets through!
I really appreciate if the links could be fixed so that I could download a
copy. And source code for the boot ROM would be nice.
Or is there someone else that have a copy of the manuals and the binaries?
Thanks in advance!
/Mattis
I am in the middle of refurbishing two drive controllers, a Percom At88
with doubler board, and a Percom At-88SPD. Neither has mechs and my
search for them has been frustrating. The mechs are like hens teeth
online, and when I find them they are insanely expensive.
I know there's gotta be a pile of them out there just rusting away.
I'd like to give as many as four a good home.
Mechs I can use are, in order of desireability: 5.25" 40 track, double
-sided, 80-track double-sided, 40 track single-sided.
3.5" mechs (preferably with adapters for 5.25" mounting, have got to
have jumpers for drive number selection. Most 1.44's will work on
these controllers as 720k drives if the right media is used, or,
better, if the drive has jumpers to force the density select.
I hate to bother with such a petty thing, but I could sure use some
help getting these things running. They are nice drives. I repaired
one already, and got it driving a broken MDD210, the only mech I have,
but that is so flaky it is of no use other than to let me know my
repairs have got the controller working again.
Best,
Jeff
>
>Very likely a semi custom or custom memory device, due to the prefix.
Armed with that and the fact that pin 1 connects to the leadframe I
figured maybe it's something like the 6830 Mikbug prom -- 0V on 1, 5V
on 12, data on the left, address on the right. Tried reading it like
that (for all 16 combinations of chip selects) but 0xFF throughout.
So I popped the lid, stuck it under a microscope. The chip says
"MCM6816" which is in fact a 1k ROM.
Anyone have more information on the 6816 ROM?
Thanks
W
This is a bit of a hail mary...
I recently won a Univation Intenral Hard Disk System for the DEC Rainbow
100 card, memory and drive.
But it came with the wrong docs and no diskettes.
Any chance that anybody has anything in this area squirreled away somewhere?
Warner
Hello,
Maybe someone in the UK would like an AS400..Got the following through
vintagecomputer.net contact form:
".. I have as400 fc5070 exp unit v.large & brocade silkworm 'ibm
director'netswitch,new,v.large,needing pick up from uk,s.e.kent,
ct91rp,anyone who wishes too use,app center full of archives etc, no longer
can store them,up for grabs,email pref.."
Send me your contact info (email preferred) and I will forward to the
person. I don't know the guy, no affiliation, never been to Kent.
Bill Degnan
There are 28 pallets of older HP and Cisco equipment being sold by a broker
in Germany. The equipment is located in Hungary.
If you can handle taking in a huge amount, and you are in Europe, please
contact me.
This is not a pick and choose. It is a "take all" situation and will require
payment. I do not know the requested value for this lot. I also do not know
what the equipment is. A list is available on request.
Cindy Croxton
Electronics Plus
---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus
It turned out my friend was wrong. The power transformer is most likely ok.
But one of the main choppers were short circuited (yes, it is a switcher,
again to little info from my friend).
Anyway. The chopper transistors were TI made in 1978 but marked T484.
Probably some IBM marking which no one has the cross for.
I replaced them with nice high voltage high current TO3 transistors The
only thing i could get from the original transistors except for the
physical appearance was the polarity.
With a 5.6 ohm resistor on the 5V i fired up the PSU with a 60W lamp in
series with one of the mains leads. Nothing happened on the bases of the
switchers until I got to around 190 VAC input.
At that point the base went high and stayed there.
Really strange. Of course I have no schematics for this IBM thingie. Does
anyone have a schematic for the IBM 5110 PSU? I think I really need it to
understand what is going on.
Tracing it out is an option but then all those square metal canned IBM
ICs...
/Mattis
