Where might I find a schematic diagram for the Xerox U07 8" FDD,HDD
expansion cabinet for the 820II, and/or the 105P80450 power supply?
The Xerox Professional Computer Technical Reference Manual I downloaded from
bitsavers.org doesn't seem to have those particular schematic diagrams.
For your enjoyment the part which smoked.
https://www.dropbox.com/s/al9kx3yw9ypwp89/Xerox105p80450.jpg?dl=0
I certainly am glad I have the lid off while testing. Unfortunately these
capacitors which appear to be film type were hidden from view.
The fuse didn't blow, but that .22uf 250v capacitor certainly stunk up the
house. It smelled like burnt popcorn, plastic and the bottom of a coffee
pot which has boiled dry, yech!
I know that if I had pulled the power supply board first I might have seen
the physical cracks in these boxed capacitors.
Wasn't it Marc V. that said in one of his videos, you don't need to shotgun
them all! Oi, lol
It's when things like this happen that I most always worry about not going
over vintage equipment fine tooth comb.
Don Resor
Hi all,
anybody has some GCC or any other tool chain for the above?
Or some pointers, which was the last version of the GCC tool chain which
supported the i860, and would be still compile-able on this days tools/OS's?
Anything?
Thanks in advance!
> Date: Wed, 12 Oct 2022 15:54:33 -0500
> From: Steve Lewis <lewissa78(a)gmail.com>
> Subject: [cctalk] datapoint 2200 programming
>
> Does anyone know how the 1970/1971 original Datapoint 2200 was programmed?
> It had tapes containing terminal programs to access different types of
> systems. And the instruction set was said to be similar what became the
> 8008. But how were these terminal programs created and how were the tapes
> written? Were they under emulators on larger systems, like a PDP-10?
> Were there any tapes that had something like a machine code editor and
> tape-write routines? I assume no kind of ROM was built into the system
> (unless it had a built in machine code editor, and routines to write that
> content to a tape?) Was a version of BASIC ever built for the 8008 that
> ran on a Datapoint 2200 or similar system?
>
> -Steve
While in college, 1973 to 77, I had a part-time job where one of the things we did was use a Datapoint 1100 dual cassette model to act as a data entry terminal for a database system running on a Cascade 80 minicomputer.
I did the Datapoint programming, which was to query the db over an async line for a form template, allow the operator to fill in the form, then upon entry, send the data back. The db would provide the next form to display. A rudimentary state machine at several levels.
The Datapoint came with a Cassette Tape operating system, called CTOS I believe. You booted it up, and the second drive was your working drive. The Programmer’s manual referenced shows you the commands. There was an simple tape file system, Editor, Assembler, Debugger, and a library of subroutines for common access to the system’s I/O.
I remember very little about the details of working on it, but I had no problems getting the data entry system working. You just sat down and started programming it. The instruction set was the model for the 8008, but it preceded the popularity and availability of that chip.
My boss did some real inspired work on the Cascade Data side. He managed to insert the database access code into high memory of the system, and hook into the native OS. So we could use the system normally, but the database serviced the terminal in the background. I did other Cascade programming in assembly, I wrote my own instruction card for the system.
In my senior year, the facility switched over to using IBM System 3 equipment, and I got to work with RPG, 8-inch diskettes, and 96-column cards.
Dave.
Sent from Mail for Windows
Hi all!
Been working on my 386i's, all the power supplies are smoked, so I
bought a totally burned out one, gutted it, and connected a PC/AT power
supply up to the card edge. Sure enough it works, and I now know that it
needs +5, +12, -5, -12 (for the ISA bus) and a 5 volt "supply ready"
signal as well.
Also found the serial console interface works, and realized I should
update the 386i FAQ with this information. So what would be the best way
to do that in this day and age?
CZ
Trying to tar a directory and transfer it to my AT&T 7300 (SVR2 unix).
Tar -tf works fine on the Mac OSX, but when I copy it over the Unix (not
gnu) tar gives me a:
Tar: blocksize = 20
directory checksum error
When I try to tar -tf the file. Which usually means the block size is off.
Any way I can check to see what the block size is on a modern system
(like a Mac)? tar -tvf doesn't seem to tell me.
Thanks!
C
> Yes. I have a description of my recreation of the Gazelle on my web site, as well as notes on restoring the one for
> VCFe.
> Rich
Very interesting! Reading through it all now. I notice you use Tarbell
disk controller... difficult to use the SCP DiskMaster? I don't find many
references to systems running it. It supports SD/DD 5.25/8... I had
planned to go 5.25"
- Ethan
At 09:16 AM 10/11/2022, Sellam Abraham via cctalk wrote:
>Yes, eBay charges the seller the same commission on shipping as it does for
>the item price, and the taxes charged to the buyer as well.
A year or so ago, I tried to figure out how to even see a detailed
breakdown of eBay's costs and commissions on several servers I'd sold
for a client. I gave up. I'm convinced it is purposefully opaque.
You get what you get.
- John
Is there a 3D print gcode for the hardware that connects a PDP8a front
panel to the chassis?
Is there anyone who has a spare clips/clamps hardware to attach a PDP 8a
console to the chassis?
I picked up the donated PDP 8a mentioned earlier on this list, I got it up
and running. I need to track down the hardware to attach the front panel
to the chassis. I do have spares of the hardware that attaches the ON/OFF
panel to the chassis.
AS with all "free" donations it's the final mile that costs the big $$
Thanks
Bill
At this point I have achieved the SCP CPU card, a CPU support card and a
Disk Master card. So hopefully all I need is some kind of 16 bit RAM board
and a 4 slot S100 backplane and I can boot 86-DOS.
I have started to read through the documentation on the hardware.
Has anyone else been down this road and built a system to run this?
- Ethan
--
: Ethan O'Toole
Hoping there's an Apple enthusiast out there somewhere please.
A friend gave me a PM G5 which I'd love to add to the Apple corner of my
collection. Must admit I love the G5 case. Problem is the internals are in a
million pieces but everything seems to be there. Its not a basket case, more
like a bucket case because I took the side off and basically poured it all
out.
My options are.
> Toss it
> Use the case for an ATX conversion
> Use it for a letter box
> Have a crack at fixing it.
I like having a crack at fixing things first. I'm a preservationist first.
Problem is my GoogleFoo can't find any diagrams, illustrations etc on how
the internals are put together and I'm hoping some Apple person out there
might have something or be able to point me somewhere. (I did find some
photos at https://www.overclock.net/threads/power-mac-g5-build.1452312/ for
a twin CPU model but I need more detail for a single chip 2.0 GHz PowerPC
970MP (G5) model.)
Thank you.
Kevin Parker
