so by your reckoning not all of the asics are readily
reproduceable. What about the gate array on the
graphics board (lets pretend there wasnt a primitive
ttl prototype to guide)? What about the 7220 itself?
Now something like that is bound to have loads of
docs.
--- cctech-bounces at classiccmp.org
<ard at p850ug1.demon.co.uk> wrote:
> >
> > On 1/27/2006 at 11:33 AM Joe R. wrote:
> >
> > > Photograph it yes but a schematic is MUCH more
involved since all dies
> > >have multiple layers. It's sort of like trying to
make a schematic of a
> > >multilayer circuit board when all you can see is
the top layer.
> >
> > Ditto that--and recall that we're talking here
about an old graphics
> > controller; no crypto and (relatively) very old
technology. I'd rather
>
> If we're talking about the Epson QX10, then there's
no problem at all.
>
> The later version of the board (which is what's in
both my machines)
> contaisn a 7220 (data sheet available), 16 RAMs, a
bit of TTL and an
> Epson gate array. But the technical manual shows
schematics for that _and
> for an earlier version_. That doesn't have the gate
array, it has more
> TTL and a character generator EPROM.
>
> There must be some differences between the 'extra'
TTL and the gate array
> (IIRC there's a latch on a bus in one version that's
not in the other),
> but they are sufficiently similar that you could
recreate a replacement
> for the gate array based on the schematics in the
manual. The only thing
> you wouldn't have is the exact font of the character
generator, but I am
> sure you could create something that was readable.
>
> A bigger problem in maintaing the QX10 are the 2
hybrids in the SMPSU
> (but IIRC part-scheamtics without component values
are in the manual) and
> the 2 ASCIS on the floopy drive. And you'd have
probllems swapping out
> the complete drive as this is a 1/3rd height unit
(not to mention the
> fact that you'd want to keep the original one since
it's an interesting
> voice-coil unit).
>
> -tony
>
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Hi,
today i received a pair of ISA boards, that contains a clipper CPU board and a some memory ...
... unfortunately, there was no software and documentation included, and Google doesn't seem
to be my friend on that topic :(
Can anyone help me to get the boards back to life ?
Thanks Bernd
Bernd Kopriva Phone: ++49-7195-179452
Weilerstr. 24 E-Mail: bernd at kopriva.de
D-71397 Leutenbach
Germany
Up on EBay is an old CDC disk drive tester, mis-described as a power supply.
It's a heavy unit, just barely portable (speaking from experience). There
were a few different models of these, depending on the drive. From what I
can see of the preamp card, this is for the module drives (SMD, CMD, etc.).
Hard to tell without better pictures and my memory on the part numbers has
faded..
Not much good these days, unless you are one of the few with some of these
old drives around. But the testers were fun to play with, and I've torn a
couple apart just for the components.
Billy
Search on: 7583142079
possibly by using a planer or shaper - seldom used in
machine shops these days, but there was a shaper type
tool used in the movie adaptation of the Andromeda
Strain. And surface uniformities of .000025 inches
(25/1000000 inches) can be produced in metals using
essentially a sharpened chisel - a process known as
hand scraping. A precision reference and a die is used
to expose high spots, which are cyclically removed
with the scraper.
--- cctech-bounces at classiccmp.org <aw288 at osfn.org>
wrote:
> > I don't know about grinding, but the guy at MIT
who figured out the Xbox
> > innards did something of the sort (regardless,
it's a great read):
>
> A guy I went to school with does this for Motorola.
He gets chips back
> that are failing in the field and dissects them to
find out what went
> wrong.
>
> I think the actual process involves shaving rather
than grinding.
>
> William Donzelli
> aw288 at osfn.org
>
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There is a bit of a spat going on in a few forums regarding color index
#6 of IBM CGA. The old-timers know that it is brown from experience and
existing working hardware; the newbies (writing or using emulators) are
unwilling to accept that and are instead making CGA palettes with dark
yellow instead of brown.
Can anyone give me the history on why #6 is brown? Was it a design
mistake, or intentional? Is it a property of the monitor or something?
I can't find anything of substance to offer the newbies to convince them
otherwise; digital photos can be accused of being doctored or
miscalibrated (and yet is a digital photo showing "yellow" that started
this whole thing). About the only thing I can think of to offer as
proof is that the text colors in the VGA palette show brown, and IBM
wouldn't have done something like that by mistake -- or were they
perpetuating a mistake?
--
Jim Leonard (trixter at oldskool.org) http://www.oldskool.org/
Want to help an ambitious games project? http://www.mobygames.com/
Or check out some trippy MindCandy at http://www.mindcandydvd.com/
I think the board in question is made by CMD Technology CQD 443-tm. The T
indicates tape, and the M indicates Disk controller. What did you need it to
do? I have both TK50 and 70 interfaces, drives, and media.
Paul
Alright, I here are the results of my measurements on the RK07.
My first step was to replace the 6-button/indicator panel with
the *original* panel. When I got the drive, the "B" button was
a little damaged, so that the white "B" plastic cap did not
lock on properly on the button. I had a complete panel, so
I swapped the two. That was some months ago.
As I connected the RK07 last week or so, I found out that two
bulbs were defective, and replaced them after checking with
the *Ohm meter* that those were OK.
I wrote that the READY lamp did not light up, and I did check
that the bulb was OK ...
I had fixed the panel with the "difficult" "B" button cap, so
I replaced the two panels. The READY lamp goes ON!
Great, the RK07 drive is OK, it must be something with the panel.
I swapped the two panels again, and yes the READY lamp stays off.
Again, I swapped the two panels, and took the suspicious panel to
my shack (more test equipment available there).
Applied +5V to the panel board ... RUN STOP, WRITE PROT and FAULT
turn on, READY, "A", and "B" stay off. For "A" and "B" that is
correct as they are connected via an inverter. Applying Gnd to
the input pins of E1 (on the Operators Control Panel), and "A"
and "B" turn on. But the READY lamps stays off; OK, so E3 is gone.
However checking the input (6/7) and output pin (5) shows the
correct functioning of this 75452! Is the lamp defective again?
This time (on the work bench) I did not use an Ohm meter, but
the +5V power supply ... the lamps glowed *very* dim, barely
visible! The lamp has a different rating!
I installed a +6.3V type in the READY indicator; the panel works!
Please don't laugh :-)
It turned out in the end that just a simple light bulb of wrong
rating got me working for several hours!
Lesson learned: check and double-check, do not assume the worst,
but start with the very simple things!
BTW, an other good thing comes from this exercise: I checked on
bitsavers, and there is no field printset of the RK06/RK06.
I will scan my set this week and upload it.
- Henk.
________________________________
Van: cctalk-bounces at classiccmp.org namens Tony Duell
Verzonden: za 21-01-2006 01:35
Aan: cctalk at classiccmp.org
Onderwerp: Re: RK07 questions
> Wow, thanks Tony!
> I had not even had the time to pull the RK07 diagrams from the stack!
You were lucky. I happened to know where my RK07 prints were...
> This gives me a jump start, and I hope to get to it this weekend.
> I'll let you know ...
Good luck. Feel free to ask anything abotu this drive's hardware. I find
it a particularly interesting one, and spent many enjoyable hours reading
that print.
-tony
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Thank you for your cooperation.
OK, I picked up scads of ISA NICs, various brands, no manuals or
drivers but you can probably find them online or built into Windoze.
Most of them are RJ45 connector, some of them have a thinnet connector.
I also have some video cards and some SCSI cards and some sound cards.
I'll post a detailed inventory to the list over the next couple of days.
I left the PCI NICs behind as they are so cheap to just buy.
I rescued 4 IBM brand PCs (P-II, various MHz, HD, RAM): 3 PC 365s and
1 PC 350, 5 IBM brand keyboards and 10 ft. power cords to go with them.
Sridhar has spoken for the tape library, but a couple of you folks
also expressed interest. Perhaps if Sridhar doesn't feel like paying
the freight shipping (it will be pricey as I'm about 2,000+ miles away
>from him) one of you that's closer would like it. Feel free to
discuss that amongst yourselves! They were happy that someone would
adopt it and its 3 dead drives and 1 good one plus media (which we
have to bulk erase, that's why it was removed) so that they don't have
to figure out how to dispose of the thing.
There are cases and complete PCs, all in working order as I posted
earlier. These machines were used for testing until decomissioned for
being old, not broken. All are free for pickup. Employees already
took everything they wanted, although a few (like me) grabbed
additional items today. (How can I resist free? :-).
If there is anyone local to 84095 zip code that repairs monitors,
there are about 20-40 monitors of various sizes (up to 21" IIRC) that
have problems but could probably be repaired quickly if you do that
sort of thing often enough to quickly diagnose and troubleshoot the
problems based on symptoms.
--
"The Direct3D Graphics Pipeline"-- code samples, sample chapter, FAQ:
<http://www.xmission.com/~legalize/book/>
Pilgrimage: Utah's annual demoparty
<http://pilgrimage.scene.org>
