(This is a follow-up to an earlier posting, but with some corrections
and further information.)
I recently acquired an old Macintosh II. In it was an older SuperMac
video board. Based on the pictures on Radius' web site, I have concluded
that this is a Spectrum/8 (original), Part # STD9411, Assy #
1002689-0001.
The label on the ROM reads:
SUPERMAC TECH
SPECTRUM D6
1002690-B 1986
According to Newer`s SlotInfo program, The card revision is 1.0B9 and
has a part number of VGB-1.
Per Radius' FAQ, I have tried holding down the OPTION key while booting,
but
never got the "round robin" video mode selection. I have also tried
running SuperVideo 2.7.5 which tells me I must have ROM version 1.9 or
later in order to select a monitor.
Currently, the card seems to be "stuck" in what I assume is the default
mode of 1016x768.
So, does anyone have:
1) Info on how to get the card into other modes (pref 640x480 for now).
2) Setup software for this old a card.
3) Any info on support monitor resolutions and frequencies?
Thanks in advance...
<<<John>>>
> > Generally for the old machines we talk about on this list, the chip type
> > code is easy to differentiate from the date code, because of the
> > prevalence of 7400-series TTL chips. Any 74xx or 54xx number will be the
> > chip type, while the other number will be the date code.
>
> Until you get a machine built in 1974 :-). It's happened to me, it's
> mentioned in 'The Art of Electronics', and it's doubtless happened to
> others here.
Too right. And they don't half misbehave when you mistake the date code for
the logic function :-)
I've got a large boxful of TTL with 74 date codes. Trouble is, I *still* can't
tell which is which on one or two of them, just by looking.
--
Pete Peter Turnbull
Dept. of Computer Science
University of York
Has anyone noticed any problems with the list dropping msgs ?
For example I posted some replies to the "Good find" thread and never
saw them. I see there was also a "Hyperion" thread which from Jason Pero's
reply I presume was posted by Doug Yowza (sp ?). I figured at first it was
just a glitch in my upload, but the "hyperion" miss says something else.
I'll have to check this with my ISP, if no one else is having this problem.
thanks larry
lwalker(a)interlog.com
re my own message:
In a search of comp.sys.tandy I have found that the Dick Smith System 80
(TRS-80 Model 1 clone) was known as the PMC-80/81 in the US if that helps.
Phil
Well,
The prognosis is not good for the Cadnetix system. I have tracked down a
couple of engineers from the original company (Which was bought by Daisy,
bankrupted, and bought by Intergraph) working at various places and no one
seems to be able to help. The two most common responses are first that I
am some kind of lunatic for wanting to get a proprietary circuit-design
workstation running, and second that any and all technical/engineering
documents for all Cadnetix hardware is compost in a Colorado landfill. One
of the binders that I grabbed with the system was the maintenance record,
and tells a dismal tale of constant board replacements for various
failures (no wonder they went broke), including a description for what is
happening now. The final result that time? After replacing the drives,
replacing all of the boards, and checking all jumpers and cabling,
Cadnetix just shipped out a newer unit to replace it. Oh well. One
interesting note is that this document has some monetary figures on it;
this company was paying over $16K a year to lease a 68020 with 4megs of
ram and 240megs of storage (2 80meg HD's and the 80meg Cipher), circa
1986.
I was told by one legacy dealer that my Pertec-interface Cipher C880 is
worth about $50 to scrap dealers. He then offered me a complete IBM System
36 with drives,tapes,interfaces, etc., that I'm going to pick up this
week. BTW, does anyone have an extra pertec-to-scsi adapter laying
around in the closet? ;)
Aaron
At 03:57 PM 4/2/98, you wrote:
> Actually the machines are the same size. The PF keys are deeper on the
Um, no... The 102 is thinner than the 100. That's one of the photos I
took t'other day for my m102 page (getting 'em developed this week, then
gotta scan them (gotta un-bury the scanner first), then get all the data
files ready...) I'll post the pictures as soon as I get them scanned.
(P.S., for more images than you can get to properly, check out
<http://www.sinasohn.com/clascomp/images/> -- you'll see the directory
listing of all the images I have so far.)
> 7) A telephone cable to connect the MODEM in one of these to a standard
>phone jack. It has a 8 pin DIN plus that fits the MODEM post and two phone
>cords coming out of it. There is also what appears to be a dummy female
>connector that fits over the male connector.
The idea was to be able to leave it in place:
Wall|=--------.----------=|phone
|
m100
If the m100 was connected, the phone was not. The dummy female connector
simply shorted the appropriate wires so the phone would work again.
> I will take $50 plus shipping on the computers ($40 for the one missing
>the label) and best offer on the extra pieces. Or I will trade for HP
Since I have 3 m100's, a m102, and 2 NEC 8201a's, I'll let other take
advantage of this... 8^)
--------------------------------------------------------------------- O-
Uncle Roger "There is pleasure pure in being mad
roger(a)sinasohn.com that none but madmen know."
Roger Louis Sinasohn & Associates
San Francisco, California http://www.sinasohn.com/
About the fisrst RL02 spin problem:
THere's a small rubber button that pushed the pack cover detector too see if you
have the pack cover in. That button had become depressed over time by pressure.
I fitted a washer around the rubber plug to stick it out more.
Now the drive spins up normally and it doesn't need me to weight the lid.
-------
>
>> > Can I make one,
>> > get one REALLY cheap, or operate the thing without one? Also, it
>>
>> Don't know. I bet it emits RF, and the tablet probably has a circuit
board with
>> traces running horizontally on one side an vertically on the other.
My Dauphin
>> detects the pen in this manner.
>
>The older sumagraphics tables like the Bit Pad 1, the ID series and the
>Apple graphics tablet worked by sending a magnetic pulse along some
wires
>made of special alloy. I believe this pulse travelled at approximately
>the speed of sound in the wires - there was a shock wave that travelled
>along them caused by magnetostriction.
Magnetostriction?
>The puck was a simple sense coil. I had to rewind one of mine once, and
I
>seem to remember it was something like 11 turns of 30swg wire. That
would
>be a start anyway.
>
>Also I seem to remember that the buttons on the puck had 100k resistors
>in series with them. The other side of the button was grounded. This is
>also critical - otherwise noise breaks through into the sense coil
amplifier.
>
> / 100k
>Gnd----/ o---\/\/\---- Button input
>
Do you know the pinout for the plug?
>
>Certainly the Bit Pad 1 came in a serial version (and also a GPIB
>version and a parallel version).
>
>There's another type of tablet that consists of an XY matrix of PCB
>tracks - plain copper PCB tracks. They are individually driven by a set
>of decoder/driver chips which are driven by a simple microcontroller.
>Again the puck is a simple sense coil.
>
>Thing is, it has a much better resolution than the spacing between the
>tracks. And there's no extra hardware, like high-speed-ish counters.
I've
>never figured out how that one works - any clues?
>
Well, I have this second one. My guess is that it uses capacitance,
like touch-to-turn on lamps.
>-tony
>
>
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I have a bunch of 80 MB mac hard drives. would an old PC SCSI card
run them?
>
>HUH? Neither of these are an helped/hindered by the 386. SCSI is not
>needed to run 1.44/1.2 FDDs. You can put scsi in there even when it
was
>an plain xt. To run the bigger floppies you need a controller that
will,
>most XT controllers will not. JDR and JAMCO sell a board that will do
up
>to 2.88 drives in a XT slot.
Has anyone actually seen a 2.88 MB floppy drive?
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Ward Donald Griffiths III wrote:
> Max Eskin wrote:
> >
> > I found a PS/2 Model 70 recently, which would normally have a 386,
> > but the previous owner installed a Cyrix 486 upgrade chip. Does
> > anyone know if I can use a 386 math coprocessor with this? I want
> > to run AutoCAD.
>
> The i486 has a coprocessor built in, I assume that the Cyrix does
> as well. Try the software. IIRC, AutoCAD doesn't _require_ a math
> coprocessor, but one does help performance by an order or two of
> magnitude on a 386.
> --
No, the Cyrix 486DL (I assume it is a DL or DR2 if it's in a 386
motherboard) is not the same as an Intel 486. The Cyrix 486DL was an
upgrade CPU for the 386 pinout, adding a 486 instruction set and 1K
internal cache. The 486DR2 version was clock doubled. These CPUs do
not have floating point. Generally an Intel 80387 did not work
reliably, but the Cyrix 487 co-processor did. ULSI (and I think IIT)
also made 487s. You can try the Intel 387, sometimes they ran ok,
mostly it depended on the speed range used.
Jack Peacock
