I'm reverse engineering the PC boards in my Wang 2200. I have been able to
find most of the chips that have been used on the board I'm currently
workign on, except for a couple.
Does anybody know the pinout for these?
1) 8T10, quad latch (with either tristate or open-collector outputs, I
don't know which)
It is a TTL device, made by Signetics, I think. 16 pins. 1976 date code.
(N8T10B is the fullly qualified part name)
2) This one is a reverse job. The microcode board has quite a few mask ROM
chips. I don't care what the actual part number is, but I'm hoping someone
will say, "hey, that pinout is just like a ..." so that I can find a prom
programmer to read the thing. If I have to, I guess I could build a
parallel port dongle to read them. Here's what I know:
24 pins
data out on pins 16-23
pin 1 is +5V
pins 2-8, 10, 11, 13, 15 are the address pins
pin 14 is either a chip select or output enable; active low
pins 12 and 24 are pulled up to +5; chip selects maybe?
pin 9 might be -15V (!)
Embarrassingly, I can't find a connection to GND. unfortunately, I don't
know the backplane connections either, so I can't identify if pin 9 is
really -V or just an alternate ground (but I see a bypass cap between the
digital ground and this net, so it makes me think).
BTW, I have started a web page to archive this information if anybody cares:
http://www.thebattles.net/wang/wangtech.html
So far I only have one simple I/O board done. Once I have enough of the
system figured out, I'll write an emulator for it. That's where all this
reverse engineering drudgery becomes fun.
Thanks for any suggestions.
-----
Jim Battle == frustum(a)pacbell.net
>Did you ever get the Pin Out Diagram for the VT220 Serial Connection Port?
>
>I am currently in the same boat that you were, and can find little or no
>references anywhere?
You can look on the DFWCUG website
http://208.190.133.201/decimages/moremanuals.htm
and pick up a number of VT220 docs (the VT220 printset
is on its way too ...). You can probably find more at
http://www.vt100.net too.
However, the EIA connector is just exactly what you would
expect ( 2-TX, 3-RX, 4-RTS, 5-CTS, 6-DSR, 7-GND, 20-DTR)
isn't it?
Antonio
At 12:35 AM 8/22/02 -0700, Eric Smith wrote:
>Jim Battle wrote:
> > 2) This one is a reverse job. The microcode board has quite a few mask
> > ROM chips. I don't care what the actual part number is, but I'm
> > hoping someone will say, "hey, that pinout is just like a ..." so that
> > I can find a prom programmer to read the thing. If I have to, I guess
> > I could build a parallel port dongle to read them. Here's what I
> > know:
> >
> > 24 pins
> > data out on pins 16-23
> > pin 1 is +5V
> > pins 2-8, 10, 11, 13, 15 are the address pins
> > pin 14 is either a chip select or output enable; active low
> > pins 12 and 24 are pulled up to +5; chip selects maybe?
> > pin 9 might be -15V (!)
> >
> > Embarrassingly, I can't find a connection to GND. unfortunately, I
> > don't know the backplane connections either, so I can't identify if
> > pin 9 is really -V or just an alternate ground (but I see a bypass cap
> > between the digital ground and this net, so it makes me think).
>
>PMOS parts typically ran on a single supply of around 12-15V. For TTL
>compatability, it was common to run them from +5V and -9V, with noground.
>
>+5V and -15V would effectively provide a 20V supply, which is more than
>was typical with PMOS, but not completely out of the question.
I had thought that maybe this was a possibility, and that input diodes
would clamp the output voltage to the digital ground, but I thought that
would be too hokey to be workable, and perhaps damaging to either the ROM
output or the clamp diodes on the input of the 75157 that the ROM is feeding.
Hmm, but then how is translation done on the inputs to the ROM? It is a
TTL device feeding the address, so the 0-5v swing (0.5v to 4+v) swing would
appear to be an input swing of +15 to +20.
I guess I'll have to tack down some wires so that I can look at the
voltages in an operating system...
> > One more thing, the manufacturer's logo and part prefix are "EA".
>
>"Electronic Arrays". They were pretty big in masked ROMs and keyboard
>encoders at one time. I'm not sure what eventually happened to them,
>but they were probably acquired by someone else.
Thanks for the great info. It looks like I'll have to build some kind of
tester myself to dump the ROMs.
-----
Jim Battle == frustum(a)pacbell.net
This may be a bit off topic.
I received a forwarded message that originated from lindows.com. They
are in a suit with Microsoft regarding the use of "Lindows,com".
Microsoft is suing Lindows for trademark violation. In the message,
Michael Robertson, with Lindows, is looking for old documentation of the
use of the word "windows" and "windowing" prior to 1983. I can't think
of a better resource than this list to find these references. The
relevant part of the forwarded message is quoted below.
Maybe some of the list members can provide the needed info to
lindows.com
Martin Marshall
________________quote from forwarded
message______________________________________________
Microsoft Corp. v. Lindows.com Update
Some of you have sent me email asking for an update on the battle with
Microsoft and wanting to
know how you can help. In case you missed it, Microsoft sued to shut
down Lindows.com earlier in
the year. It was a transparent attempt to stifle the inevitable
competition which Linux represents.
Their allegation was (and is) that they own the trademark for the word
"windows," maintaining that
no other company should be allowed to use the word "windows" -- not
even the "indows" portion.
Of course, there are hundreds of products and companies that use the
word "windows" - and
Microsoft has never filed suit against any of them. That's a huge clue
that this suit has little to do
with trademark confusion. (If you missed any part of the proceedings
to date, visit
http://www.lindows.com/opposition to read the court papers and
summaries.)
Many people have congratulated us, prematurely, on our victory. While
the judicial system did block
their request to shut us down, a trial is looming for April 2003. At
that time, the Judge (or jury) will
decide whether Microsoft has a valid trademark for the word "windows"
and whether the
Lindows.com name is confusing. In the interim, we're moving through
the legal process where
Microsoft is demanding, as part of the discovery process, everything
>from our business plan to our
list of partner companies. As you can imagine, it's challenging for a
39-person company to
compete with a Goliath that has hundreds of people--just in the legal
department alone. This is
where we could use a bit of help from our community of Insiders and
those on our mailing list.
While Microsoft can outspend us with high-priced lawyers and experts,
they cannot buy history. We
know, of course, that the word "windows" had been used in the industry
for years before Microsoft
adopted it in the early 1980s for the name of its windowing interface
product, Microsoft Windows
1.0. We could, however, use your help in gathering as much evidence as
possible to show the usage
of the words "windows", "window" and "windowing" before and after
1983, the date Microsoft first
filed its trademark application. If you have magazine or newspaper
articles, academic papers,
journal articles, product manuals, advertisements, textbooks,
dictionaries, or anything else that uses
the terms, we'd like to hear from you. We'd also like to hear from
anyone who had personal
experience in the industry during those early years and can recall the
history of the early
windowing products such as Xerox's Star, VisiCorp's VisiOn, Apple's
Lisa, Digital Research's GEM,
Quarterdeck's DesQ, IBM's TopView, and others. Please email all your
findings to
legal(a)lindows.com.
As always, thanks for all your help.
Michael Robertson
________________________________________________________________________________________________
Paul Braun, my e-mail to you keeps bouncing.
Contact me once you fix whatever ails your mail server.
Sellam Ismail Vintage Computer Festival
------------------------------------------------------------------------------
International Man of Intrigue and Danger http://www.vintage.org
* Old computing resources for business and academia at www.VintageTech.com *
Hope this is not a duplicate. The first one did not show up.
I have just obtained a Cromemco 64KZ board. This has 64K of RAM and
I'd like to test this out this weekend. Unfortunately, I don't have
any documentation.
There are 4 banks of RAM (16K x 8) Each bank is labeled "page0",
"page1", "page2" and "page3". There are also 3 8-pin dip switches:
I have a couple of photos at:
http://www.msdsite.com/vcomp/cromemco/photos.html
Since this is a 64K board and since there is other memory in my
system. I'm hoping this allows some sort of bank switching. But
without docs, I don't know how to use it.
I assume the Bank A/B allow setting which bank a particular 16K might
reside but am not sure. And the address lines of A15, A14 are a
mystery.
Is there a way to switch banks by writing to an I/O port? Location?
Can any of you help with an explanation how this works and how I
might use the switches?
Thanks in advance,
Mike
I have just obtained a Cromemco 64KZ board. This has 64K of RAM and
I'd like to test this out this weekend. Unfortunately, I don't have
any documentation.
There are 4 banks of RAM (16K x 8) Each bank is labeled "page0",
"page1", "page2" and "page3". There are also 3 8-pin dip switches:
I have a couple of photos at:
http://www.msdsite.com/vcomp/cromemco/photos.html
Since this is a 64K board and since there is other memory in my
system. I'm hoping this allows some sort of bank switching. But
without docs, I don't know how to use it.
I assume the Bank A/B allow setting which bank a particular 16K might
reside but am not sure. And the address lines of A15, A14 are a
mystery.
Is there a way to switch banks by writing to an I/O port? Location?
Can any of you help with an explanation how this works and how I
might use the switches?
Thanks in advance,
Mike
Noval 760 desk/computer on eBay. Like something out of Our Man Flynt,
half the desk tilts up to expose the CRT and cassette drive! Z80 based
and still working, somewhere in Kansas.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2047467277
No affiliation, and this one's so big I wouldn't even be interested if
it were nearby.
--Steve.
Steve Jones smj(a)spamfree.crash.com Arlington, Mass.
CRASH!! Computing (One domain element should be removed)
"Your information doesn't sleep. Why should your programmers?"
Please e-mail if you know of paper for a 9876A.
Thanks,
Kelly J Francis
HP Specialists Since 1978
Monterey Bay Communications
1010 Fair Ave
Santa Cruz, CA 95060
831-429-6144 Ph
831-429-1918 Fax
www.montbay.com
