> From: "Chandra Bajpai" <cbajpai(a)attbi.com>
> To: <cctalk(a)classiccmp.org>
> Subject: RE: collecting silicon wafers
> Date: Wed, 12 Mar 2003 08:02:08 -0500
> Reply-To: cctech(a)classiccmp.org
>
> I got to ask this...what's a wafer mask...what's it look like?
>
> -Chandra
It is the layout used to produce designs on a silicon wafer. They are
usually square, and made of quartz (to minimize UV dispersal), with a
coating of etched chromium on one side. When photoresist has been
deposited on a wafer, the wafer is loaded into a mask aligner. This
allows the mask to be aligned with existing patterns on the wafer
before being exposed to UV light. Once the exposure is complete, the
wafer is developed, and a pattern of hardened photoresist is left
behind. This is then used to control deposition areas in later steps
of the process.
-Peter
--
Peter Sahlstrom __ __ ( ) ____ _____
CMOS Process Technician / \ / \ _ / __ \ / ___/
GT Microelectronics Research Center / /\ \/ /\ \ | | / _ _/ / /__
peter(a)stormlash.net /_/ \__/ \_\ |_| /_/ \_\ \___/
>From: "Hans Franke" <Hans.Franke(a)mch20.sbs.de>
>
>> >According to my 1983 Synertek book, the SY6507 _is_ a 28-pin 65xx CPU with
>> >8K addressing. The only video controllers they list are the SY6545, SY6845,
>> >SY66450 and SY66550.
>
>> Hi Jim
>> This is what Eric Smith tells me as well. As I told
>> him, it doesn't make much sense. The board has a 6502
>> as well as the 6507 with the data lines tied together.
>> I guess they could use opposite phases or something.
>> I was tracing down the sync signals for the video
>> and they seem to be coming from this part??
>
>Now it would be interesting where they go. Maybe the
>6507 CPU get's an interupt every line, or screen ?
>
>> Now I have a mystery to solve?
>
>That's all what classic computing or computing in
>general is about.
Hi Hans
Both Eric and Jim were right. It is a 6507 uP. I looked
some more at the board and did some tracing. I'll have to
admit, I'd never have thought of it. There is an address
mux going to the code ROM. The clock input are in fact 180
degrees out of phase ( Q and Q\ of a JK-flop ). The sync
signals come from the high order address bits as well.
The code for making a sync signal is just to do a load
>from the higher address. Now, I have to get the code
out of the ROM so I can see exactly how it was done.
It would seem that the 6507 just runs a loop that makes
the needed strobes and the 6502 does the keyboard scan
and RS-232.
Very clever! It makes one think how simple things could
be today using several PIC chips to do relatively complex
task and replace expensive dedicated chips.
Dwight
I need the little spring-loaded plastic cover on the ASR-33 tape reader that
holds the paper tape in position over the sprocket and contacts. The whole
thing is missing (the cover, spring and latch).
Also my tape punch is missing the rectangular cover with the four clear
plastic pushbuttons. If anyone has spare parts to sell, please contact me
offlist at: charlesmorris at direcway dot com.
thanks
Charles
Guys,
I work for a small consulting company that creates software for
distribution. We're a low volume operation, and don't have many employees.
I've been trying to rein in the whole development process to streamline it
over the last couple of years, and now I need to streamline the methods by
which we create documentation for our products.
I'd love to know what systems people on this list use for creating software
documentation (manuals, etc.), and I'd love to hear any recommendations for
systems that allow for concurrent access (kinda like CVS), change approval,
revision control, etc, etc.
Are there any good open-source solutions available? I've been searching and
gathering information, and I'd really appreciate hearing the experiences of
others on this list.
Thanks!
- Matt
Matthew Sell
Programmer
On Time Support, Inc.
www.ontimesupport.com
(281) 296-6066
Join the Metrology Software discussion group METLIST!
http://www.ontimesupport.com/subscribe_t&c.html.
"One World, One Web, One Program" - Microsoft Promotional Ad
"Ein Volk, Ein Reich, Ein Fuhrer" - Adolf Hitler
Many thanks for this tagline to a fellow RGVAC'er...
On 10 March at 10:10am, Witchy wrote:
[Dialling]
> I've been told they do tone dialling too, based on the unsupported DIP
> switches in the telephony module. Haven't tried it though;
> all of my OPDs
> are downstairs in boxes.
The DIP switches aren't unsupported, they're actually documented...
[Voice answering]
> I'm sure it can respond to different numbers with different
> messages though,
Not different numbers, Caller ID simply didn't exist (probably anywhere
in the world) in 1986. I think (not tried this) that it can respond with
a different message on each line, and it can change messages depending
on the time of day - but not day of week...
> also it *can* say good morning, as well as things like 'I'm
It definitely can't say "good morning", as "good" isn't in the
vocabulary :)
> away getting
> head with my secretary on holiday' :) There was a competition
Hehe - I must try that.
> on radio not
> so long back (Chris Moyles or Scrawn&Lard on Radio1 IIRC) where people
> actually recorded their OPDs saying rude things, so I just
> *had* to have a
> go myself....hehe.....
Erm, "not so long ago"? Sort of like 1987, maybe?
[Testing the telephony module]
> Be easier if I tested it up here first. Just got to dig out
> the low-res
> monitor from its hiding place....the hi-res one is too high up and
> underneath too much other stuff for me to easily get!
Humph. I just knew I wasn't going to get a free module that easily ;)
What's this about a hi-res monitor? I assume you mean a larger one than
the 9" B&W which seems to be the norm for these machines? Is it colour?
I'd like to get a pin-out of the monitor/power connector - I'm not sure
if it's in any of the manuals I've got.
> I don't recall either of mine being any slower than the QL, though
it's a
> few months since I last played with one. I just wish I had some
> documentation for 'em.
I can scan mine in if you like. I don't believe I'm doing anything on
Sunday yet...
>From: "Vintage Computer Festival" <vcf(a)siconic.com>
>
>On Tue, 11 Mar 2003, Dave Wilson wrote:
>> My only anxiety is that the general interest in collecting
>> silicon may take off in a big way before I have managed to build
>> up a workable stock.
>
>Indeed. Just try to keep a "Silicon Wafers" category from being created
>on eBay for as long as possible and you'll be in the clear for a while :)
>
Hi
Even wafer collecting can have monetary value. A while back, at
the beginning of the last Middle East action, there was a military
requirement for mil spec TTL parts. I don't recall which but
I believe it was 74139's that were in short supply. Anyone
with a wafer of these could just about name their price.
The fact is that most companies consider the wafers as
proprietary information. They would rather destroy it or send
it back to the foundry to be recycled. Wafers that do make
it to the outside world are usually from some company that
has shut down and had a warehouse of overstocks.
Dwight
Dave,
Several members of this list who do not agree with the views of a certain
obnoxious self appointed "spokeman" for vintage computer enthusiasts forwarded
me your post.
I decided to take a break from busting up vintage computers with a sledge
hammer to
"mine" the chips out of them to reply;).
Many chip collectors also collect whole undiced silicon wafers. There are a
growing number of chip collecting forums where you can buy and trade wafers
with other collectors.
If you are interested, send me an email and I send you some links.
You may also want to consider looking into chip collecting. It's a great way
to
keep old chips out of the smelter.
That item went for $880.00. Seems like a lot to spend.
>I contacted Stephen last night to see what he was up to. As it turns
>out, the kit on eBay is one of his that the buyer probably gave up on or
>never had time for.
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>From: "Jim Kearney" <jim(a)jkearney.com>
>
>> This is what Eric Smith tells me as well. As I told
>> him, it doesn't make much sense. The board has a 6502
>> as well as the 6507 with the data lines tied together.
>> I guess they could use opposite phases or something.
>> I was tracing down the sync signals for the video
>> and they seem to be coming from this part??
>> I do have a schematic someplace but I haven't located
>> it yet.
>> Now I have a mystery to solve?
>
>Possibly it's a variation of the Lancaster TVT (Cheap Video) design?
>
>What is it?
>
Hi
Again, just what Eric said. It is for a KTM-2.
This is Synertek's keyboard/video board.
Dwight
