19 Jan
2003
19 Jan
'03
1:39 a.m.
No, I meant that the board only has components on one side, unlike a few
custom through-hole boards I've seen, and more and more surface mount type
boards.
I wonder what CAD system they used to lay it out with.
--John
-----Original Message-----
From: cctalk-admin(a)classiccmp.org
[mailto:cctalk-admin@classiccmp.org]On
Behalf Of Sellam Ismail
Sent: Sunday, January 19, 2003 09:07
To: cctalk(a)classiccmp.org
Subject: RE: Apple 1 schematics
On Sun, 19 Jan 2003, J.C.Wren wrote:
http://www.vintage.org
* Old computing resources for business and academia at www.VintageTech.com
*
Since this is a single sided board, as far as
components go, the
I assume you mean single layer?
bottom side would be easy. Scan it. The top side
would be
harder, but
given that the majority of the parts are .3"
wide, with the
schematic, a
lot of the routing can be inferred. And while I
haven't
looked closely
at an Apple I board, the trace widths should be
pretty
wide, by todays
standards. So by doing an overlay, and perhaps
using some
bright lights
for manual verification, it seems that very near
replica
could be made.
Check out these photos:
http://vintage.org/special/apple-1/apple-1-front.jpg
http://vintage.org/special/apple-1/apple-1-rear.jpg
From the front photo you can see that the
connecting traces are very
tight. However, within proximity of the ICs, they are
inferable, but it's
not always obvious. I know this because I've looked at an
Apple-1 a few
times and pondered how challenging it would be to discern the traces
undeather sockets. If you look at the socket on the far left of the
board, right above the Apple Computer 1 wording, you'll see
what most (if
not all) of the sockets on the board look like. There's no way to see
underneath without removing the socket.
All that being said, I imagine with a close scrutiny of the board and
cross-referencing it with the schematics, one can acrruately make the
necessary inferences.
Sellam Ismail Vintage
Computer Festival
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International Man of Intrigue and Danger