New pcb design for S-100 prototype board available
ajp166 at bellatlantic.net
Mon Jun 4 17:41:36 CDT 2007
>Subject: Re: New pcb design for S-100 prototype board available
> From: "Ethan Dicks" <ethan.dicks at gmail.com>
> Date: Mon, 04 Jun 2007 17:38:18 -0400
> To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org>
>> Grant Stockly wrote:
>> > Someone built one of my Altair replica PCBs and went to great lengths to
>> > make sure the date code on the ICs was older than 1975. They also
>> > sourced the old brown cylindrical resistors.
>I've been known to do that, but for much more trivial examples - when
>I built my 1976-design Elf, I did the best I could on chips (my CPU
>and memory were of the period, but I have not yet tracked down a 74L00
>for the clock divider circuit), but I was happy to have a bin of
;) L00? I bet I have a few that are pre ELF.
>vintage brown cylindrical resistors for the pullups. I had to
>compromise on the regulator - the oldest one I could find in my junk
>bin was an LM340T.
I have a shopping bag of those resistor, really! the LM340 was period
and valid but, I have 7805s that are date coded 7951 (last week of '79).
Somewhere I came across a few baggies of them as they are handy.
I also have 1uS 2102s, 5101 and other old ram.
>Obviously, the computer doesn't care, but I wanted something that
>would have looked as if I had made it when I first got into computers
>as a kid. A complete indulgence to nostalgia.
:) they dont care. I tend to build new hardware using that old stuff
as I've had it for that reason, that is to build with.
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