Date: Fri, 4 May 2001 02:18:11 -0500
From: Brian Chase <bdc(a)world.std.com>
To: <classiccmp(a)classiccmp.org>
Subject: How many transistors in the 6502 processor?
Reply-to: classiccmp(a)classiccmp.org
And then it'd be rather fun to implement your very own 6502 using 74*
series logic chips.
Possible, but length of traces to wire all those together will keep
it to KHz range and needs few large boards that needs so much power
that hottest athlon cpu is low power by comparsion.
I have seen photos of apple IIe prototype laid out on early
pre-production logic board, one of that 40 pin chipset socket is
hooked to a equally same size board filled to the 4 edges with
tightly packed TTLs and few large ICs, I think it was shown in Byte
as well as few other publicatons. Large board full of chips vs. 40
pin IC, same thing...Amazing!
Side effect to this, you get less power requirement and can speed up
whole thing and more rapid signals due to very short traces and
on-die itself.
That is why TTL-based microcomputers and mainframes has massive PSUs
even using switching technologies and mini-tunnel wind effect to cool
everything. While same computing power can be on one 4pin chip
microcontroller and run on 1 AA directly for hours even weeks under
hottest sun.
Cheers,
Wizard