27 Mar
2002
27 Mar
'02
12:49 p.m.
Well, that's as good an excuse as any.
There are always "other" reasons. I happened to think of this one (a) because
I've been asked to do things that way, and (b) because someone recently
mentioned it. I've seen plenty of cases where it would have saved dozens of
vias to lay the board out without scrambling the address/data lines to the
EPROMs.
Dick
----- Original Message -----
From: "Tony Duell" <ard(a)p850ug1.demon.co.uk>
To: <classiccmp(a)classiccmp.org>
Sent: Wednesday, March 27, 2002 2:33 PM
Subject: Re: ZX81 and 6116
>
> A lot of manufacturers have thought it "clever" to rearrange the address
and
> data lines, on an EPROM, for example, in order to
obfuscate their
firmware.
Since it's so easy to figure out, I've always thought it was not done for
obfuscation, but to make it easier to lay the PCB out in the first place.
-tony