RE: GEOS cartridge

From: Baltissen, GJPAA (Ruud) <>
Date: Tue, 18 Jun 2013 05:05:44 +0000
Message-ID: <>
Hallo Uffe,

> What is I that makes you doubt that is it a 7402 quad 2-input NOR IC ?

When data is involved, I'm used to see that the signal is generated at the _falling_ edge of PHI2. During writing my email I realised that, because there is not any data involved, PH2 = (H) and IO1 = (L) is good as well.
But what disturbed me was my IC tester saying it isn't a 7402. Unfortunately had other things on my mind yesterday, so I'll try the experiment of using marked ICs this evening.

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