Re: C64 reset timing

From: groepaz_at_gmx.net
Date: Mon, 25 Jan 2021 20:58:11 +0100
Message-ID: <1942348.IDvDuAF1LB_at_rakete>
Am Montag, 25. Januar 2021, 20:46:42 CET schrieb silverdr_at_wfmh.org.pl:
> When testing BeamRacer prototypes on as many different C64 / SX64 boards as
> possible I remember encountering a problem with one machine, which we had
> to take into account and work around. The root issue with that particular
> board was that upon power-up the _RST (reset) line was not asserted for
> some prolonged time but became inactive (almost?) immediately once VCC
> stabilised. This didn't seem to affect the way the machine worked and I
> probably wouldn't notice it at all if it wasn't causing issues with our
> add-on. While now I am yet to find that particular machine back and analyse
> it thoroughly, I am wondering that's something, which could be described as
> a common failure or feature? Has any of you in the know encountered
> anything similar?

sounds like a broken capacitor in the reset circuit :)

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Received on 2021-01-25 21:02:04

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