Re: option ROM into a 3032

From: Gerrit Heitsch <*gerrit_at_laosinh.s.bawue.de*> Date: Fri, 29 Sep 2017 19:41:20 +0200 Message-ID: <c2507c25-72d0-c864-6042-5925884807fe@laosinh.s.bawue.de> · gerrit_at_laosinh.s.bawue.de

On 09/29/2017 07:19 PM, Ethan Dicks wrote:
> On Fri, Sep 29, 2017 at 4:20 AM, Francesco Messineo
> <francesco.messineo@gmail.com> wrote:
>>> I will also change the timing resistor and tantalum capacitor on the
>>> 555 reset circuit, I've noticed the reset signal isn't very well
>>> behaved (it resets randomly and sometimes doesn't release the reset
>>> line). I think the tantalum capacitor is shorting randomly to ground
>>> or the 1M resistor is intermittent.
> 
> It _should_ be a ceramic cap there (not all hard-shell shiny caps are
> tantalums) but if it's a large value and electrolytic, it's probably a
> tantalum.  I'd be less worried about the resistor failing, but that's
> an easy test.
> 
> Either way 555-based reset circuits do age poorly.

Do they? So far I didn't have a broken 555 reset circuit in a C64 or 
similiar.

  Gerrit

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