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From: GUBBINS@RADC-TOPS20.ARPA (Gern)
Newsgroups: net.micro
Subject: C64 Reset Circuit
Message-ID: <9433@brl-tgr.ARPA>
Date: Fri, 22-Mar-85 10:48:09 EST
Article-I.D.: brl-tgr.9433
Posted: Fri Mar 22 10:48:09 1985
Date-Received: Tue, 26-Mar-85 05:10:23 EST
Sender: news@brl-tgr.ARPA
Lines: 25

Here I go again checking into RESET circuits for other machines
I don't have...

Several persons and friends have asked me to check into a hardware
reset push button for their C64.  I have put RESETs on Z-150s and
looked into doing it on IBM-PCs.  I notice that C64 people, while
using their machine have to turn the beast off/on quite a lot.
A reset circuit would be much easier, and you would not have the 
TV/monitor freak with snow.  Rumor has it that RESET circuits that
plug into one of the C64s ports is available at a price, but this
blocks the port or something.

Taking a quick look at the C64 schematic in a bookstore last night,
The proper way to reset the C64 is to short capacitor C105 to
ground which will trigger the 556 timmer to one-shot the RESET(L)
line (thru a 7406 open collector inverter).   A more nasty way
to do it is to grab this RESET(L)  (RESET-BAR) at one of the ports
and ream it to ground for the time that the 556 would.

Has anyone put a reset in their C64?  Is it really worth it and the
trouble (and the 1/4" hole in the case)???

Thanx,
Gern
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