Path: utzoo!utgpu!water!watmath!221.162.fido!Geoffrey_Welsh
From: 221.162.fido!Geoffrey_Welsh@watmath.waterloo.edu
Newsgroups: comp.sys.cbm
Subject: Re: C64 hardware reset
Message-ID: <17327@watmath.waterloo.edu>
Date: 5 Mar 88 15:01:22 GMT
Sender: ugate@watmath.waterloo.edu
Lines: 28


 > From: jon@csd4.milw.wisc.edu (Jon George Seidl)
 > Message-ID: <5061@uwmcsd1.UUCP>
 > Date: 4 Mar 88 21:32:53 GMT
 
Jon:
 
   There was a huge debate in the FidoNet "CBM" conference on the pros 
and cons of shorting RESET to GROUND. The schematics (or at least the ones I
have!) show that the RESET line is fed through an open-collector driver,
meaning that you can hold RESET low as long as you like and not harm any
chips.
 
   Some claimed that their C64s did not use OC drivers on the RESET 
line; I doubt the accuracy of those claims.
 
   Bottom line: short the RESET line to GND for as short a period as 
possible. If you feel like a genuine hacker, try shorting pin 8 of U20 (a
556) to GND - that's the trigger pin of the timer. It might 
(should?) reset the machine and it's driven through a 1 meg resistor 
to +5v and a 0.1 uF cap to GND, so shorting it should be completely harmless
but generate the required RESET signal.
 
   Geoff ( watmath!fido!221.171!izot )
 

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