cng@burdvax.UUCP (02/28/84)
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Does anyone have a method for connecting a reset switch to the C64? I've
become pretty frustrated with having to turn the thing off every time it
visits the Twilight Zone.
Homebrew and/or commercial kit would be acceptable.
Tom Albrecht
--
Burroughs Corp. ...{presby|psuvax|sdcrdcf|bpa}!burdvax!cng
P.O. Box 235 (215) 269-1100
Downingtown, PA 19335porter@inuxd.UUCP (J Porter) (02/29/84)
There is a reset line on the serial bus and on the user port if I am not mistaken. Simply connect a normally open momentary push button switch to ground. Jeff Porter (inuxd!porter)
miller@uiucdcs.UUCP (miller ) (03/02/84)
#R:burdvax:-152300:uiucdcs:36100057:000:518 uiucdcs!miller Mar 1 16:40:00 1984 If you want to get fancy, rather than simply connecting reset to ground as Jeff suggested, you can connect your switch to a one shot. You can look in the back of the Programmer's Reference Guide for where/how to add this as they have the diagrams back there. A little known side note: the restore key *alone* causes a nonmaskable interrupt on your c64. No, not run/stop and restore - just restore alone. Once the NMI has occured, the software checks to see if the run/stop key is down. A. Ray Miller Univ Illinois
daemon@decwrl.UUCP (03/02/84)
From: pogo::lawrence Pin #3 on the user port is reset. Connect a momentary contact switch from this pin to ground to reset the Commodore. Jim Lawrence Colo Springs
cuda@ihuxf.UUCP (Mike Nelson) (10/17/84)
I remember reading about a reset switch in one of the various c64 magazines earlier this year. It was in response to an article which mentioned shorting pins 1 and 3 of the I/O connector to cause a cold restart by grounding the reset line. This particular reset switch had a diode, a couple resistors, and a cap or two. The guy that sent it in said that just shorting the reset line to ground could damage the computer. Questions: 1) Has anyone had trouble with just shorting these two pins? (outside of shorting the wrong two together.) 2) Does anyone know what I am talking about? (Do I?) I think I've found the article the guy responded to. It is in the Dec. or Jan. Compute's Gazette in the Horizon 64 ( or 64 Horizon ) section. I've looked through all of my other CGs and can't find the schematic of the suped-up switch. Thanks. Happy Hunting Mike Nelson AT&T Bell Labs ihuxf!cuda
miller@uiucdcsb.UUCP (10/19/84)
My c64 has a one-shot which drops the RESET line low. This provides a warm start so that you can recover from a fatal crash without turning your machine off & thus losing what's in memory. I've known others, however, who simply shorted the RESET line to ground (active low as I recall). They haven't had any problems, but I wouldn't hold the switch down too long if I had that configuration on my machine. The back of your PRG will have a circuit which you can modify if you want to do this. Their junk is for power up, but can be changed a bit. Just trace the RESET line back out & notice where it triggers it. A. Ray Miller Univ Illinois