22 Mar
2000
22 Mar
'00
11:30 a.m.
I had a C64 on which I installed a reset switch into my HES-MON assembler
cartridge. I used it for several years that way. I eventually gave the
64 to my nephew and I believe the machine still works to this day,
although I doubt the HES-MON got much use after I gave it away.
I did manage to fry a couple of sound chips, probably by feeding too many
nasty signals through the (band-pass?) filter input on the sound DIN.
In college I picked up a discarded Televideo 950 terminal with a 6502
processor. It had a habit of hanging on invalid escape codes, so I
soldered a momentary push button switch on its reset pin. It also
continued to work up to being discarded.
The capacitor probably would have been a good idea in either case.
Paul
On Thu, 23 Mar 2000, Tony Duell wrote:
Quite, I've got to say this is an EXTREMELY BAD way of resetting a C64 in my
experience.
Yes, but I would have thought that the main problem is that you're
effectively shorting an output (namely the output of the chip that
normally generates the reset signal) to ground. This is not generally a
good idea.
I am suprised it was the processor that failed, though. AFAIK, the
processor in a C64 never outputs anything to the reset line.
There's a fairly easy modification IIRC that adds a reset switch in
parallel with a capacitor in the reset circuit. This is a safe way to do
it. It's fairly obvious how to do this given a C64 schematic. If anyone
is seriously interested, I'll see what I can find.
-tony