C64 reset button

[Chrom_]

Hi all,

apart from the usual cartridges that also feature a reset switch, I
couldn't find any really usable schematic online to build a reset
switch for a breadbox C64.

There is this but it's in dutch, and not very clear scan:
http://home.tiscali.nl/wimwubs/Commodore-64/artikelen/resetknop.jpg

There is this, but no schematic, just a description with no diagram
(not very usual, is it?)...
http://personalpages.tds.net/~rcarlsen/cbm/reset64.txt

So it seems both a DIN port version and a motherboard version are
feasible. I would probably go for an internal mod so that the DIN port
is still free for a drive to be attached. Both seem really easy to
make though.

Is there any better resource online? Has anyone made a reset mod and
wants to share the experience?

Mauro

[siemap...@quicknet.nl]

On 8 jun, 22:12, Chrom_ <maurogra...@gmail.com> wrote:
> Hi all,
>
> apart from the usual cartridges that also feature a reset switch, I
> couldn't find any really usable schematic online to build a reset
> switch for a breadbox C64.
>
> There is this but it's in dutch, and not very clear scan:http://home.tiscali.nl/wimwubs/Commodore-64/artikelen/resetknop.jpg
>
> There is this, but no schematic, just a description with no diagram

> (not very usual, is it?)...http://personalpages.tds.net/~rcarlsen/cbm/reset64.txt

>
> So it seems both a DIN port version and a motherboard version are
> feasible. I would probably go for an internal mod so that the DIN port
> is still free for a drive to be attached. Both seem really easy to
> make though.
>
> Is there any better resource online? Has anyone made a reset mod and
> wants to share the experience?
>
> Mauro

The description of Ray Carlsen is....very usefull.

Groetjes, Sam.

[Anssi Saari]

Chrom_ <mauro...@gmail.com> writes:

> apart from the usual cartridges that also feature a reset switch, I
> couldn't find any really usable schematic online to build a reset
> switch for a breadbox C64.

What's the big? Grounding the CPU reset line any way you want works.
C64 schematics are available. External port pinouts are even in the
user manual and there's plenty of space to solder a wire on those
pads.

So, just do it.

[me]

"Chrom_" <mauro...@gmail.com> wrote in message
news:c792c507-d885-4740...@t10g2000vbg.googlegroups.com...

http://artofhacking.com/IET/C-64/RESET.C64

"Pin 3 of the User Port is on top, third from
the left when viewed at the back of the computer.

This particular pin runs to
a feed-through hole that connects a trace on the bottom of the PCB to a
trace on the top. Using a 22 gauge wire, you can simultaneously melt the
solder and insert the wire in this hole. Using another 22 gauge wire,
connect it to the GROUND path that runs along the back side of the PCB.
This ground is rather large in area and can be connected to in quite a few
places. Take the other ends of these two wires and attach them to a
momentary SPST contact normally-open push button switch. Radio Shack sells
one that works very well. It mounts in a 0.25" hole. Their P/N 275-1547.
Mount this switch wherever in the case of the computer you like."

[Brandon Staggs]

"Chrom_" wrote on Mon, 8 Jun 2009 13:12:04 -0700 (PDT):

> http://personalpages.tds.net/~rcarlsen/cbm/reset64.txt

I added a reset button to one of my C64s with the above information.
Works perfectly and doesn't use up ports on the computer.

--
-Brandon
http://www.brandonstaggs.com/c64.html

[daniel...@ucd.ie]

On Jun 8, 9:12 pm, Chrom_ <maurogra...@gmail.com> wrote:
> Has anyone made a reset mod and
> wants to share the experience?

http://cdn-write.demandstudios.com/upload//3000/500/80/5/33585.jpg
For the amount of times you'll use it, it makes as much sense. Just be
careful to identify the points the first few times and you won't bat
an eyelid at it after a while.

[bith...@bithunter.eu]

It's quite easy to build in a reset switch into a C64, but a simple
reset line grounding resets only the computer side (in a C64C - I
don't know the 'breadbox' C64). It's a much more professional
solution, when the switch resets the IEC bus also. It can be done by
grounding the pin5 at U23.

[Lars Haugseth]

Ah, that brings back memories, thanks!

For something a little more sophisticated, try this one:
http://www.larshaugseth.com/reset-switch.jpg

--
Lars Haugseth

[Sam Gillett]

"Lars Haugseth" <nj...@larshaugseth.com> wrote ...

Yes, that one is a very sophisticated example of retro-technology! :-)

I wish that I had invented something like that back in 1982. I might be rich
and famous today!
--
Best regards,

Sam Gillett

Change is inevitable,
except from vending machines!

[winston...@yahoo.com]

On Jun 9, 1:41 pm, "bithun...@bithunter.eu" <bithun...@bithunter.eu>
wrote:

Home Computer Magazine published an article about adding a reset
switch around 1982 or 1983. They were inundated by letters complaining
that it actually reset everything. The complainers were apparently
expecting some sort of super Run/Stop/Restore setup - in other words,
you'd hit reset and pop back into your Basic program.

[Chrom_]

Thanks guys, I've finally decided to use the original Ray Carlsen
setup ( http://personalpages.tds.net/~rcarlsen/cbm/reset64.txt ). It
works beautifully indeed.

Mauro

[JBones]

i think i used the same one... lol...

[me]

"JBones" <jbon...@gmail.com> wrote in message
news:a7064a13-9b94-422a...@e20g2000vbc.googlegroups.com...

Many..many years ago pops.!?

[Sam Gillett]

<daniel...@ucd.ie> wrote ...

You guys are forgetting about the reset system built into every C64. Geeze,
and I thought I was getting old and forgetful! :-)

Just turn off the power switch, wait a couple of seconds, then turn it back
on. Amazingly, the C64 is now in a fully reset status! BTW, any attached
drives that are turned on will also be reset.

Another advantage to this method, so carefully thought out by Commodore
engineers, is that there are no paper clips, hairpins, or other auxiliary
devices to get lost. :-)