Re: Plus/4 in a PC case?

From: Jason Petersen (
Date: 2001-08-04 03:29:10

Ruud Baltissen wrote:
> While building it up I stumbled over a site where a some one built a C64 in
> a small tower. Seeing the pics I only could think that when he closes the
> cover and powers up the only result would be a big FLASH.
> Unfortunally I didn't find that particular site ot it must be this one:
> If it is the same site, the tower went indeed FLASH and the guy built him a
> more decent one.
> Building a C= in a PC case you always wil run in two types of trouble:
> 1) mechanical dimensions
> 2) the 9 V AC some of theses C=s need.

My c64-desktop hack works quite well, thank you! This was my first case 
conversion, I'm not sure who had one go up in a puff of smoke.

There were indeed issues with the 9VAC and space considerations, but
what made it interesting! ;)

C64's use the 9VAC for serveral purposes:

1) Rectification to 5VDC and 12VDC
2) CIA TOD (time of day) clock
3) 9VAC available at User port
4) 9VAC drives the Cassette motor

So, to answer each of these issues:

1. Remove 7805 and 7812 regulators and wire 5VDC and 12VDC to the
   where the regulator's output pins were.
2. Make a simple 555 timer circuit if you need the TOD clock for some
   (I didn't do this; have not needed the TOD clock. Have yet to find
   software that uses it!!)
3. This is only needed for certain EEPROM burners AFAIK (If needed, you
   use a Zener diode to get 9VDC here, which should work fine)
4. I have no workaround for this. I think, if you're building a tower
c64 who 
   needs a stinkin' Datasette! (I know; certain people would argue with
this ;)

1541's, 1571's and 1581's are a snap, since they all take 5VDC and 12VDC

Your space requirements will depend on the case, of course. But no
matter what, 
plan on doing plenty of soldering! :)

I would be glad to answer any other questions on my case conversion.


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