Re: JiffyDOS and surface-mounted chips

From: Marko Mäkelä (
Date: 1998-10-10 12:20:41

On Sat, 10 Oct 1998, Peter Karlsson wrote:

> The problem is that my C64 (newer model, bought in 1988) has surface-mounted
> chips...

Are you sure that they are surface-mounted?  I have never seen
surface-mounted chips in a C64.

> I was thinking of installing the JiffyDOS chip piggy-back on the
> existing kernal chip, and somehow removing the Chip Select signal from the
> existing chip, and feeding it to the JiffyDOS chip instead.

You can desolder a Chip Select or Output Enable signal from the original
chip and connect it to +5V or ground, whichever is the inactive level. 
Then you can piggy-back the JiffyDOS chip on the ROM.  But I think that it
would be much cleaner to desolder the old ROM chip.  It's only 24 or 28
pins: piece of cake!  (Guess who upgraded a 128k REU to 512k by
desoldering all 16 memory chips (16 pins each)?)


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