From: B. Degnan (billdeg_at_degnanco.com)
Date: 2007-01-09 04:29:45
Hi - I am working on an SX-64 that has a blank screen upon boot up. It
will run some carts, but not all. I cannot load diskettes, but the light
does come on briefly upon start up like you would expect. I was able to
load and play Jupiter Lander cart, and more importantly run the C64/C128
Diagnostic Dead Test Cart (part # 314139-01). The diagnostic returned Zero
page OK, Stack page OK, RAM and sound tests OK. Interestingly I could not
get a different diagnostic cart to load, the "Commodore C-64 Diagnostic
Cartridge" P/N 314061-01. This is a nice diagnostic cart because it has an
SX-64 detection and diagnostic routine. I have other carts like Pac Man
and Spy Hunter that did not load either.
According to zimmers.net/commie/docs/sx64.txt the symptoms I have reported
indicate (but not conclusively) that the problem is with chip UD3 - the
251104-01 Kernal ROM.
Is this chip interchangeable with a regular C-64 Kernal ROM? I would
think... maybe? I know that there are versions of the chip and maybe only
the newer C64's would have something compatible. If so, what is the chip
number?
Does anyone have a spare 251104-01 or the equivalent for trade/sale? I
have plenty of regular C64's and other systems that I can borrow from.
Thanks.
Bill Degnan
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