From: Scott McDonnell (netsamurai_at_comcast.net)
Date: 2007-01-09 04:59:11
I would definitely agree with that diagnosis. However, before you start
looking for a replacement, have you opened the SX-64 and made sure all
the chips are pushed into their sockets completely? The case of the
SX-64 is pretty good at twisting the boards and eventually popping chips
out of sockets. Especially after shipment!
Scott
-----Original Message-----
From: owner-cbm-hackers@ling.gu.se [mailto:owner-cbm-hackers@ling.gu.se]
On Behalf Of B. Degnan
Sent: Monday, January 08, 2007 10:30 PM
To: cbm-hackers@ling.gu.se
Subject: WTD: 251101-01 Kernal ROM chip for SX-64 (UD3)
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
Message was sent through the cbm-hackers mailing list
Message was sent through the cbm-hackers mailing list
Archive generated by hypermail pre-2.1.8.