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: email@example.com [mailto:firstname.lastname@example.org] On Behalf Of B. Degnan Sent: Monday, January 08, 2007 10:30 PM To: email@example.com 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
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