baffoni@aludra.usc.edu (Juxtaposer) (03/23/91)
My ST started flaking out on me just recently. After warming up, for 1/2 hour to 15 min., it would bomb out or become a nasty blob of random speckles. So I used a memory checker on my memory and it is an intermittant problem with the high-bank bit 2: it expected A5A5 and got A7A5, or it expected E4BC and it got E6BC. Anyway, I want to desolder the bad 256k chip, but I don't know which of the 16 it is. I have an original 520ST with RF modulator, and the board is Revision B. The addresses that it failed at were 0007FF74 to around 0007FD8C. At present I only have 512k of memory. Please, if anyone can tell me the correct chip, and maybe a chart for future reference, PLEASE EMAIL ME! I think I'll go nuts without my ST! Thank you all MUCH in advance! -Mike baffoni@aludra.usc.edu or mbaffoni@skat.usc.edu