From: Marko Mäkelä (marko.makela_at_hut.fi)
Date: 2006-08-31 08:04:58
On Wed, Aug 30, 2006 at 08:36:57PM -0700, Cameron Kaiser wrote: > Anyone seen a *partial* failure of CIA #2? Serial bus (including 128 mode > fast serial) and VIC banking all work normally, but user port communications > are busted (tried two different interfaces and terminal programs; hooked the > UDS-10 up to a Turbo232 and in that circumstance everything *does* work). > This is in a 128DCR; I haven't cracked the unit yet to examine the board. I have experienced partial chip failure. You can fry individual pins of chips. I once installed a cable between the user port of a Commodore 64 or 128 and the printer port of a IBM PC compatible. I accidentally plugged the user port connector upside down, and the PC (running GNU/Linux) crashed the moment I powered on the Commodore. The pin that got 9 volts AC obviously was fried, but the remaining pins were okay. Also, on a newer PC, I somehow managed to fry RTS and CTS on the serial port, perhaps by using a wrongly built cable. The TxD pin works. > Suggestions appreciated. Replace the CIA. Marko Message was sent through the cbm-hackers mailing list
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