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| From | "Apple2Steward" <none@none.net> |
|---|---|
| Newsgroups | comp.sys.apple2 |
| Subject | Misbehaving Apple II+ -- Help! |
| Date | 2011-04-07 14:47 -0400 |
| Organization | A noiseless patient Spider |
| Message-ID | <inl0qc$r86$1@dont-email.me> (permalink) |
I left my Apple II+ running for a day with the clock (Thunderclock) program running, and when I went to check on it there was a smell like hot electronics and garbage on the screen. I shut it off for an hour and with a restart I got the power on light, and a noise from the speaker (but no real beep), no disk drive spinning and nothing on the screen. Same with all cards removed. I checked the power supply voltages at the connector (no load) and got 20 and 8 volts. I had a spare good power supply and swapped it in, and now get the power on light, no beep, and a screen filled with alternating horizontal bars and rows of question marks. I disassembled the computer and inspected the board but don't see anything obviously burned or swollen. My troubleshooting manual equates this situation with either a bad 6502, or bad F8 ROM. I don't have a spare F8 ROM, but do have an Apple IIe with a 6502B. So my questions are 1. Can I swap in the IIe CPU to test? 2. Are there other likely sources of failure? 3. Are new 6502s available if that's the problem? Suggestions would be most appreciated!
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Misbehaving Apple II+ -- Help! "Apple2Steward" <none@none.net> - 2011-04-07 14:47 -0400
Re: Misbehaving Apple II+ -- Help! Michael J. Mahon <mjmahon@aol.com> - 2011-04-07 14:29 -0500
Re: Misbehaving Apple II+ -- Help! "Apple2fan" <none@noone.net> - 2011-04-09 07:41 -0400
Re: Misbehaving Apple II+ -- Help! Michael J. Mahon <mjmahon@aol.com> - 2011-04-09 11:04 -0500
Re: Misbehaving Apple II+ -- Help! "Antony Mauget" <antony.mauget@capgemini.com> - 2011-04-09 07:38 +0200
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