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Misbehaving Apple II+ -- Help!
- Subject: Misbehaving Apple II+ -- Help!
- From: "Apple2Steward" <none@none.net>
- Date: Thu, 7 Apr 2011 14:47:04 -0400
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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!