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r/apple2

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Posted by2 days ago

外围体育投注Does anyone know what might be the cause of jumbled characters on an Apple ] [e screen? The computer died about 25 years ago, going from perfect working order to no power. I've traced the original fault to a cap that failed short, so I've replaced all the tantalum caps. The machine ow powers up, by there is no beep, no way of getting into the self test and junk characters on the screen. The board is clean and I've re seated all the ICs. I've not gone too far into diagnosing this yet, but if anyone recognises the fault and has any suggestions it would be a great help.

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Posted by3 days ago

Recently picked up a IIe and I've been having strange issues with it. Graphics artifacts, numerous checksum errors when trying to import cassette images. Ended up running the built-in diagnostics and it's reporting memory errors:

外围体育投注RAM 0 1 0 0 0 0 0 0

and intermittently

RAM 1 1 0 0 0 0 0 0

外围体育投注I don't have any extra 4264-15 chips handy, but figured I could kill two birds with one stone and move some chips around and solder in some sockets. After switching some of the chips around I fired up and re-ran diagnostics. Same result as before.

Any ideas where I should look next? Tried reseating the MMU and CPU and still no change.

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5 comments
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Posted by4 days ago

外围体育投注The //c boots up, but any floppy I put in the drive either runs forever making a repeating pattern of sounds or boots to asterisks or garbage. I put the disks in my //gs and they work fine. Does someone repair //c drives?

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Posted by6 days ago

外围体育投注Hello does anyone know where I would be able to find a replacement HAL chip for my P.A.L. Apple 2e I can find a replacement for the US 2e (341-0170-A) but I need a 342-0176B any suggestions appreciated.

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Posted by7 days ago
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Posted by7 days ago
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About Community

The number one resource on Reddit for Apple ][, Apple II, or even Apple 2... however you spell it. This subreddit is discussion and tech support of Apple II hardware, software, and emulators.
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Created Jan 12, 2010
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外围体育投注The Retro Gaming Network consists of subreddits dedicated to classic consoles, computers, handhelds, and old school gaming in general.

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