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Old 08-04-2007, 10:14 PM   #1
zonaps2
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Default A500 doesn't work with RAM expansion... HELP
Hi,
I have an Amiga 500 and a 1084s commodore monitor since 1990,
It was stored for a long time 'til a week ago.
I plug in all and still works!, but I have to remove the trapdoor 512k RAM expansion.

Screen turns yellow at the booting sequence when RAM expansion is on the Amiga.

RAM model is MicroBotics M 501, I took the battery off 'cause it seems dead and cleaned the board, looks preety ok to me, no corrosion.

The Amiga works fine without the expansion but half of my games are useless now.

Can I do something to repair it?
Or is a problem on the Amiga motherboard?

(Pictures were taken with a cellphone and a scanner, sorry! ) :roll:



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Old 08-05-2007, 02:34 AM   #2
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Default Re: A500 doesn't work with RAM expansion... HELP
A 512K trapdoor expansion is hardly worth repairing; it's probably much easier to get another one.
Otherwise it's seems cleaning up battery mess isn't enough. You'd have to fix any damaged traces. A yellow screen does indicate a RAM problem (an exception takes place before the OS setup has progressed far enough to e.g. display a Guru) - I assume, you've got a 512 K chip and 512 K 'fast' config, so the OS data is put into expansion RAM - which isn't working correctly and crashes the machine.
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Old 08-05-2007, 04:58 AM   #3
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Default Re: A500 doesn't work with RAM expansion... HELP
The underbelly of the ram expansion board does look pretty damaged to me, right underneath the place the battery sits - looks like acid damage too.

Given the dangerous nature of these chemicals, and the price of a A500 ram expansion, you'd be well advised to steer clear from repairing it and just get yourself a new expansion off ebay for a tenner...
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Old 08-05-2007, 11:21 AM   #4
zonaps2
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Default Re: A500 doesn't work with RAM expansion... HELP
Ok, thanks for responses, I'll get a new one from ebay, since I'm in Uruguay shipping cost always rises the price of the items.

Another problem:
I've noticed that one of the sound channels isn't working on the monitor, I'll try to disassemble later.:-?

Thanks
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Old 08-05-2007, 11:31 AM   #5
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Default Re: A500 doesn't work with RAM expansion... HELP
Looks pretty ok? No corrosion??

You've got to be joking!
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Old 08-05-2007, 12:13 PM   #6
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Default Re: A500 doesn't work with RAM expansion... HELP
I don't know much about electronic components and it seems to me that just the green layer is peel off.
But looking at it now you're right, looks pretty damaged.
My mistake!
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