30 October 2011, 02:39 | #1 |
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A501 installed but not recognized
Greetings,
I've done quite a bit of searching on this and can't find any help. I acquired an A501 and installed it in my Amiga 500 with rev.5 motherboard. Booting up I see no additional RAM. The board looks perfect. I can't see any imperfections or problems with it physically. However, after installing I have no extra RAM, and in the CLI typing AVAIL I see Maximum chip 515864, fast 0, total 515864. There are no bent pins. Do I need to do something other than just install the board? It didn't come with a battery, but I believe it will work fine without one. Thanks for any help! - TommyROM |
30 October 2011, 03:43 | #2 |
Precious & fragile things
Join Date: Feb 2009
Location: Victoria, Australia
Posts: 1,946
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I had a similar issue with mine, bend one row of pins on the connector very slightly, like about 0.5 of a degree and this then makes sure that connections are sound.
Some isopropyl alcohol and a toothbrush are also good. |
30 October 2011, 08:14 | #3 |
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Join Date: Jul 2003
Location: Helsinki / Finland
Age: 43
Posts: 9,915
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If this doesn't work, consult your schematics and find out which pins / trace on the motherboard is _EXRAM. Use your multimeter to do a continuity check between the _EXRAM pin on the trapdoor slot and the _EXRAM pin on the Gary chip.
If the continuity checks out ok, try it with a known working Gary. If this doesn't work, try it with a known working trapdoor expansion / try your trapdoor expansion in another A500. And if these are not a possibility to you, send the device to someone who performs repairs or just get a new set from a car boot sale for next to nothing. |
30 October 2011, 17:11 | #4 |
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Loedown, when you said "one row of pins" that got me thinking. I only remembered seeing just one row. So I too a look and sure enough, there are two rows of pins. I'd installed the board using only one row. Once I positioned it so that BOTH rows of pins entered the connector, all the expected RAM showed up.
Man, I'm getting old. Walking away in shame now. Sorry guys. I should've known better. Thanks. - TommyROM |
30 October 2011, 18:58 | #5 |
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Join Date: Jul 2003
Location: Helsinki / Finland
Age: 43
Posts: 9,915
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Good to hear you got it working. I've done that a few times too, such a stupid moment when you realise what it was.
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