A500 - resurrection or pit of despair?

[rubber_jonnie]

Well mine had green goo on the pins, and though I ended up removing the connector to clean in my ultrasonic bath and resoldering, but there was nothing I'd class as bad corrosion and as you know it turned out to be a bad RAM IC on the expansion board.

I'm sure it'll be fine. My clock/RAM board has a CR2032 so should be relatively immune from leakage now.

The working one doesn't have space for a battery, jut the 4x RAM chips, a switch and some resistor packs...

The other one I'm about to test did have a Varta but has allegedly been repaired...we will see...

Good luck with that

[JezC]

Thanks @rubber_jonnie

I've removed the metal shield from the other trapdoor RAM and it's now being tested...detected OK as 1/2 MEG slow RAM...

It's up to round 10 of testing already so I'll leave it running for a while to see the results!

[rubber_jonnie]

Thanks @rubber_jonnie

I've removed the metal shield from the other trapdoor RAM and it's now being tested...detected OK as 1/2 MEG slow RAM...

It's up to round 10 of testing already so I'll leave it running for a while to see the results!

Good stuff. Is it an issue 6? If so you can boost the chipram with a trapdoor expansion quite easily.

[JezC]

Good stuff. Is it an issue 6? If so you can boost the chipram with a trapdoor expansion quite easily.

Nope Issue 5 B52 Rock Lobster, same as you bought from me.

The other RAM card has now gone through more than 150 cycles (testing both 0.5 Meg blocks) so might be OK...can I be bothered to fit a battery for the RTC on it though?....

I might even get the last A500 out of its box to check if that can be resurrected as well...especially now I appear to have two working trapdoor RAM cards

[rubber_jonnie]

Good stuff. Is it an issue 6? If so you can boost the chipram with a trapdoor expansion quite easily.

Nope Issue 5 B52 Rock Lobster, same as you bought from me.

The other RAM card has now gone through more than 150 cycles (testing both 0.5 Meg blocks) so might be OK...can I be bothered to fit a battery for the RTC on it though?....

I might even get the last A500 out of its box to check if that can be resurrected as well...especially now I appear to have two working trapdoor RAM cards

Well mine is a Rock Lobster, but I could have sworn it was issue 6. Will look next time I'm in it.

[rubber_jonnie]

Good stuff. Is it an issue 6? If so you can boost the chipram with a trapdoor expansion quite easily.

Nope Issue 5 B52 Rock Lobster, same as you bought from me.

The other RAM card has now gone through more than 150 cycles (testing both 0.5 Meg blocks) so might be OK...can I be bothered to fit a battery for the RTC on it though?....

I might even get the last A500 out of its box to check if that can be resurrected as well...especially now I appear to have two working trapdoor RAM cards

Good stuff

[JezC]

Well mine is a Rock Lobster, but I could have sworn it was issue 6. Will look next time I'm in it.

Maybe I'm struggling to read it properly under the label...but there are 16 RAM chips on the motherboard

And I am definitely not an Amiga expert by any means!

[rubber_jonnie]

Well mine is a Rock Lobster, but I could have sworn it was issue 6. Will look next time I'm in it.

Maybe I'm struggling to read it properly under the label...but there are 16 RAM chips on the motherboard

And I am definitely not an Amiga expert by any means!

Oh, mine has 4 with space for another 4, Typical, I have no photos of that part of the board.

[JezC]

Sounds like I passed you the better one then

[rubber_jonnie]

Sounds like I passed you the better one then

It's certainly possible.