A500 - resurrection or pit of despair?

[JezC]

Ok, so the last A500 fails to boot at the moment (seems to be about 10 short flashes on the power LED, then one longer Flash & the cycle repeats - provided I've counted that correctly :lol: :roll: )

That looks to be upgradeable from 512k to 1M on the motherboard so I will have to decide what to do if/when I manage to fix it.

That won't be happening tonight though. :(

[exxos]

What is it with you and motherboard problems :lol: :chairsmack:

[rubber_jonnie]

Ok, so the last A500 fails to boot at the moment (seems to be about 10 short flashes on the power LED, then one longer Flash & the cycle repeats - provided I've counted that correctly :lol: :roll: )

That looks to be upgradeable from 512k to 1M on the motherboard so I will have to decide what to do if/when I manage to fix it.

That won't be happening tonight though. :(

Have you got the Amiga DiagROM? Might help

[atari030]

Ok, so the last A500 fails to boot at the moment (seems to be about 10 short flashes on the power LED, then one longer Flash & the cycle repeats - provided I've counted that correctly :lol: :roll: )

That looks to be upgradeable from 512k to 1M on the motherboard so I will have to decide what to do if/when I manage to fix it.

That won't be happening tonight though. :(

I just fixed a pair last week and one was doing that. I can't recall which was which (too many 500's lately), one was rev 5 and one was rev 6. The rev 5 had faulty U25 and the Rev 6 had an 8371 installed, swapped for a 8375 and away it went. Pretty sure it was the Rev 6.

[JezC]

What is it with you and motherboard problems :lol: :chairsmack:

I'm learning from the best (that's you @exxos :lol: :roll: ) plus a few other forum members...

[JezC]

Ok, so the last A500 fails to boot at the moment (seems to be about 10 short flashes on the power LED, then one longer Flash & the cycle repeats - provided I've counted that correctly :lol: :roll: )

That looks to be upgradeable from 512k to 1M on the motherboard so I will have to decide what to do if/when I manage to fix it.

That won't be happening tonight though. :(

Have you got the Amiga DiagROM? Might help

Not for the A500, just the ST version.
No suitable EPROMs for the A500 as far as I know, just 256k & 512k bit EPROMs...27c256. & 27c512

:(

[JezC]

Ok, so the last A500 fails to boot at the moment (seems to be about 10 short flashes on the power LED, then one longer Flash & the cycle repeats - provided I've counted that correctly :lol: :roll: )

That looks to be upgradeable from 512k to 1M on the motherboard so I will have to decide what to do if/when I manage to fix it.

That won't be happening tonight though. :(

I just fixed a pair last week and one was doing that. I can't recall which was which (too many 500's lately), one was rev 5 and one was rev 6. The rev 5 had faulty U25 and the Rev 6 had an 8371 installed, swapped for a 8375 and away it went. Pretty sure it was the Rev 6.

I'll check what that code indicates and look around those ICs as a starter - thanks!

[rubber_jonnie]

Have you got the Amiga DiagROM? Might help

Not for the A500, just the ST version.
No suitable EPROMs for the A500 as far as I know, just 256k & 512k bit EPROMs...27c256. & 27c512

:(

I use a BooBip 27C400 emulator, they are great and easily programmed. Not sure if they are still available.

[JezC]

They were out of stock when I last looked...

[rubber_jonnie]

They were out of stock when I last looked...

Ahh, rubbish...