2000 - black screen... Chips good... PSU good...

[Fingerlickin_B]

When fitting my MegAchip & reading the manual I saw interesting stuff about older/newer boards Agni, etc.

Maybe have a look at this for some ideas about board differences

http://amiga.resource.cx/exp/megachip#m_megachip

PZ.

[chiark]

Just bumping this again

I fitted a replacement known good agnus that my marvellous friend Zetr0 sent (is he around, not seen him for a while)

Same. Bloody. Thing.

Replaced the original agnus, and now the thing is not stuck in its reset loop: it gets to white (or possibly light grey), then flashes the power LED once and hangs.

I think there is some damage in the agnus socket - I hate changing those things, but that looks like the next thing.

Before I do... Is there a way of testing this TTL flip floppy thing before I waste hours on the sodding agnus socket?

[chiark]

I should mention that I've also changed every socketed chip (CIAs, Buster, 68000, Agnus, denise, gary, paula...) for known good ones with no effect whatsoever.

It's looking like a connection problem somewhere, or faulty logic chip.

[Paul_s]

Originally Posted by chiark

I should mention that I've also changed every socketed chip (CIAs, Buster, 68000, Agnus, denise, gary, paula...) for known good ones with no effect whatsoever.

It's looking like a connection problem somewhere, or faulty logic chip.

I think the first thing you should do is go round and knock the guys block off who butchered her!

The Agnus is a pain in the bum to get out as it is - so if they've buggered up the KS socket then god only knows what they've done elsewhere.

The shit would hit the fan if Dave Haynie knew about this .

[chiark]

It was bought as non-working, so I can't really complain.

I am wondering if it could be faulty RAM...

[rkauer]

Yes, can be one RAM chip at fault, but first try to replace the TTL 74LS32 next to the Agnus socket. Even better if you score a 74ALS32 instead. Even better: a 54ALS32 (MIL-SPEC TTL - no joke!).