Strange "problem" A4000 ACIL

[Snoreb]

Hello everyone,

My A4000 Acil board has been running for 1 year and all tests with the test kit and various test programs and Diag Rom have been successfully passed.
Nevertheless behave the following:

Game Superfrog (only with this game can the behavior always be reproduced)
The game can be started regardless of whether it is from the disk or WHDLOAD and can also be played normally
But if I press any key (under WHD) and want to end the game with F10, I sometimes have to wait up to 1 minute.
I can even continue playing then suddenly it returns to wb
Sometimes I have to press the F10 key several times for this to happen

Boot from disc:
Here in the intro - trainer selection menu, as soon as I start with F1 or similar. If I select infinite lives I have to wait at least 30 seconds + for the next input.

This behavior also occurs from time to time in other games, but it is not always reproducible.
Various others Games such as e.g. PPHammer, Reshoot PRoxima,etc. run with code or something else input and , continue without any problems.

There must be a routine in some "area" at Superfrog where I have a quirk.

Just as strange is the fact that as soon as I change jumper J852 from 256k x 32 to 1Mb x 32, the system no longer boots

The question is what and which one.
If I start swapping the Ic's now I can build a new board straight away.

I strongly assume that the custom chips are all ok, what could possibly be a problem here is some kind of clock or something similar...

What I have already tried/swapped:
Both CIA (against new ones)
ADV7120 chip
U205
U216
C211C
Buster 9 to 11
All GALS with various timings 7,10 or 15 ns
Memory both chip and fast ram
2 different turbo cards A3660 and BFG
RTG cards in - out
Various software (WB versions and CF cards)
Early Setup Cache disabled (Whereby here comes (Guru Error: 0100 000F))


Since I'm not really happy with the system, I hope you can help me here.
At least maybe point me on the “right” track...

But the whole thing seems to take place in the Chip Ram area...
Or BUS error ..... or ... or

I hope someone can tell me what it could be. Maybe someone has had the same problem before

Kind regards
Christopher

 

[darefail]

It reminds me when I couldn't load from disk any game from sensible software (soccer and golf for sure).
Even though the trapdoor ram seemed ok, it was the problem. When I changed it with a new one the problem was solved.
I am not an expert but could it be a problem with the keyboard or something related to this on the m/b?

 

[qz3fwd]

Hello everyone,

My A4000 Acil board has been running for 1 year and all tests with the test kit and various test programs and Diag Rom have been successfully passed.
Nevertheless behave the following:

Game Superfrog (only with this game can the behavior always be reproduced)
The game can be started regardless of whether it is from the disk or WHDLOAD and can also be played normally
But if I press any key (under WHD) and want to end the game with F10, I sometimes have to wait up to 1 minute.
I can even continue playing then suddenly it returns to wb
Sometimes I have to press the F10 key several times for this to happen

Boot from disc:
Here in the intro - trainer selection menu, as soon as I start with F1 or similar. If I select infinite lives I have to wait at least 30 seconds + for the next input.

This behavior also occurs from time to time in other games, but it is not always reproducible.
Various others Games such as e.g. PPHammer, Reshoot PRoxima,etc. run with code or something else input and , continue without any problems.

There must be a routine in some "area" at Superfrog where I have a quirk.

Just as strange is the fact that as soon as I change jumper J852 from 256k x 32 to 1Mb x 32, the system no longer boots

The question is what and which one.
If I start swapping the Ic's now I can build a new board straight away.

I strongly assume that the custom chips are all ok, what could possibly be a problem here is some kind of clock or something similar...

What I have already tried/swapped:
Both CIA (against new ones)
ADV7120 chip
U205
U216
C211C
Buster 9 to 11
All GALS with various timings 7,10 or 15 ns
Memory both chip and fast ram
2 different turbo cards A3660 and BFG
RTG cards in - out
Various software (WB versions and CF cards)
Early Setup Cache disabled (Whereby here comes (Guru Error: 0100 000F))


Since I'm not really happy with the system, I hope you can help me here.
At least maybe point me on the “right” track...

But the whole thing seems to take place in the Chip Ram area...
Or BUS error ..... or ... or

I hope someone can tell me what it could be. Maybe someone has had the same problem before

Kind regards
Christopher

Maybe jump into the ACILL Discord where they might be able to help you?

 

[Boing-ball]

Looking at what you have swapped out and what you think the problem is (Chip RAM).You don’t mention if you have tried swapping the RAMSEY chip.

Also which Kickstart ROMs are you using. Believe it or not have had strange issues with Kickstart ROMs before now.

 

[droopy]

How and with wasthe motherboard built?
Cheap kina components should not be on an Amiga MB some caps resistors etc from china are not up to specs and can give problems in some situations..Atleast for a while some caps was pure fake and had smaller size caps "inside" them , changed/fake component numbers and such.

Most Amiga builders try to use ok components, but there are people on ebay building open hardware with the cheapest stuff they can find and the end users gets problems after a while and in some cases directly.

Not saying this is the problem with your MB but if it's history is unknown it could be an good idea to check the board.
Also cold soldering/bad joints can be a reason for strange faults.

Check all voltages on the chips and in test points to rule out any power issues.

A board could test fine 99 times and faulty 1 time if there are a bad soldering joint or voltage problem, badly seated chips (some remove the bottoms of the plcc sockets, making them not perfectly square and it might give problems like yours..