1mb chip ram with aca500plus on rev5 motherboard

Jens · Jan 14th 2020

Quote from amiganut

So, what the ACA is supposed to do? When setting in the menu PAL mode in theory you are forcing Agnus working in PAL mode.

Correct - that's what the option does. However, software that runs later than the menu may override the setting, as I explained before.

Quote from amiganut

Or do I have to isolate pin #41 anyway?

This will be the safe, but inconvenient option. YOu might want to explore the WHDload option first, as that does not involve removing the chip and possibly putting the computer in danger (no offense - I just don't know what level of experience you have).

amiganut · Jan 14th 2020

Hi, thanks again for the awser.

All the games accelerated are being launched using WHDload, therefore I have no explanation for the problem, but, anyway, because of 8371 runs in PAL mode and 8372A runs in NTSC by default I must assume the problem is here.

Therefore, I'll try to isolate pin #41 but I'm not going to touch the motherboard. First of all I'll try to isolate it with a tape. Do you know how can I identify pin #41?

thanks in advance

amiganut · Jan 14th 2020

Oh, I have a diagram of a 8370 Agnus chip. I think I know where it is. Let's see what happen...: /

amiganut · Jan 17th 2020

Hi Jens,

problem solved.

I have isolated pin #41 of the 8732A chip and now the problem has disappeared.

Thanks for your help.

PD: a thin PVC tape is enough for isolating the pin