A4000 RAM problem

[toRus]

I have an A4000 - revision 2B - that I can't make to recognise any fast RAM, either on the motherboard (4 x 4MB RAM or 1 x 4MB RAM SIMM module using an A3640 card) or/and on a CyberStorm MK2 card (2 x 16 SIMMs).

Has anyone faced a similar issue ? Is it likely a motherboard problem or do I have to try other SIMMs ?

[toRus]

Thanks,
I 've got a rev11 Buster and a rev7 Ramsey chip. Do you think it is Ramsey ? Is it responsible for all fast RAM access or just for the onboard memory ?

The problem is that Ramsey is surface mounted so I guess I have a dead Amiga ( I can't afford sending abroad for repair.

[toRus]

There is only one jumper and AFAIK it has nothing to do with RAM :-/

[toRus]

I should state that I have to use internal source (jumpers J100 and J104) for the CyberStorm while use external for the A3640,

My only hope is that the SIMMs are faulty. It's hard to find single sided 4MB modules these days. I will try bigger sizes with the CyberStorm over the weekend.

[toRus]

tonyw wrote:
Did you try swapping the SIMMs into the Chip RAM slot to test them?

I 've just tried all four 4MB and one 16MB single sided in the Chip memory slot. They were recognised but gave me only 1MB of chip mem.