Hmm didnt solve the problem. Still no RAM detected. Tried 2 different 🙁

Did you try using some contact cleaner on the Lock / Normal switch ? Also maybe re-clean the ISA contacts ...

Yes, already cleaned the ISA-connector with a rubber. Will test the switch with my multimeter...

You are using 9 chip 70nS simms so it should see them. Maybe something in the motherboard BIOS is causing it ? I have a 286 that I have to enter the total ram window or it will not see a 2Mb add-on ram card. just a thought...

I am currently using a 286 with 1 MB onboard and MR-BIOS, see here
How about a MR-BIOS ROM file repository?
There is nothing to be entered about RAM. The card-RAM should be autodetected.

Before that I tried the card in a 486 with 4 MB, same result.

Do you also own the Rampat?

Predator99 wrote on 2020-03-08, 21:43:

I am currently using a 286 with 1 MB onboard and MR-BIOS, see here How about a MR-BIOS ROM file repository? There is nothing to […]
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I am currently using a 286 with 1 MB onboard and MR-BIOS, see here
How about a MR-BIOS ROM file repository?
There is nothing to be entered about RAM. The card-RAM should be autodetected.

Before that I tried the card in a 486 with 4 MB, same result.

Do you also own the Rampat?

No not a Rampat, mine is an old IBM AT 16bit XMA/EMS memory card. The Rampat docs say you must use 9 chip 80nS or faster simms. And for two simms use top two sockets.
A picture shows the driver screen and "Next Starting Address". Is the driver configurable ? Maybe it needs a specific config.sys line ? I am stumped.

The driver comes as a boot disk. It loads really quick without a config.sys or autoexec.bat. There is no option and no kind of interaction. It just shows the screen (screenshot on the top of the thread) and asks to reboot.

You can also load the config program from DOS. But there are no command line options, too. I have read somewhere that one should use the bootdisk.

Have you tried a different set of 1Mb parity SIMMS ?