butjer1010 wrote on 2025-07-06, 14:12:

Probably the 1MB is recognized is because i have only 3chips 1MB modules, and the original modules (both are faulty) were 5 chip modules. Need to buy the same, and i guess it will recognize 2MB 😀
Mouse problem solved, 25 to 9 pin adapter in connector above the keyboard connector, and it works!
When i buy memory modules, i will try to install sound card!

Do you have the M290 tech manual (is diff than the 290-25 and 290-30) ? With 2 x 1MB simms you need to change the P1 jumper and the dip switches 1 & 2.
The manual does list the Miniscribe 3425 HD to be set as type 16 as in your picture...

Horun wrote on 2025-07-06, 15:21:

butjer1010 wrote on 2025-07-06, 14:12:

Probably the 1MB is recognized is because i have only 3chips 1MB modules, and the original modules (both are faulty) were 5 chip modules. Need to buy the same, and i guess it will recognize 2MB 😀
Mouse problem solved, 25 to 9 pin adapter in connector above the keyboard connector, and it works!
When i buy memory modules, i will try to install sound card!

Do you have the M290 tech manual (is diff than the 290-25 and 290-30) ? With 2 x 1MB simms you need to change the P1 jumper and the dip switches 1 & 2.
The manual does list the Miniscribe 3425 HD to be set as type 16 as in your picture...

Thanks a lot, P1 jumper was on 1-2 instead of 2-3 position, now i have available memory 😀
Unfortunately, Miniscribe disk is faulty. I tried to set it on 16, and tried with DOS disk, but FDISK gives me errors about "no hard disk" 🙁
Now it is the time for Sound Card 😀

Managed to add CT2940 with unisound driver, now everything works perfect!!!
Thanks to everybody here, now i have fully working Olivetti M290!!!!