As a matter of advice, sack the 2Mb RAM cards and populate the Zeus and GVP boards with 30-pin SIMMs.
The Zeus have the ability to use 4Mb 30-pin RAM (to the maximum of 64Mb!). GVP SCSI controller will accept up to 8Mb RAM (8x 1Mb SIMMs).
The more cards you have inside, more power will be required by the system. Spare a Zorro slot for a graphics card (like the Spectrum) and reduce the Zorro-II RAM to 6Mbon the GVP SCSI to have a 1 + 70Mb RAM system (NOT BAD AT ALL!).
