GVP RAM32 board with A2000-030

[marmotta]

@thebajaguy Very good explanation! Sorry for resuming this very old thread but is of my interest… I have A3001, my question is: the pal on ram32 is really different from 33 and 50mhz version or are identical and change only the jumpers setup? My problem is the ram32 work good at 33 (and 40) mhz but no way to go it at 50mhz and map high the memory :-( 

The cpu card work good at 50mhz, ram32 not… (tried some jumpers configuration, some simm’s ecc…)

[marmotta]

Ok! But the question is: my ram32 board is damaged or it born to run at 33mhz and can’t go at 50mhz?

Sorry for my poor English :-)

[marmotta]

@thebajaguy

Can be the rom?

At 50mhz the 1mb simm always do a defective on boot diagnostics, probably the a3001 at 50mhz not support 1mb simm, and can’t map memory on zorro2 space. With 4mb simm mapped high, the memory board (and the memory) is not visible, I can assume the card is not mapped on zorro2 space and based on your explanation the rom enable the ram and map it high… but this not happens! My Rom is 3.3 and insert it, or removing, nothing change.

The two roms u24 u25 are needed only for unix? In my board are missing.