10Mb Memory Expansion on X68000 Pro System

[rapiqui]

Hi,

I have made a couple of these expansions, as the project is very promising.
Unfortunately the first tests did not recognize the memory expansion.
The setup is as follows:

• Gals Panic! Expansion board fitted with 5*2Mb SRAM
• 1Mb RAM masking off
• 4,6,8 and 10 Mb switches on "ON" position
• Standard .pld equations (the one published, which I compiled)
• X68000 Pro with 2Mb internal Expansion

Once the X68000 boots, i execute switch.x and configure 10240 Kb, save the settings and reboot.
Once rebooted I get a message if I want to switch back to 2Mb.

I tried SSF2 and it does not even startup, so it seems that for some reason the memory expansion is not detected.

Am I missing anything?

Thank you.

[rapiqui]

Hi,

Just an update on this. I wrongly used 22V10CQZ-20XU GALs instead of the atf22v10c-10xu, which are faster.

I would suggest to include a BOM, as both memory modules and the GAL are very specific for this project.

Regards

[stas2k]

Hello, @rapiqui! I ran into the same issue it seems. Will keep this thread updated and BOM once I understand the issue a bit more. It should not matter that GAL is faster, if the pinout is the the same(which it seems it is).

[rapiqui]

Thank you. I have changed the issue title based on the fact that this might not be related to the GAL model.