stas2k / galspanic Goto Github PK

Hello there,

thanks for this project , i wanted to check the pcb , but i'm unable to open it with KiCad for windows,
Tried the latest version stable 5.1.7 , nightly build and a older version from May 2020. Do you have a link to the version you're using ?

thanks in advance and best regards

On the schematic DTACK is Pin 1 on the GAL where as in the PLD file its is Pin 23. Since it is an output it can't be on Pin 1.

I noticed this after assembling a board with 3 SRAM chips and testing in an ACE with a Sharp 1 MB expansion on the internal memory expansion header. I worked around the issue by cutting the link on the "1 MB" jumper and adding a wire between the middle pad of the jumper and Pin 1 of the GAL. I tested with a program found somewhere called "mtest.r" which passed.

I also felt that the GAL was getting warm from driving DTACK as push-pull rather than open drain so I added an open drain buffer. It is maybe less warm, but I don't have a way to measure well. It worked with and without the buffer so this may not be an issue. I think using the tri-state outputs on the GAL should be able get the same effect.

If you can add a BOM to the release files I can make it without having to work out what version of kicad makes those file extensions.

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.