hkzlab

I'll have a look later at a way to do it without inserting programmable logic and/or adding too many IC.

[ISA_EMS.pdf](https://github.com/user-attachments/files/17818189/ISA_EMS.pdf) Here it is, added two more ICs. This should allow to set upper memory as disabled with a per-window configuration, so you can disable upper memory only for selected...

**Clearing** the bit enables all the RAM banks for said register. **Setting** it will disable the upper banks. So you should call it a 4MB Disable register :) Decoding takes...

You know, after looking at this with a fresh mind, and after having actually redrawn the schematic to add this feature... I still think it's a waste of space on...

Feel free to let me know if you find them (I would probably go PLD myself for this), I am not planning further changes to this board, though.