ATM TURBO - RAM PAGING

[VELESOFT]

I need access on ATM TURBO 2+ from ZX basic to system port #xx77, but writing to this port is dibable. Why ?

I need switch ram pages in area #4000-#7FFF and #8000-#BFFF. But access to port #7FF7 and #BFF7 is ignored...

Please help. Ideal with example.

[Advertiser]