Denial

Unfortunately the VIC chip cannot reach memory in the cartridge port, and the cartridge cannot reach memory or the VIC chip. Only the C64 had DMA capability to fill memory from a cartridge, so you could create a blitter that does the calculations to change the bytes in graphics memory for lines, fil...

If you want to support character set changes in RAM and screen memory together, you would be better off with a Graphic/Memory changes queue (like using part of the joint memory to queue up memory changes), so that you don't need to copy 4Kb repeatedly to keep the screen uptodate. Also, you may want ...