ROM in RAM1..3 would render the cartridge inoperable in my VIC-20 though.tokra wrote:If you want the cart to sell in numbers however you could also use the 3K-area and even the 2K IO2/3-area, making the game +37K effectively. Only people with UltiMem or very special expansions would be able to soft-load such a game into their VIC-20
Pixel, before you start cramming data into somewhat obscure corners of the memory range, I'd suggest you just use a simple banking scheme for BLK1..3 controlled with registers in the I/O area ... if you need to go beyond +32K, that is.