I managed to modify the VGA adapter of the Apple II+ on a FPGA to meet the requirements of my previous post.
It stills runs off the FPGA but, it uses the board's SRAM instead of internal block ram. The design fits well in a XC9572 CPLD, which is quite fine.


Colors are still a bit off, but text display works nice, showing that interleaved SRAM access works. Now I need to fix the colors (shouldn't be much of a big deal, as I already solved the issue on the SCART version), then use a CPLD, to be as close as possible of what would become a final version ;)