@Crazyc: i am curious. How did you figure out the various bit masks (for "offset") in VRAM_W? Via schematics?

I am thinking of statements like
Code
WRITE16_MEMBER(vt240_state::vram_w)
{
...
	offset = ((offset & 0x30000) >> 1) | (offset & 0x7fff);

Last edited by Bavarese; 09/17/16 01:30 PM.