Changes
/* Coordinates */
For a vram size of 512KB this gives image space heights of &1000,&800,&400,&200,&100 and &80.
* Confirmed with PSET and , BMLXand LMMC. When calculating the logical vram address of each line:
1) P1 mode is always 256 pixels wide, 4bpp (width (XIMM) and bpp (CLRM) settings with R6 are ignored). Therefore logical vram address of Y is defined as: (256/2)*y.
2) P2 mode is always 512 pixels wide, 4bpp (width (XIMM) and bpp (CLRM) settings with R6 are ignored). Therefore logical vram address of Y is defined as: (512/2)*y
