Isn't RDAT documented on page 216 of
the Programmers Reference from June 1984?
On another note, vector and hires modes show something - although parameters like direction (DIR) and X/Y (of lines and arcs) seem to be oddly 'reversed'.
I have to override 'm_bitmap_mod' in UPD7220.CPP, otherwise figures never appear. WDAT 0x22 (see above) frequently sets RMW mode to 2, which zaps all bits. Sure, i haven't fully grasped
how the extra hardware and the GDC interact..
Mastermind intro.
Circles are OK. Arc over text should appear rotated 180 degrees to right (adjacent to character w)...
![[Linked Image from dl.dropboxusercontent.com]](https://dl.dropboxusercontent.com/u/37819653/BANNISTER/2.jpg)
Graphics Demo.
Text barely readable (X axis...), lines have wrong direction
(Solitaire, hires, with vector mode)