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'. crazy

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] [Linked Image from]

[Linked Image from] [Linked Image from] Graphics Demo. Text barely readable (X axis...), lines have wrong direction

[Linked Image from]
(Solitaire, hires, with vector mode)

Last edited by Bavarese; 10/18/16 05:22 PM.