James Pond II / II+ VIDC timings
Posted: Wed Apr 27, 2016 5:22 pm
Continuing the discussion around the VIDC emulation issues from the ADFFS 2.54 thread...
- Scrolling is jerky if the VSync IRQ is triggered before the screen geometry has been calculated (ArcEm also suffers this problem, Arculator and Red Squirrel do not)
- It's T1 timer values appear to be slightly out under VIDC emulation...which is possibly due to the timing issue from point 1 (ArcEm is spot on, Arculator and Red Squirrel are both way off on timings)