TELEVISION PROTOCOL
- TV picture: 60fps, each frame drawn line by line
- 1 frame (Atari's research data for max TV compat)
- 262/312 lines, 228 clocks per line
- 3 x VSYNC + 37/45 x VBLANK + 192/228 display + 30/36 overscan
- VSYNC = signal TV to start new frame
- VBLANK = ?
- overscan = ?
- 1 line = 68 cycle horizontal blank + 160 cycle display
- horizontal timing handled by TIA
- WSYNC stops CPU till start of next line
- vertical timing by CPU
- after completion of a frame => VSYNC + VBLANK + pic + VBLANK
- 1 CPU cycle = 3 TIA cycle
- TV pic
- drawn line at a time
- CPU put data for line into TIA, TIA convert data to video signals
- TIA has data only for current line
- 70/85 blank lines for game logic