I'm currently experimenting some dirty tricks in order to save space. If
the 9-byte VSYNC is giving trouble, you might be able to use this. Under
certain conditions (stack pointer = $FF, that is) you can do VSYNC in 8
bytes, provided you combine it with the overscan timer.
.1
LDX INTIM ; overscan timer
BNE .1
; x=0, Z flag = 0 here
; If stack pointer isn't initially $FF, this won't work!
TXS ; set stack pointer on top of VSYNC register ($00)
PHP ; pushes Z=1 (bit 1 set) to VSYNC then resets SP to $FF.
INC WSYNC ; INC does two writes to WSYNC, giving you two scanlines!
STA WSYNC
STX VSYNC ; x=0, ends VSYNC
I haven't actually tried this on real hardware, so use at your own risk!
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