Posted By
Luca
on 2010-12-19
10:49:51
 |  Re: Vertical splitting
I added this piece of code to my tech-tech, after the scanlines/badlines stuff and before the $ff13/$ff07 resetting, and I got a better stable performance:
I_2080 LDA $FF1E ; Horiz Scan
SEC
SBC #$96
LSR A ; div / 4
LSR A
STA V_208B + 1
V_208B BCC B_208D + 1
B_208D CMP #$C9
CMP #$C9
CMP #$C9
CMP #$C5
NOP
LDX #$05
B_2098 DEX
BPL B_2098
TLC can you explain this one deeply? It's very very interesting, have to say, especially the #$c9 slice where you can wait for either X cycles or X+2 cycles...
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