Manuel Polik wrote:
> In Starmaster I found this loop:
>
> LDX #$18
> Loop: STA WSYNC
> LDA VSYNC
> NOP
> NOP
> NOP
> NOP
> DEX
> BPL Loop
[snip]
> Now, I've no clue, what the LDA VSYNC & the NOPs are for...
> Can someone explain that to me?
LDA VSYNC is a problem of DiStella, it doesn't show read accesses correct (should be LDA CXM0P). Try the trace-mode of z26, there you will find the right code and some more valuable information.
The NOPs are used for the following routine, where some player positioning happens (I think, they could have moved those NOPs behind the loop).
Thomas Jentzsch | *** Every bit is sacred ! ***
tjentzsch at web dot de |
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