Mark De Smet wrote:
> I am most puzzled by the sears video arcade 2 not working, because I
> thought the sears models were produced by atari and just rebranded.
>
> Thomas, do you know what could happen to cause the above problems? Can it
> be linked to an illegal opcode?
No, there aren't any illegal opcodes in my kernel (just very close timings) or the thrust routine.
Here is the thrusting code:
lda INPT0 ; 3 booster grip trigger
ora INPT1 ; 3 booster grip booster
bmi .doThrust ; 2³
lda ShipPosYlo ; 3 shield activated?
and #[SHIELD_ON] ; 2
beq .noShield ; 2³ no, skip
lda INPT4 ; 3 fire button pressed?
bpl .doThrust ; 2³ yes, thrust
bmi .noThrust ; 2³ no, skip
.noShield:
lda SWCHA ; 4
and #JOYUPMASK ; 2
bne .noThrust ; 2³
.doThrust:
I guess the 2800 problem has something to do with the booster grip code.
Maybe someone will write an emulator which simulates all incompatiblities, then i could try to change my code a little bit. :-)
Thomas Jentzsch | *** Every bit is sacred ! ***
tjentzsch at web dot de |
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