Subject: Re: [stella] Odd Occurance in Program From: "Chris Larkin" <clarkin@xxxxxxxxxxxxx> Date: Thu, 9 Jan 2003 09:36:56 -0800 |
(Shrug).... OK :-)... The PlusFive table has been modfied for testing, and does only contains two symbols... Attached are two shots... one of the kernel crashing... and one of the kernel functioning fine with the X value less than 50. The timing is off so the symbols don't line up correctly... but that is not my concern at the moment. PlusFive .byte $00,$00,$00,$0E,$42,$42,$EE,$48,$48,$0E,$00,$00 .byte $00,$00,$00,$0B,$4B,$4A,$EA,$4A,$4B,$0B,$00,$00 .byte $00,$00,$00,$0B,$4B,$4A,$EA,$4A,$4B,$0B,$00,$00 .byte $00,$00,$00,$0E,$42,$42,$EE,$48,$48,$0E,$00,$00 .byte $00,$00,$00,$0E,$42,$42,$EE,$48,$48,$0E,$00,$00 .byte $00,$00,$00,$0B,$4B,$4A,$EA,$4A,$4B,$0B,$00,$00 .byte $00,$00,$00,$0E,$42,$42,$EE,$48,$48,$0E,$00,$00 .byte $00,$00,$00,$0B,$4B,$4A,$EA,$4A,$4B,$0B,$00,$00 .byte $00,$00,$00,$0B,$4B,$4A,$EA,$4A,$4B,$0B,$00,$00 ;*************************************************************************** **************** ;Draw card boxes DrawDr LDX #7 ;Draw 7 cards on screen STX $81 LDA #$34 STA COLUP0 ;Set color for card symbols to red CardLoop LDX #11 ;Each card "box" gets 11 scan lines STX $84 ;Store 11 into $84 we will decrement this for loop count. LDA #$0F STA COLUPF ;Box is white TXA ;Load 11 into accumulator CLC ;Clear carry bit ADC $85 ;Add the current card offset to the accumulator TAX ;Move accumulator back to X register LDX #59 ;Used for debugging when X equates to this high, the kernel crashes. If below 50 the kernel functions fine. InCardLoop ;Loop 11 times, drawing card symbol and white box. STA WSYNC LDA PlusFive,X STA GRP0 LDA #%11100000 STA PF2 LDA $82 ;$82 is enabled if the symbol sprite requires an extra pixel of data from the missle graphics. I have disabled this for testing. BEQ Nope LDA PlusFive,X STA ENAM0 JMP Laa Nope ;Delay to make all the symbols line up correctly nop nop nop nop Laa nop nop nop nop LDA #%00110000 STA PF0 STA RESP0 ;Position Player graphic near middle of screen STA RESM0 LDA #0 STA PF2 STA PF0 STA ENAM0 DEY ;Y contains scan lines remaining on screen. DEX ;X contains card offset index DEC $84 ;$84 contains how many scan lines remaining for this card BNE InCardLoop STA WSYNC LDX #0 STX $82 ;Reset missile pixel STX GRP0 LDX $81 ;$81 contains how many cards are left to draw on screen DEX ;Decrement it LDA PlayerHand,X ;Load the players next card's offset index. STA $85 STA WSYNC DEY ;Decrement Y twice because we used two scan lines here. DEY DEC $81 ;Now decremement the current card count in memory. BNE CardLoop ;************************************************************
Attachment:
KABLAM2.JPG
Description: JPEG image
Attachment:
KABLAM.JPG
Description: JPEG image
Current Thread |
---|
|
<- Previous | Index | Next -> |
---|---|---|
Re: [stella] Odd Occurance in Progr, Manuel Polik | Thread | Re: [stella] Odd Occurance in Progr, Thomas Jentzsch |
Re: [stella] Cartridge dumper, Paul Slocum | Date | Re: [stella] Cartridge dumper, Adam Thornton |
Month |