8-Bit Cart Framework

[Bill Lange]

I am trying to port my Atari Assembler Editor code to DASM. I was able to assemble and execute the 5200 Hello World program. I wasn't able to run it as an 400/800 cart after make some modifications to it using Mapping The Atari as a reference.

 

When I try to assemble my code with DASM, I get one error with the HLIST ... any suggestions?

 

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PROCESSOR 6502

 

SDMCTL equ $022F

SDLSTL equ $0230

SDLSTH equ $0231

 

COLOR0 equ $02C4; OS COLOR REGISTERS

COLOR1 equ $02C5

COLOR2 equ $02C6

COLOR3 equ $02C7

COLOR4 equ $02C8

 

ORG $A000 ;START OF CARTRIDGE AREA

SEI ;DISABLE INTERRUPTS

CLD ;CLEAR DECIMAL MODE

 

JMP DISPLAY

 

START

 

LINE1 .BYTE $00,$00,$00,$00,$00,$00

.BYTE $68,$61,$75,$6E,$74,$65,$64

.BYTE $00,$00,$00,$00

 

LINE2 .BYTE $00,$00,$00,$00,$00,$00,$00

.BYTE $68,$6F,$75,$73,$65

.BYTE $00,$00,$00,$00,$00

 

LINE3 .BYTE $00,$00,$00,$00,$00,$00

.BYTE $2E,$2F,$36,$29,$23,$25

.BYTE $00,$00,$00,$00,$00

 

LINE4 .BYTE $00,$00,$00,$00,$00,$00

.BYTE $27,$21,$2D,$25,$00,$19

.BYTE $00,$00,$00,$00,$00

 

LINE5 .BYTE $00,$00,$00

.BYTE $23,$2F,$30,$39,$32,$29,$27,$28,$34

.BYTE $00

.BYTE $12,$10,$10,$12

 

LINE6 .BYTE $00,$00,$00

.BYTE $00,$00,$00,$00

.BYTE $21,$34,$21,$32,$29

.BYTE $00,$00,$00,$00

.BYTE $00,$00,$00,$00

 

HLIST .BYTE $70,$70,$70

.BYTE $47

.WORD LINE1

.BYTE $47

.WORD LINE2

.BYTE $70,$70,$70

.BYTE $70,$70,$70

.BYTE $70,$70,$70

.BYTE $70,$70,$70

.BYTE $46

.WORD LINE3

.BYTE $70,$46

.WORD LINE4

.BYTE $70,$70,$70,$70,$46

.WORD LINE5

.BYTE $46

.WORD LINE6

.BYTE $70,$70,$70,$70,$70

.BYTE $41

.WORD HLIST

 

DISPLAY LDA #0

STA SDMCTL

LDA #HLIST&255

STA SDLSTL

LDA #HLIST/256

STA SDLSTH

LDA #$22

STA SDMCTL

 

INFI JMP INFI

 

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[Eckhard Stolberg]

HLIST is a 16-bit address, which you can't load into a 8-bit register. I think you are trying to generate the high-byte and the low-byte of this address here, right? DASM has special operators for this. The "greater-as" sign gets you the high-byte of a 16-bit values, and the "smaller-as" sign gets you the low-byte. (Sorry, but this message board doesn't allow you to post these characters, as it seems to interpret them as html code or something.)

 

 

Ciao, Eckhard Stolberg

[Bill Lange]

I seem to be having a little trouble with getting a ROM image to work in 400/800 mode, but have no trouble at all getting one to work in 5200 mode.

 

I think for now, I'll continue development as a 5200 cart image until I get it figured out.