atari2600land's Blog

Figured it out. Apparently * in my disassembler (DASM) means org. It kept giving me an unknown mnemonic error if I put in * = 0801. I found this online and replaced the *=0801 with org $0801 and it runs good.

 

  org $0801
    .byte $0c, $08, $0a, $00, $9e, $20
    .byte $34, $30, $39, $36, $00, $00
    .byte $00

Here is a macro for you, suitable to be used in DASM. It is called like this:

 

basicline $0801,2018

 

where $0801 equals start of the program (org) and 2018 is the line number of the SYS. Basically it doesn't do anything your current code already doesn't, except that if you would have reason to use a different ORG or want a different line number, it will adjust automatically.

 

 

#mac basicline
  org {1}
  word 0$ ; link to next line
  word {2} ; line number
  byte $9E ; SYS token
 
; SYS digits
 
  if (* +  / 10000
    byte $30 + (* +  / 10000
  endif
  if (* + 7) / 1000
    byte $30 + (* + 7) % 10000 / 1000
  endif
  if (* + 6) / 100
    byte $30 + (* + 6) % 1000 / 100
  endif
  if (* + 5) / 10
    byte $30 + (* + 5) % 100 / 10
  endif
  byte $30 + (* + 4) % 10
  byte 0 ; end of BASIC line
0$:
  word 0 ; end of BASIC program
#endm