Posted By
George
on 2011-09-11
15:43:13
 |  Re: Draw a single pixel in assembler
Thanks a lot. i do not fully understand this here:
ORG $1001-2 <- this start address, but why -2?
DW $1001 <- whats this?
<-- what do you do here in this block?
DW nextln,0 ; second word is line number
DB $9E
IF start > 9999
DB "0"+start/10000
ENDIF
DB "0"+(start/1000)%10,"0"+(start/100)%10,"0"+(start/10)%10,"0"+start%10,0
nextln DB 0,0
ptr = $D0 <- you set a variable
start
SEI <- you stop interrupts here? Why?
STA $FF3F <- why this here?
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