Manuel wrote:
>Actually it's 6 + 5 * (ZeroPage - 1), since a branch taken is 3 cycles.
Ugh, You'd think I'd know better than to post at 2am by now....
>Well, this certainly is fine - for any selfmodifying RAM kernels.
Um, sure, you could do that but for a RAM routine I'd think you should just skip the JMP altogether and just copy over only as many NOPs to RAM as you need to execute (Or, you could have a list of NOPs and just drop the RTS in at the correct place).
What I mean't was something like:
JMPaddress EQU $80
lda #10
jsr DoPause
... ;Code here
lda #20
jsr DoPause
... ;Code here
org $f200
DoPause:
clc
adc #$0d
sta JMPaddress
lda #$f2
adc #0 ;You can avoid this if max length won't exceed page boundary
sta JMPaddress+1
jmp (JMPaddress)
nop
nop
nop
nop
nop
nop
;Bunch more NOPs...
rts
Chris...
----------------------------------------------------------------------------------------------
Archives (includes files) at http://www.biglist.com/lists/stella/archives/
Unsub & more at http://www.biglist.com/lists/stella/
