Subject: Re: [stella] An Efficient Waste Of Time From: Christopher Tumber <christophertumber@xxxxxxxxxx> Date: Fri, 18 Oct 2002 17:26:47 -0400 |
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/
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