On Fri, 02 May 2008 19:23:54 +0100, Arnaud Delobelle wrote:
> Marc 'BlackJack' Rintsch <[EMAIL PROTECTED]> writes:
>
>>
>> There are no modern processors with an opcode for incrementing a memory
>> location!? At least my C64 can do that. ;-)
>
> Indeed! I remember a simple use was to make the border change colour
> very fast, a v. cool effect when you're 12!
>
> CLV
> LOOP: INC $D020
> BVC LOOP
>
> (from memory, untested!)
That works but I think
LOOP: INC $D020
JMP LOOP
is a bit more straight forward. Shorter in opcodes, equal in bytes, the
loop is as fast but you save the two cycles of the CLV. :-)
Ciao,
Marc 'BlackJack' Rintsch
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