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Forums > C64 Coding > ca65 and zero page initialised data
2019-12-31 09:57

Registered: Aug 2004
Posts: 1084
ca65 and zero page initialised data

Has anyone managed to convince ca65 to assemble code to zero page, with it actually treating zero page addresses appropriately?

If I mark a segment as being of type "zp" it then assumes it's uninitialized.

My current hack is to assemble it with a destination of $0900 (which is where I'll be copying it from anyway), and just use


anywhere I want to define a label, but of course I'll have to not do that for any branch destinations. It's not ideal..
2019-12-31 10:56

Registered: Apr 2002
Posts: 1538
Have you tried .org $xy? =)

That said, assuming you're working on a small project (4K ICC intro) that doesn't really need all that segment/linking stuff, i recommend using 64tass instead of ca65.
2019-12-31 11:27

Registered: Apr 2002
Posts: 4611

.logical <expression>
Changes the program counter only, the compile offset is not changed. When finished all continues where it was left off before.
2019-12-31 12:01

Registered: Aug 2004
Posts: 1084
Ooh, I've not tried setting .org directly yet - it doesn't always work that well with this assembler, but might be worth a try in this instance.

Probably a little late in the day to try switching assemblers (yes, it's for an ICC entry), and besides, I'm fairly reliant on interleaving source for different .prgs at the moment, and being able to casually refer to lables from different areas.
2020-01-11 16:53

Registered: Jun 2002
Posts: 1725
Did you try mark the segment with ZP-adressing? I.e. not type=ZP but in the code you write:

.segment "ZP": zeropage
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