Re: [cc65] Zero page, C stack, and interrupts

Hi,

> If you go for cooperative multitasking, things are easier, but you still need
> to save zero page locations used by a program and setting up separate stacks.

A not very clean but nevertheless functional cooperative multitasking
implementation for cc65 C programs:

http://contiki.cvs.sourceforge.net/viewvc/contiki/contiki-2.x/cpu/6502/sys/mtarch.h
http://contiki.cvs.sourceforge.net/viewvc/contiki/contiki-2.x/cpu/6502/sys/mtarch.c
http://contiki.cvs.sourceforge.net/viewvc/contiki/contiki-2.x/cpu/6502/sys/mtarch-asm.S

An example using it:

http://contiki.cvs.sourceforge.net/viewvc/contiki/contiki-2.x/examples/multi-threading/multi-threading.c

Regards,
Oliver
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