[fpc-devel] FPC and Z80

[Marco van de Voort]

Op 2020-04-27 om 18:28 schreef Florian Klaempfl:
>
>> I have no idea, but quickly read through some docs, and it seems the
>> GameBoy CPU doesn't have IX/IY registers, which seems to be very 
>> useful to
>> implement some of the more complex references handling, according to 
>> what
>> Nikolay wrote earlier. 
>
> Yes. IX and IY are the key for the FPC Z80 port. Without them it's 
> getting really difficult. And I suspect we need to work without a 
> normal stack but allocate local variables globally, so basically no 
> recursion will be possible.
>
Well, for 6502 working 16-bit ptr indirect via volatile zp memory 
locations needs to be implemented anyway :-)

Does that CPU have no hardware stack at all, or only limited (128/256 
bytes or so?)