Re: use of variable in zeropage on a CBM 8032

Hi


thanks for your advices,

I'll try FAC/AFAC
it's for my monitor (works on replica 1/w65c816sxb (emulation mode) and 
mostly works on commodore 8032)
the idea is to have one moniteur for many machines

I have 4 pointers
PTR            =    $0054
SRC            =    $0002
DST            =    $00DD
AUXPTR     =    $0000

PTR  is a generic pointer to access memory    (in low level functions)
SRC/DST are used for transfers
AUXPTR is used while loading/saving in hex format

I'm planning to be able to build the monitor on the following machines:
- w65c816sxb
- replica 1 (Vince Briel)
- micro kim (Vince Briel)
- cbm 8032
- apple 2
- SYM  1
- Wichit 6502 trainer

- cbm 8096 (monitor in ext64)
- VIC 20
- C64
- PLUS 4
- CBM II
- w65c02sxb
- atari 800
- oric atmos

- any other 6502 machine if I get enough information on zero page and 
binary format

I'll put the code on github when I have reached a certain level of 
stability

On 15/11/2019 10:14, Anders Carlsson wrote:
> André Fachat wrote:
>
>> If you don't use floating points you could use the FAC and other float
>> registers (IIRC they are in zp, right?)
>
> Yes, some possible locations with PET addresses (which are different 
> from VIC/C64):
>
> INDEX1: $1F - $20 (utility pointers)
> INDEX2: $21 - $22
> TEMPF3: $4B - $4F (temporary FLPT storage)
> TEMPF1: $54 - $58
> TEMPF2: $59 - $5D
> FAC: $5E - $63
> AFAC: $66 - $6B
>
> As André wrote, it depends what the program does and which parts of 
> the ROM it uses. If it doesn't do anything with the FAC, there should 
> be plenty of space, in particular if you store the original ZP content 
> and restore it on exit.
>
> Best regards
>
> Anders Carlsson
>
>
>