Re: A82: A few Questions about 83--82 ASM
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Re: A82: A few Questions about 83--82 ASM
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>>Hey, I'm working on the 82 Port of Yoshi, and I need some help on
conversions
>>and stuff from the 83. Sam, or anyone else who also knows the 83 as
well
as
>>the 82, I could use some assistance... =)
>>
>>How do I display the contents of HL in small font...? I know I can't
>>use
>>this
>>83 code:
>> ld hl, (highscore)
>> call _setxxxxop2
>> call _op2toop1
>> call _dispop1a
>>but I came across a routine that was in Ahmed's Port Tutorial, which
>goes
>something like this:
>> push hl
>> ld de,string+5
>> xor a
>> ld (de),a
>>Repeat:
.> call UNPACK_HL
.> add a,'0'
>> dec de
>> ld (de),a
.> ld a,h
>> jr nz,Repeat
>> ex de,hl
>> ROM_CALL(D_ZM_STR)
>> pop hl
>> pop de
>>but I don't see how that will really work. Where does "string+5" come
>>in,
>>do I
>>have to define that, and what with?
>define string as something like TEXT_MEM -- give it 6 bytes i think.
Ok, quite simply something like this this:
ld hl,256*57+42
ld (pencol),hl
ld a,(keys)
call _setxxop1
ld a,2
call _dispop1a
Becomes this:
ld de,256*57+42
ld (CURSOR_X),de
ld a,(keys)
ld l,a
ld h,0
ld b,1
call DM_HL_DECI
DM_HL_DECI is the name of the routine you mentioned. Hope that helps.
>>What does UNPACK_HL do?
I think it divides HL by 10.
> Also, what is
>>"add a,'0' " suppose to achieve?
I think it means if a number is zero, it will display a zero.
>>Also, a few miscellaneous questions... What are the 82 equivalents of
>>"_vputmap",
>use M_CHARPUT
Yes, but be sure to use ROM_CALL(M_CHARPUT)
>> "_divHLbyA",
>.I think that's UNPACK_HL
no, UNPACK_HL divides HL by 10, _divHLbyA divides HL by A. The
correct equate is: "call $00A3"
>> "_HTimesL",
>use MUL_HL
Unfortunately, that is not defined in ti82.h or crash82.inc. Use:
"ROM_CALL($1F18-$1A)".
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