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[BASIC] Replace ldy #0 + (zp),y addressing with (zp) addressing #350

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merged 6 commits into from
Aug 11, 2024
Merged

[BASIC] Replace ldy #0 + (zp),y addressing with (zp) addressing #350

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576dedb
[BASIC]: PEEK: Use lda (zp) instead of lda (zp),y with y=0
Fulgen301 Aug 10, 2024
073ca6b
[BASIC]: POKE: Use sta (zp) instead of sta (zp),y with y=0
Fulgen301 Aug 10, 2024
dd52cfd
[BASIC]: WAIT: Use lda (zp) instead of lda (zp),y with y=0
Fulgen301 Aug 10, 2024
78c6cf4
[BASIC]: VAL: Use (zp) addressing instead of (zp),y with y=0
Fulgen301 Aug 10, 2024
d984bc8
[BASIC] code17.s: Remove leftover ldy #0 instructions that aren't nee…
Fulgen301 Aug 10, 2024
725f8af
[BASIC] mlex10: Use adc (zp) instead of ldy #0 + adc (zp),y
Fulgen301 Aug 10, 2024
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25 changes: 10 additions & 15 deletions basic/code17.s
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Original file line number Diff line number Diff line change
Expand Up @@ -21,16 +21,14 @@ val_str bne @1
bcc val2
inx
val2 stx index2+1
ldy #0
lda (index2),y
lda (index2)
pha
tya ;a=0
sta (index2),y
lda #0
sta (index2)
jsr chrgot
jsr finh
pla
ldy #0
sta (index2),y
sta (index2)
st2txt ldx strng2
ldy strng2+1
stx txtptr
Expand All @@ -45,11 +43,10 @@ getadr0 jsr getadr
sta poker+1
rts
peek jsr getadr0
ldy #0
lda poker+1
cmp #$a0
bcs peek1
lda (poker),y ;Low RAM
lda (poker) ;Low RAM
jmp peek2
peek3 stz ram_bank
ldx crombank
Expand All @@ -59,7 +56,8 @@ peek3 stz ram_bank
peek1 cmp #$c0
bcs peek3
ldx crambank
peek4 lda #poker ;High RAM or ROM
peek4 ldy #0
lda #poker ;High RAM or ROM
jsr fetch
peek2 tay
dosgfl jmp sngflt
Expand All @@ -76,8 +74,7 @@ poke jsr frmadr
cmp #$a0
bcs pokefr
txa
ldy #0
sta (poker),y
sta (poker)
rts
pokefr2 stz ram_bank
txa
Expand All @@ -100,8 +97,7 @@ fnwait jsr getnum
beq stordo
jsr combyt
stordo stx eormsk
ldy #0
waiter lda (poker),y
waiter lda (poker)
eor eormsk
and andmsk
beq waiter
Expand Down Expand Up @@ -258,8 +254,7 @@ mlex10
adc tenexp ;like multiplying by five.
asl a ;and now by ten.
clc
ldy #0
adc (txtptr),y
adc (txtptr)
sec
sbc #'0'
mlexmi
Expand Down
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