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Updating some of the demo asm files

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Safiire 2015-02-28 17:43:43 -08:00
parent 8f01494fbb
commit 602ff6754d
2 changed files with 13 additions and 13 deletions
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2
beep.asm
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@ -6,7 +6,7 @@
start: start:
LDA #$01 ; square 1 LDA #$01 ; square 1
STA $4015 STA $4015
LDA #$08 ; period low LDA #$F8 ; period low
STA $4002 STA $4002
LDA #$02 ; period high LDA #$02 ; period high
STA $4003 STA $4003

24
demo.asm
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@ -31,7 +31,7 @@ sprite:
main: main:
; Disable interrupts and decimal flag ; Disable interrupts and decimal flag
sei sei
cld cld
; Wait for 2 vblanks ; Wait for 2 vblanks
wait_vb1: wait_vb1:
@ -60,18 +60,18 @@ main:
ldx #$FF ldx #$FF
txs txs
; Disable all graphics. ; Disable all graphics.
lda #$00 lda #$00
sta $2000 sta $2000
sta $2001 sta $2001
jsr init_graphics jsr init_graphics
jsr init_input jsr init_input
jsr init_sound jsr init_sound
jsr init_ppu jsr init_ppu
; Resume interrupts and loop here forever ; Resume interrupts and loop here forever
cli cli
forever: forever:
jmp forever jmp forever
@ -112,8 +112,8 @@ init_sound:
sta $4015 sta $4015
lda #$00 lda #$00
sta $4001 sta $4001
lda #$40 lda #$40
sta $4017 sta $4017
rts rts
@ -237,7 +237,7 @@ react_to_input:
lda $4016 ; Is the A button down? lda $4016 ; Is the A button down?
AND #$01 AND #$01
beq not_a beq not_a
ldx $01 ; a ldx $01 ; a
bne a_done ; Only react if the A button wasn't down last time. bne a_done ; Only react if the A button wasn't down last time.
sta $01 ; Store the 1 in local variable 'a' so that we this is sta $01 ; Store the 1 in local variable 'a' so that we this is
@ -255,7 +255,7 @@ a_done:
ldx sprite ; Load Y value ldx sprite ; Load Y value
cpx #$07 cpx #$07
beq not_up ; No going past the top of the screen beq not_up ; No going past the top of the screen
dex dex
stx sprite stx sprite
not_up: not_up:
@ -271,7 +271,7 @@ not_dn:
rts ; Ignore left and right, we don't use 'em rts ; Ignore left and right, we don't use 'em
reverse_dx: reverse_dx:
lda #$FF lda #$FF
eor $00 ; dx eor $00 ; dx
clc clc
adc #$01 adc #$01
@ -291,7 +291,7 @@ scroll_screen:
lda #$00 lda #$00
sta $2005 ; Write 0 for Horiz. Scroll value sta $2005 ; Write 0 for Horiz. Scroll value
stx $2005 ; Write the value of 'scroll' for Vert. Scroll value stx $2005 ; Write the value of 'scroll' for Vert. Scroll value
no_scroll: no_scroll:
rts rts