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base: greg:06f267b2081daf431a3363c829431e2cf55ab894
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greg:master
greg:tutorial
greg:modernize
..
compare: greg:f1d3f2f6b64f34528f5e158e795c8fb83d7a7c40
Branches Tags
greg:master
greg:tutorial
greg:modernize

6 Commits
06f267b208 ... f1d3f2f6b6

Author SHA1 Message Date
Greg Shuflin
f1d3f2f6b6 Read from joypad 2022-06-15 11:30:27 -07:00
Greg Shuflin
8f947ae232 Draw another tile 2022-06-15 11:14:37 -07:00
Greg Shuflin
0de9c89162 Go back to tile 0 2022-06-15 11:10:07 -07:00
Greg Shuflin
33bd61d62a Use tile 1 for entire background 2022-06-15 11:08:30 -07:00
Greg Shuflin
26d66e9b8d Change sprite layout 2022-06-15 11:06:58 -07:00
Greg Shuflin
db5a2c1b32 Fix color descriptions 2022-06-15 11:06:47 -07:00
2 changed files with 46 additions and 8 deletions
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25
homebrew-tutorial/charset.asm
View File

@ -18,8 +18,8 @@ charset:
.byte %00000000 .byte %00000000
; tile 0x01 ; tile 0x01
.byte %11111111 ; row 0, color 0 .byte %11110000 ; row 0, color 0
.byte %00000000 ; row 0, color 1 .byte %11111111 ; row 0, color 1
.byte %10000001 ; row 1, color 0 .byte %10000001 ; row 1, color 0
.byte %00000000 ; row 1, color 1 .byte %00000000 ; row 1, color 1
.byte %10000001 ; row 2, color 0 .byte %10000001 ; row 2, color 0
@ -35,4 +35,25 @@ charset:
.byte %11111111 ; row 7, color 0 .byte %11111111 ; row 7, color 0
.byte %00000000 ; row 7, color 1 .byte %00000000 ; row 7, color 1
; tile 0x02
.byte %00000000
.byte %11111111
.byte %00000000
.byte %11111111
.byte %00000000
.byte %11111111
.byte %00000000
.byte %11111111
.byte %00000000
.byte %11111111
.byte %00000000
.byte %11111111
.byte %00000000
.byte %11111111
.byte %00000000
.byte %11111111
charset_end: charset_end:

29
homebrew-tutorial/main.asm
View File

@ -29,13 +29,13 @@ start:
lda #$00 lda #$00
sta CGDATA sta CGDATA
; Color 2 - blue ; Color 2 - green
lda #$e0 lda #$e0
sta CGDATA sta CGDATA
lda #$03 lda #$03
sta CGDATA sta CGDATA
; Color 3 - green ; Color 3 - blue
lda #$00 lda #$00
sta CGDATA sta CGDATA
lda #$7c lda #$7c
@ -69,7 +69,8 @@ start:
ldx #(VRAM_BG1) ldx #(VRAM_BG1)
@loop: @loop:
stx VMADDL stx VMADDL
stz VMDATAL lda #$00
sta VMDATAL
stz VMDATAH stz VMDATAH
inx inx
cpx #(VRAM_BG1 + 32 * 29) cpx #(VRAM_BG1 + 32 * 29)
@ -88,12 +89,28 @@ start:
lda #%00000001 lda #%00000001
sta TM sta TM
lda #$0f lda #$0f
sta INIDISP sta INIDISP
lda #$01
sta NMITIMEN
mainloop:
lda JOY1H
bit #%00000100 ; Down button
beq down_not_pressed
; write tile 2 to position (4, 8)
TILE_X2= 4
TILE_Y2= 8
ldx #(VRAM_BG1 + (TILE_Y2* 32) + TILE_X2)
stx VMADDL
lda #$02
sta VMDATAL
stz VMDATAH
down_not_pressed:
bra mainloop
busywait: busywait:
bra busywait bra busywait