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text24.asm
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processor 6502
include "vcs.h"
include "macro.h"
SEG.U VARS
ORG $80
MACRO VSLEEP
bvs .j0
.j0
bvs .j1
.j1
ENDM
; $80
Temp ds 1
Frame ds 1
Text0 ds 1
Text1 ds 1
Text2 ds 1
Text3 ds 1
Text4 ds 1
Text5 ds 1
Text6 ds 1
Text7 ds 1
Text8 ds 1
Text9 ds 1
Text10 ds 1
Text11 ds 1
SEG CODE
ORG $F800
Start:
CLEAN_START
lda #6
sta NUSIZ0
sta NUSIZ1
lda #$0F
sta COLUP0
sta COLUP1
lda #1
sta VDELP0
sta VDELP1
NextFrame
VERTICAL_SYNC
lda #44
sta TIM64T
; My VBLANK code
inc Frame
TextSetPosition: SUBROUTINE
lda Frame
and #1
beq .position_frame_1
lda #32
ldx #0
jsr SetHorizPos
lda #48
ldx #1
jsr SetHorizPos
jmp .end_position
.position_frame_1
lda #40
ldx #0
jsr SetHorizPos
lda #56
ldx #1
jsr SetHorizPos
.end_position
sta WSYNC
sta HMOVE
WaitVBlank
lda INTIM
bne WaitVBlank ; loop until timer expires
sta WSYNC
sta VBLANK
TextKernel: SUBROUTINE
lda Frame
and #1
beq .loadtext1
ldx #11
.textloop0
lda Mesg2A,x
sta Text0,x
dex
bpl .textloop0
clv
bvc .drawtext
.loadtext1
ldx #11
.textloop1
lda Mesg2B,x
sta Text0,x
.SetVFlag
dex
bpl .textloop1
bit .SetVFlag
.drawtext
ldx Text0
lda left_text,x
ldx Text1
ora right_text,x
ldy #0
Frame0Text
; Text line 1 / 5
;line 1
sta WSYNC ; 3 (0)
sty COLUP0 ; 3 (3)
sty COLUP1 ; 3 (6)
sta GRP0 ; 3 (9)
ldx Text2 ; 4 (13)
lda left_text,x ; 4 (17)
ldx Text3 ; 4 (21)
ora right_text,x ; 4 (25*)
sleep 2
sta GRP1 ; 3 (28)
ldx Text4 ; 4 (32)
lda left_text,x ; 4 (36)
ldx Text5 ; 4 (40)
ora right_text,x ; 4 (44)
sleep 2
sta GRP0 ; 3 (47)
ldx Text6 ; 4 (51)
lda left_text,x ; 4 (55)
ldx Text7 ; 4 (59)
ora right_text,x ; 4 (63)
ldy #$0F ; 2 (65)
sty COLUP0 ; 3 (68)
sty COLUP1 ; 3 (71)
tay ; 2 (73)
;line 2
sta WSYNC ; 3 (0)
ldx Text8 ; 4 (4)
lda left_text,x ; 4 (8)
ldx Text9 ; 4 (12)
ora right_text,x ; 4 (16)
sta Temp ; 3 (19)
ldx Text10 ; 4 (23*)
lda left_text,x ; 4 (27)
ldx Text11 ; 4 (31)
ora right_text,x ; 4 (35)
ldx Temp ; 3 (38)
VSLEEP;sleep 4
sty GRP1 ; 3 (41)
stx GRP0 ; 3 (44)
sta GRP1 ; 3 (47)
sleep 3 ; 3 (50)
sta GRP0 ; 3 (53)
ldy #0 ; 2 (55)
ldx Text0 ; 3 (58)
lda left_text+1,x ; 4 (62)
ldx Text1 ; 3 (65)
ora right_text+1,x ; 4 (69)
; Text line 2 / 5
;line 1
sta WSYNC ; 3 (0)
sty COLUP0 ; 3 (3)
sty COLUP1 ; 3 (6)
sta GRP0 ; 3 (9)
ldx Text2 ; 4 (13)
lda left_text+1,x ; 4 (17)
ldx Text3 ; 4 (21)
ora right_text+1,x ; 4 (25*)
sleep 2
sta GRP1 ; 3 (28)
ldx Text4 ; 4 (32)
lda left_text+1,x ; 4 (36)
ldx Text5 ; 4 (40)
ora right_text+1,x ; 4 (44)
sleep 2
sta GRP0 ; 3 (47)
ldx Text6 ; 4 (51)
lda left_text+1,x ; 4 (55)
ldx Text7 ; 4 (59)
ora right_text+1,x ; 4 (63)
ldy #$0F ; 2 (65)
sty COLUP0 ; 3 (68)
sty COLUP1 ; 3 (71)
tay ; 2 (73)
;line 2
sta WSYNC ; 3 (0)
ldx Text8 ; 4 (4)
lda left_text+1,x ; 4 (8)
ldx Text9 ; 4 (12)
ora right_text+1,x ; 4 (16)
sta Temp ; 3 (19)
ldx Text10 ; 4 (23*)
lda left_text+1,x ; 4 (27)
ldx Text11 ; 4 (31)
ora right_text+1,x ; 4 (35)
ldx Temp ; 3 (38)
VSLEEP;sleep 4
sty GRP1 ; 3 (41)
stx GRP0 ; 3 (44)
sta GRP1 ; 3 (47)
sleep 3 ; 3 (50)
sta GRP0 ; 3 (53)
ldy #0 ; 2 (55)
ldx Text0 ; 3 (58)
lda left_text+2,x ; 4 (62)
ldx Text1 ; 3 (65)
ora right_text+2,x ; 4 (69)
; Text line 3 / 5
;line 1
sta WSYNC ; 3 (0)
sty COLUP0 ; 3 (3)
sty COLUP1 ; 3 (6)
sta GRP0 ; 3 (9)
ldx Text2 ; 4 (13)
lda left_text+2,x ; 4 (17)
ldx Text3 ; 4 (21)
ora right_text+2,x ; 4 (25*)
sleep 2
sta GRP1 ; 3 (28)
ldx Text4 ; 4 (32)
lda left_text+2,x ; 4 (36)
ldx Text5 ; 4 (40)
ora right_text+2,x ; 4 (44)
sleep 2
sta GRP0 ; 3 (47)
ldx Text6 ; 4 (51)
lda left_text+2,x ; 4 (55)
ldx Text7 ; 4 (59)
ora right_text+2,x ; 4 (63)
ldy #$0F ; 2 (65)
sty COLUP0 ; 3 (68)
sty COLUP1 ; 3 (71)
tay ; 2 (73)
;line 2
sta WSYNC ; 3 (0)
ldx Text8 ; 4 (4)
lda left_text+2,x ; 4 (8)
ldx Text9 ; 4 (12)
ora right_text+2,x ; 4 (16)
sta Temp ; 3 (19)
ldx Text10 ; 4 (23*)
lda left_text+2,x ; 4 (27)
ldx Text11 ; 4 (31)
ora right_text+2,x ; 4 (35)
ldx Temp ; 3 (38)
VSLEEP; sleep 4
sty GRP1 ; 3 (41)
stx GRP0 ; 3 (44)
sta GRP1 ; 3 (47)
sleep 3 ; 3 (50)
sta GRP0 ; 3 (53)
ldy #0 ; 2 (55)
ldx Text0 ; 3 (58)
lda left_text+3,x ; 4 (62)
ldx Text1 ; 3 (65)
ora right_text+3,x ; 4 (69)
; Text line 4 / 5
;line 1
sta WSYNC ; 3 (0)
sty COLUP0 ; 3 (3)
sty COLUP1 ; 3 (6)
sta GRP0 ; 3 (9)
ldx Text2 ; 4 (13)
lda left_text+3,x ; 4 (17)
ldx Text3 ; 4 (21)
ora right_text+3,x ; 4 (25*)
sleep 2
sta GRP1 ; 3 (28)
ldx Text4 ; 4 (32)
lda left_text+3,x ; 4 (36)
ldx Text5 ; 4 (40)
ora right_text+3,x ; 4 (44)
sleep 2
sta GRP0 ; 3 (47)
ldx Text6 ; 4 (51)
lda left_text+3,x ; 4 (55)
ldx Text7 ; 4 (59)
ora right_text+3,x ; 4 (63)
ldy #$0F ; 2 (65)
sty COLUP0 ; 3 (68)
sty COLUP1 ; 3 (71)
tay ; 2 (73)
;line 2
sta WSYNC ; 3 (0)
ldx Text8 ; 4 (4)
lda left_text+3,x ; 4 (8)
ldx Text9 ; 4 (12)
ora right_text+3,x ; 4 (16)
sta Temp ; 3 (19)
ldx Text10 ; 4 (23*)
lda left_text+3,x ; 4 (27)
ldx Text11 ; 4 (31)
ora right_text+3,x ; 4 (35)
ldx Temp ; 3 (38)
VSLEEP; sleep 4
sty GRP1 ; 3 (41)
stx GRP0 ; 3 (44)
sta GRP1 ; 3 (47)
sleep 3 ; 3 (50)
sta GRP0 ; 3 (53)
ldy #0 ; 2 (55)
ldx Text0 ; 3 (58)
lda left_text+4,x ; 4 (62)
ldx Text1 ; 3 (65)
ora right_text+4,x ; 4 (69)
; Text line 5 / 5
;line 1
sta WSYNC ; 3 (0)
sty COLUP0 ; 3 (3)
sty COLUP1 ; 3 (6)
sta GRP0 ; 3 (9)
ldx Text2 ; 4 (13)
lda left_text+4,x ; 4 (17)
ldx Text3 ; 4 (21)
ora right_text+4,x ; 4 (25*)
sleep 2
sta GRP1 ; 3 (28)
ldx Text4 ; 4 (32)
lda left_text+4,x ; 4 (36)
ldx Text5 ; 4 (40)
ora right_text+4,x ; 4 (44)
sleep 2
sta GRP0 ; 3 (47)
ldx Text6 ; 4 (51)
lda left_text+4,x ; 4 (55)
ldx Text7 ; 4 (59)
ora right_text+4,x ; 4 (63)
ldy #$0F ; 2 (65)
sty COLUP0 ; 3 (68)
sty COLUP1 ; 3 (71)
tay ; 2 (73)
;line 2
sta WSYNC ; 3 (0)
ldx Text8 ; 4 (4)
lda left_text+4,x ; 4 (8)
ldx Text9 ; 4 (12)
ora right_text+4,x ; 4 (16)
sta Temp ; 3 (19)
ldx Text10 ; 4 (23*)
lda left_text+4,x ; 4 (27)
ldx Text11 ; 4 (31)
ora right_text+4,x ; 4 (35)
ldx Temp ; 3 (38)
VSLEEP; sleep 4
sty GRP1 ; 3 (41)
stx GRP0 ; 3 (44)
sta GRP1 ; 3 (47)
sleep 3 ; 3 (50)
sta GRP0 ; 3 (53)
sta WSYNC
lda #0
sta GRP0
sta GRP1
sta GRP0
jmp ____end_text
; ========================================================================================================================== END
FinishVS
sleep 10
lda #0
sta GRP1
sta GRP0
sta GRP1
____end_text
ldx #(181)
VSLoop
sta WSYNC
dex
bne VSLoop
SetupOS
lda #36
sta TIM64T
; My Overscan code
WaitOverscan
lda INTIM
bne WaitOverscan
jmp NextFrame
SetHorizPos
sta WSYNC ; start a new line
bit 0 ; waste 3 cycles
sec ; set carry flag
DivideLoop
sbc #15 ; subtract 15
bcs DivideLoop ; branch until negative
eor #7 ; calculate fine offset
asl
asl
asl
asl
sta RESP0,x ; fix coarse position
sta HMP0,x ; set fine offset
rts ; return to caller
align 256
left_text
include "gen/text_left.asm"
right_text
include "gen/text_right.asm"
align 256
include "gen/mesg_data.asm"
ECHO ([$FFFC-.]d), "bytes free"
org $fffc
.word Start
.word Start