328 lines
3.8 KiB
ArmAsm
328 lines
3.8 KiB
ArmAsm
; Closing Text Spin Demo
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.include "zp.inc"
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;===========
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; CONSTANTS
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;===========
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NUM_CREDITS EQU 10
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;================================
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; Clear screen and setup graphics
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;================================
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jsr clear_screens ; clear top/bottom of page 0/1
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jsr set_gr_page0
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;===============
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; Init Variables
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;===============
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lda #0 ; 2
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sta DRAW_PAGE ; 3
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;===============
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; Init screen
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;===============
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jsr init_screen
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jsr page_flip ; 6
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jsr init_screen
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;===========================
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;===========================
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; Main Loop
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;===========================
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;===========================
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forever_loop:
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ldx #0
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stx YY
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lda #>credits
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sta OUTH
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lda #<credits
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sta OUTL
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outer_loop:
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credit_loop:
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ldy #0
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lda (OUTL),Y ; load x offset
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clc ; and add 7 to it
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adc #7
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sta CH
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lda #22 ; y hardcoded at 22
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sta CV
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lda #$f6 ; - 10
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sta XX
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inner_loop:
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jsr htab_vtab
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ldy #1 ; loop through the string
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print_loop:
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lda (OUTL),Y
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beq done_print
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clc
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adc XX ; add -10
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ora #$80 ; convert from ASCII
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sta (BASL),Y ; write to display
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iny ; point to next
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jmp print_loop
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done_print:
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;==================
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; flip pages
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;==================
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jsr page_flip ; 6
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;==================
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; delay?
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;==================
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lda #$C0
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bit SPEAKER
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jsr WAIT
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ldx XX
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inx
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stx XX
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cpx #1
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bne inner_loop
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;==================
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; Delay since done
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;==================
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lda #$F0
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jsr WAIT
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lda #$F0
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jsr WAIT
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lda #$F0
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jsr WAIT
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lda #$F0
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jsr WAIT
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;==================
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; Next credit
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;==================
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lda #8
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sta CH
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lda #22
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sta CV
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lda OUTH
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pha
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lda OUTL
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pha
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lda #>empty
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sta OUTH
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lda #<empty
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sta OUTL
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jsr print_both_pages
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pla
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sta OUTL
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pla
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sta OUTH
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ldy #0
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skip_credit:
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lda (OUTL),Y
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inc OUTL
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bne overflow
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inc OUTH
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overflow:
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cmp #0
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beq done_skip
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jmp skip_credit
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done_skip:
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ldx YY
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inx
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stx YY
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cpx #10
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beq forever
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jmp outer_loop
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;==================
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; loop forever
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;==================
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forever:
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jmp forever_loop ; 3
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;=====================
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; init screen
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;=====================
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init_screen:
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lda #$ff
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sta COLOR
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; HLIN Y, V2 AT A
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ldy #7
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lda #32
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sta V2
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lda #38
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jsr hlin_double
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lda #$75
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sta COLOR
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; hlin_double(PAGE0,0,6,38);
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ldy #0
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lda #6
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sta V2
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lda #38
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jsr hlin_double
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; hlin_double(PAGE0,33,40,38);
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ldy #33
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lda #40
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sta V2
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lda #38
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jsr hlin_double
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; hlin_double(PAGE0,8,31,36);
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ldy #8
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lda #31
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sta V2
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lda #36
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jsr hlin_double
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lda #$70
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sta COLOR
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; hlin_double(PAGE0,7,7,36);
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ldy #7
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lda #7
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sta V2
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lda #36
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jsr hlin_double
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; hlin_double(PAGE0,32,32,36);
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ldy #32
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lda #32
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sta V2
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lda #36
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jsr hlin_double
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; text wings
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lda #$20
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sta COLOR
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; hlin_double(0,7,40)
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ldy #0
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lda #7
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sta V2
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lda #40
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jsr hlin_double
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; hlin_double(32,40,40)
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ldy #32
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lda #40
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sta V2
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lda #40
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jsr hlin_double
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; hlin_double(0,7,44)
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ldy #0
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lda #7
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sta V2
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lda #44
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jsr hlin_double
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; hlin_double(0,7,44)
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ldy #32
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lda #40
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sta V2
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lda #44
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jsr hlin_double
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; hlin_double(7,33,48)
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ldy #7
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lda #32
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sta V2
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lda #46
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jsr hlin_double
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lda #11
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sta CH
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lda #20
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sta CV
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lda #>thankz
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sta OUTH
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lda #<thankz
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sta OUTL
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jsr move_and_print
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rts
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empty:
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.asciiz " "
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; offset can't be 0 or it confuses the next-credit code
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credits:
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.byte 7
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.asciiz "FROGGYSUE"
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.byte 7
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.asciiz "PIANOMAN08"
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.byte 7
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.asciiz "UTOPIA BBS"
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.byte 5
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.asciiz "THE 7HORSEMEN"
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.byte 2
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.asciiz "WEAVE'S WORLD TALKER"
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.byte 6
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.asciiz "STEALTHSUSIE"
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.byte 3
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.asciiz "ECE GRAD BOWLING"
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.byte 6
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.asciiz "CORNELL GCF"
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.byte 1
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.asciiz "ALL MSTIES EVERYWHERE"
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.byte 10
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.asciiz "..."
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thankz:
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.asciiz "SPECIAL THANKS TO:"
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;===============================================
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; External modules
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;===============================================
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.include "pageflip.s"
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.include "gr_setpage.s"
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;.include "keypress.s"
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.include "gr_offsets.s"
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.include "gr_fast_clear.s"
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.include "gr_hlin.s"
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.include "text_print.s"
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