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https://github.com/deater/dos33fsprogs.git
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138 lines
3.7 KiB
ArmAsm
138 lines
3.7 KiB
ArmAsm
; Blargh
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; by Vince `deater` Weaver
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.include "zp.inc"
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.include "hardware.inc"
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; 198 bytes -- proof of concept
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; 76 bytes -- optimize Apple II Forever printing code
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midline:
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;================================
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; Clear screen and setup graphics
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;================================
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sta FULLGR
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sta SETMOUSETEXT
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;====================================================
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; setup text page1 screen of "Apple II Forever" text
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;====================================================
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ldy #0
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restart:
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ldx #0
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iny
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beq print_done
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print_loop:
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lda a2_string,X
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beq restart
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jsr COUT ; output char in A to stdout
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inx
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bne print_loop
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print_done:
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;==================================
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; get exact vblank region
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;==================================
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; code by Sather
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; "Understanding the Apple IIe"
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poll1:
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lda VBLANK ; Find end of VBL
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bmi poll1 ; Fall through at VBL
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poll2:
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lda VBLANK
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bpl poll2 ; Fall through at VBL' ; 2
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lda $00 ; Now slew back in 17029 cycle loops ; 3
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lp17029:
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ldx #17 ; ; 2
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jsr waitx1k ; ; 17000
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jsr rts1 ; ; 12
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lda $00 ; nop3 ; 3
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lda $00 ; nop3 ; 3
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lda VBLANK ; Back to VBL yet? ; 4
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nop ; ; 2
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bmi lp17029 ; no, slew back ; 2/3
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;==============================
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; do the cycle counting
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;==============================
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blog:
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ldx #255
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blog_loop:
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jsr delay_16_setgr ; 16
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; 16
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jsr delay_16_settext ; 16
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; 32
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jsr delay_16_setgr ; 16
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; 48
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jsr delay_12 ; 12
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; 60
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dex ; 2
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jmp blog_loop ; 3
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delay_16_setgr:
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bit SET_GR
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delay_12:
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rts
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delay_16_settext:
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bit SET_TEXT
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rts
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;===================================
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; wait y-reg times 10
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;===================================
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loop10:
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bne skip
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waitx10:
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dey ; wait y-reg times 10 ; 2
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skip:
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dey ; 2
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nop ; 2
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bne loop10 ; 2/3
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rts ; 6
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;===================================
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; wait x-reg times 1000
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;===================================
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loop1k:
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pha ; 3
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pla ; 4
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nop ; 2
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nop ; 2
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waitx1k:
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ldy #98 ; wait x-reg times 1000 ; 2
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jsr waitx10 ; 980
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nop ; 2
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dex ; 2
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bne loop1k ; 2/3
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rts1:
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rts ; 6
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a2_string:
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; 012345678901234567 8 9
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; .byte "Apple II Forever!! ",'@'+$80," ",0
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.byte 'A'+$80,'p'+$80,'p'+$80,'l'+$80,'e'+$80,' '+$80
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.byte 'I'+$80,'I'+$80,' '+$80,'F'+$80,'o'+$80,'r'+$80
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.byte 'e'+$80,'v'+$80,'e'+$80,'r'+$80,'!'+$80,'!'+$80
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.byte ' '+$80,'@'+$00,' '+$80,0
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