mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-07-06 07:28:58 +00:00
158 lines
2.6 KiB
ArmAsm
158 lines
2.6 KiB
ArmAsm
; Display a 40x48d lo-res image
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; Uses the 40x48d page1/page2 every-1-scanline pageflip mode
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; by deater (Vince Weaver) <vince@deater.net>
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end_book:
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;===================
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; init screen
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jsr TEXT
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jsr HOME
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bit KEYRESET
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;===================
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; init vars
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lda #0
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sta DRAW_PAGE
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;===================
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; setup grahics
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jsr create_update_type1
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;=============================
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; Load graphic page0
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lda #<book_low
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sta GBASL
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lda #>book_low
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sta GBASH
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lda #$c ; load image to $c00
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jsr load_rle_gr
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lda #4
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sta DRAW_PAGE
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jsr gr_copy_to_current ; copy to page1
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; GR part
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bit PAGE1
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bit LORES ; 4
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bit SET_GR ; 4
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bit FULLGR ; 4
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;=============================
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; Load graphic page1
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lda #<book_high
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sta GBASL
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lda #>book_high
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sta GBASH
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lda #$c ; load image to $c00
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jsr load_rle_gr
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lda #0
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sta DRAW_PAGE
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jsr gr_copy_to_current
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; GR part
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bit PAGE0
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;==============================
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; setup graphics for vapor lock
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;==============================
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jsr vapor_lock
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; vapor lock returns with us at beginning of hsync in line
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; 114 (7410 cycles), so with 5070 lines to go
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; GR part
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bit LORES ; 4
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bit SET_GR ; 4
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bit FULLGR ; 4
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jsr gr_copy_to_current ; 6+ 9292
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; now we have 322 left
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; 322 - 12 = 310
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; - 3 for jmp
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; 307
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; Try X=9 Y=6 cycles=307
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ldy #6 ; 2
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loopQ: ldx #9 ; 2
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loopR: dex ; 2
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bne loopR ; 2nt/3
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dey ; 2
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bne loopQ ; 2nt/3
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jmp book_loop ; 3
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.align $100
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;================================================
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; Display Loop
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;================================================
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; We want to alternate between page1 and page2 every 65 cycles
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; vblank = 4550 cycles to do scrolling
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book_loop:
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jsr $9000 ; cycle-counted page0/page1 flip code
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;======================================================
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; We have 4550 cycles in the vblank, use them wisely
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;======================================================
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; do_nothing should be
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; 4550
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; -12 -- enter/leave flip code
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; -10 -- keypress code
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; =======
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; 4528 cycles
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;=================================
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; do nothing
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;=================================
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; and take 4528
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book_do_nothing:
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; Try X=4 Y=174 cycles=4525 R3
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lda TEMP ; 3
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ldy #174 ; 2
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bloop1:
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ldx #4 ; 2
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bloop2:
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dex ; 2
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bne bloop2 ; 2nt/3
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dey ; 2
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bne bloop1 ; 2nt/3
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lda KEYPRESS ; 4
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bpl book_no_keypress ; 3
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rts ; 6
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book_no_keypress:
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jmp book_loop ; 3
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