2018-07-18 13:27:26 +00:00
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; Kansasfest HackFest Entry
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2018-07-19 00:01:06 +00:00
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; Zero Page
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DRAW_PAGE = $EE
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2018-07-18 21:13:33 +00:00
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; Soft Switches
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SET_GR = $C050 ; Enable graphics
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FULLGR = $C052 ; Full screen, no text
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LORES = $C056 ; Enable LORES graphics
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; ROM routines
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2018-07-18 13:40:37 +00:00
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TEXT = $FB36 ;; Set text mode
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HOME = $FC58 ;; Clear the text screen
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2018-07-18 13:27:26 +00:00
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2018-07-18 21:13:33 +00:00
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2018-07-18 13:27:26 +00:00
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;===================
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; init screen
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2018-07-18 13:40:37 +00:00
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jsr TEXT
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jsr HOME
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2018-07-18 13:27:26 +00:00
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2018-07-19 00:01:06 +00:00
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lda #0
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sta DRAW_PAGE
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2018-07-18 21:13:33 +00:00
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; GR part
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bit LORES
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bit SET_GR
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bit FULLGR
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2018-07-19 00:01:06 +00:00
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; Clear Page0
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lda #$00
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2018-07-19 00:09:23 +00:00
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sta DRAW_PAGE
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jsr clear_gr
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2018-07-19 00:01:06 +00:00
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2018-07-19 00:09:23 +00:00
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; draw border line
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2018-07-19 00:01:06 +00:00
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lda #$55
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ldy #38
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jsr hline
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2018-07-19 00:09:23 +00:00
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; Clear Page1
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lda #$4
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sta DRAW_PAGE
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jsr clear_gr
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2018-07-18 21:13:33 +00:00
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2018-07-19 00:09:23 +00:00
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; draw border line
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2018-07-18 21:13:33 +00:00
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2018-07-19 00:09:23 +00:00
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lda #$55
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ldy #38
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jsr hline
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2018-07-18 21:13:33 +00:00
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loop_forever:
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jmp loop_forever
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2018-07-18 13:27:26 +00:00
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2018-07-19 00:01:06 +00:00
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;==================================
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; HLINE
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;==================================
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; Color in A
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; X has which line
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hline:
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2018-07-19 00:09:23 +00:00
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pha ; 3
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2018-07-19 00:01:06 +00:00
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ldx gr_offsets,y ; 4+
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stx hline_loop+1 ; 4
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2018-07-19 00:09:23 +00:00
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lda gr_offsets+1,y ; 4+
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clc ; 2
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adc DRAW_PAGE ; 3
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sta hline_loop+2 ; 4
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pla ; 4
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2018-07-19 00:01:06 +00:00
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ldx #39 ; 2
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hline_loop:
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sta $5d0,X ; 38 ; 5
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dex ; 2
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bpl hline_loop ; 2nt/3
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rts ; 6
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2018-07-19 00:09:23 +00:00
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;==========================
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; Clear gr screen
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;==========================
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; Color in A
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clear_gr:
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ldy #46
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clear_page_loop:
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jsr hline
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dey
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dey
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bpl clear_page_loop
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rts
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2018-07-19 00:01:06 +00:00
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2018-07-18 21:13:33 +00:00
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; H E L L O
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.byte $D1,$00,$D1,$00, $D1,$01,$00, $D1,$00,$00, $D1,$00,$00, $D0,$01,$D0,$00
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.byte $24,$04,$24,$00, $24,$20,$00, $24,$20,$00, $24,$20,$00, $04,$20,$04,$00
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.byte $C9,$C0,$C9,$00, $C9,$C0,$00, $C9,$00,$00, $C9,$00,$00, $C9,$00,$C0,$00
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.byte $06,$00,$06,$00, $06,$00,$00, $06,$00,$00, $06,$00,$00, $06,$00,$06,$00
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2018-07-19 00:01:06 +00:00
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; move these to zero page for slight speed increase?
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gr_offsets:
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.word $400,$480,$500,$580,$600,$680,$700,$780
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.word $428,$4a8,$528,$5a8,$628,$6a8,$728,$7a8
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.word $450,$4d0,$550,$5d0,$650,$6d0,$750,$7d0
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