mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-07-03 16:29:56 +00:00
602 lines
11 KiB
ArmAsm
602 lines
11 KiB
ArmAsm
; Uses the 40x48d page1/page2 every-1-scanline pageflip mode
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; self modifying code to get some extra colors (pseudo 40x192 mode)
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; try adding some sound support
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; by deater (Vince Weaver) <vince@deater.net>
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.include "zp.inc"
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.include "hardware.inc"
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PT3_LOC = song
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start_rasterbars:
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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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sta DONE_PLAYING
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sta DONE_SONG
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lda #1
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sta LOOP
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;=================
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; Configure mockingboard
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;============================
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; Check for Apple II/II+/IIc
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;============================
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lda $FBB3 ; IIe and newer is $06
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cmp #6
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beq apple_iie_or_newer
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; Apple II/II+
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bne done_apple_detect
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apple_iie_or_newer:
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lda $FBC0 ; 0 on a IIc
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bne done_apple_detect
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apple_iic:
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; activate IIc mockingboard?
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; this might only be necessary to allow detection
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; I get the impression the Mockingboard 4c activates
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; when you access any of the 6522 ports in Slot 4
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lda #$ff
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sta $C403
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sta $C404
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; bypass the firmware interrupt handler
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; should we do this on IIe too? probably faster
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; sei ; disable interrupts
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; lda $c08b ; disable ROM (enable language card)
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; lda $c08b
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; lda #<interrupt_handler
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; sta $fffe
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; lda #>interrupt_handler
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; sta $ffff
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; lda #$EA ; nop out the "lda $45" in the irq hand
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; sta interrupt_smc
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; sta interrupt_smc+1
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done_apple_detect:
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;=======================
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; Detect mockingboard
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;========================
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; Note, we do this, but then ignore it, as sometimes
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; the test fails and then you don't get music.
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; In theory this could do bad things if you had something
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; easily confused in slot4, but that's probably not an issue.
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; print detection message
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; lda #<mocking_message ; load loading message
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; sta OUTL
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; lda #>mocking_message
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; sta OUTH
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; jsr move_and_print ; print it
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jsr mockingboard_detect_slot4 ; call detection routine
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cpx #$1
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beq mockingboard_found
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; lda #<not_message ; if not found, print that
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; sta OUTL
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; lda #>not_message
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; sta OUTH
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; inc CV
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; jsr move_and_print
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; jmp forever_loop ; and wait forever
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mockingboard_found:
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; lda #<found_message ; print found message
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; sta OUTL
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; lda #>found_message
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; sta OUTH
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; inc CV
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; jsr move_and_print
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;============================
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; Init the Mockingboard
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;============================
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jsr mockingboard_init
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jsr reset_ay_both
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jsr clear_ay_both
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;=========================
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; Setup Interrupt Handler
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;=========================
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; Vector address goes to 0x3fe/0x3ff
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; FIXME: should chain any existing handler
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; lda #<interrupt_handler
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; sta $03fe
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; lda #>interrupt_handler
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; sta $03ff
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;============================
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; Enable 50Hz clock on 6522
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;============================
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sei ; disable interrupts just in case
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lda #$40 ; Continuous interrupts, don't touch PB7
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sta $C40B ; ACR register
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lda #$7F ; clear all interrupt flags
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sta $C40E ; IER register (interrupt enable)
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lda #$C0
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sta $C40D ; IFR: 1100, enable interrupt on timer one oflow
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sta $C40E ; IER: 1100, enable timer one interrupt
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lda #$E7
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sta $C404 ; write into low-order latch
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lda #$4f
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sta $C405 ; write into high-order latch,
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; load both values into counter
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; clear interrupt and start counting
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; 4fe7 / 1e6 = .020s, 50Hz
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;==================
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; init song
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;==================
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jsr pt3_init_song
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;=============================
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; Load graphic page0
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lda #$0c
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sta BASH
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lda #$00
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sta BASL ; load image to $c00
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ldy #0
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lda pictures,Y
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sta GBASL
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lda pictures+1,Y
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sta GBASH
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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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; jsr wait_until_keypressed
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;=============================
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; Load graphic page1
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lda #$0c
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sta BASH
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lda #$00
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sta BASL ; load image to $c00
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ldy #0
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lda pictures+2,Y
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sta GBASL
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lda pictures+3,Y
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sta GBASH
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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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; jsr wait_until_keypressed
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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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; 5070 + 4550 = 9620
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; 9292
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; 12
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; 6
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; ====
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; 310
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; -3 for jmp
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; 307
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; Try X=14 Y=4 cycles=305R2
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nop
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ldy #4 ; 2
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loopA: ldx #14 ; 2
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loopB: dex ; 2
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bne loopB ; 2nt/3
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dey ; 2
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bne loopA ; 2nt/3
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jmp display_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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; each scan line 65 cycles
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; 1 cycle each byte (40cycles) + 25 for horizontal
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; Total of 12480 cycles to draw screen
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; Vertical blank = 4550 cycles (70 scan lines)
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; Total of 17030 cycles to get back to where was
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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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display_loop:
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.include "rasterbars_screen.s"
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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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; 4550 -- VBLANK
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; -582 -- erase 22+4*(8+6+126) = 582
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; -696 -- move+draw 4*(16+26+6+126) = 696
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; -10 -- keypress
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; -997 -- mockingboard out
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;=======
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; 2265
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pad_time:
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; we erase, then draw
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; doing a blanket erase of all 128 lines would cost 3459 cycles!
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;=========================
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; ERASE
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;=========================
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lda #$00 ; 2
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sta smc_raster_color1_1+1 ; 4
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sta smc_raster_color1_2+1 ; 4
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sta smc_raster_color2_1+1 ; 4
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sta smc_raster_color2_2+1 ; 4
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sta smc_raster_color3_1+1 ; 4
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;=============
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; 22
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; erase red
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lda red_x ; 4
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and #$7f ; 2
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tax ; 2
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jsr draw_rasterbar ; 6+126
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; erase yellow
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lda yellow_x ; 4
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and #$7f ; 2
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tax ; 2
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jsr draw_rasterbar ; 6+126
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; erase green
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lda green_x ; 4
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and #$7f ; 2
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tax ; 2
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jsr draw_rasterbar ; 6+126
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; erase red
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lda blue_x ; 4
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and #$7f ; 2
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tax ; 2
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jsr draw_rasterbar ; 6+126
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;=========================
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; MOVE and DRAW
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;=========================
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;============
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; move red
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ldy red_x ; 4
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lda movement_table,Y ; 4
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sta red_x ; 4
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and #$7f ; 2
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tax ; 2
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;==========
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; 16
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; draw red
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lda #$33 ; 2
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sta smc_raster_color1_1+1 ; 4
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sta smc_raster_color1_2+1 ; 4
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lda #$bb ; 2
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sta smc_raster_color2_1+1 ; 4
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sta smc_raster_color2_2+1 ; 4
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lda #$ff ; 2
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sta smc_raster_color3_1+1 ; 4
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;=============
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; 26
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jsr draw_rasterbar ; 6+126
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;============
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; move yellow
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ldy yellow_x ; 4
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lda movement_table,Y ; 4
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sta yellow_x ; 4
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and #$7f ; 2
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tax ; 2
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;==========
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; 16
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; draw yellow
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lda #$88 ; 2
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sta smc_raster_color1_1+1 ; 4
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sta smc_raster_color1_2+1 ; 4
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lda #$dd ; 2
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sta smc_raster_color2_1+1 ; 4
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sta smc_raster_color2_2+1 ; 4
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lda #$ff ; 2
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sta smc_raster_color3_1+1 ; 4
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;=============
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; 26
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jsr draw_rasterbar ; 6+126
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;============
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; move green
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ldy green_x ; 4
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lda movement_table,Y ; 4
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sta green_x ; 4
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and #$7f ; 2
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tax ; 2
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;==========
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; 16
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; draw green
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lda #$44 ; 2
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sta smc_raster_color1_1+1 ; 4
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sta smc_raster_color1_2+1 ; 4
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lda #$cc ; 2
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sta smc_raster_color2_1+1 ; 4
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sta smc_raster_color2_2+1 ; 4
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lda #$ff ; 2
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sta smc_raster_color3_1+1 ; 4
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;=============
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; 26
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jsr draw_rasterbar ; 6+126
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;============
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; move blue
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ldy blue_x ; 4
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lda movement_table,Y ; 4
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sta blue_x ; 4
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and #$7f ; 2
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tax ; 2
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;==========
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; 16
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; draw blue
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lda #$22 ; 2
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sta smc_raster_color1_1+1 ; 4
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sta smc_raster_color1_2+1 ; 4
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lda #$66 ; 2
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sta smc_raster_color2_1+1 ; 4
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sta smc_raster_color2_2+1 ; 4
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lda #$ff ; 2
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sta smc_raster_color3_1+1 ; 4
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;=============
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; 26
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jsr draw_rasterbar ; 6+126
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;============================
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; Play music
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;============================
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; jsr pt3_make_frame
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jsr mb_write_frame ; 6+921
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;============================
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; WAIT for VBLANK to finish
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;============================
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; Try X=112 Y=4 cycles=2265
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ldy #4 ; 2
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loop1: ldx #112 ; 2
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loop2: dex ; 2
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bne loop2 ; 2nt/3
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dey ; 2
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bne loop1 ; 2nt/3
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lda KEYPRESS ; 4
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bpl no_keypress ; 3
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jmp display_loop
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no_keypress:
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jmp display_loop ; 3
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;========================
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; Draw a rasterbar
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; unroll as memory is free! haha
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;========================
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; X is location
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; 2+22+24+24+24+24+6 = 126
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draw_rasterbar:
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ldy #0 ; 2
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;====
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lda y_lookup_l,X ; 4
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sta OUTL ; 3
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lda y_lookup_h,X ; 4
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sta OUTH ; 3
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smc_raster_color1_1:
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lda #$33 ; 2
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sta (OUTL),Y ; 6
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;============
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; 22
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inx ; 2
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lda y_lookup_l,X ; 4
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sta OUTL ; 3
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lda y_lookup_h,X ; 4
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sta OUTH ; 3
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smc_raster_color2_1:
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lda #$bb ; 2
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sta (OUTL),Y ; 6
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inx ; 2
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lda y_lookup_l,X ; 4
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sta OUTL ; 3
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lda y_lookup_h,X ; 4
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sta OUTH ; 3
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smc_raster_color3_1:
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lda #$ff ; 2
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sta (OUTL),Y ; 6
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inx
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lda y_lookup_l,X ; 4
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sta OUTL ; 3
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lda y_lookup_h,X ; 4
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sta OUTH ; 3
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smc_raster_color2_2:
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lda #$bb ; 2
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sta (OUTL),Y ; 6
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inx
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lda y_lookup_l,X ; 4
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sta OUTL ; 3
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lda y_lookup_h,X ; 4
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sta OUTH ; 3
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smc_raster_color1_2:
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lda #$33 ; 2
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sta (OUTL),Y ; 6
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rts ; 6
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.include "gr_simple_clear.s"
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.include "gr_offsets.s"
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.include "gr_unrle.s"
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.align $100
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.include "rasterbars_table.s"
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.include "movement_table.s"
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.include "gr_copy.s"
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.include "vapor_lock.s"
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.include "delay_a.s"
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pictures:
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.word rb_bg_low,rb_bg_high
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.include "rb_bg.inc"
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red_x: .byte $10
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yellow_x: .byte $20
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green_x: .byte $30
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blue_x: .byte $40
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;.include "interrupt_handler.s"
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.include "pt3_lib_ci.s"
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.include "mockingboard_a.s"
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;=============
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; include song
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;=============
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.align 256 ; must be on page boundary
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; this can be fixed but some changes would have
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; to be made throughout the player code
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song:
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.incbin "../pt3_player/music/EA.PT3"
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