mirror of
https://github.com/deater/dos33fsprogs.git
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745 lines
12 KiB
ArmAsm
745 lines
12 KiB
ArmAsm
;===============
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; VMW PT3 Player
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;===============
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; zero page definitions
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.include "zp.inc"
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.include "hardware.inc"
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; Location the files load at.
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; If you change this, you need to update the Makefile
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PT3_LOC = $4000
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; Number of files. Should probably detect this automatically
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NUM_FILES = 18
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;=============================
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; Setup
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;=============================
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pt3_setup:
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jsr HOME
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jsr TEXT
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bit LORES ; Lo-res graphics
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bit SET_GR
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bit TEXTGR ; split text/graphics
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jsr clear_screens
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;===============================
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; Check for Apple II/II+/IIe/IIc
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;===============================
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; this is used to see if we have lowecase support
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lda $FBB3 ; IIe and newer is $06
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cmp #6
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beq apple_iie_or_newer
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lda #$d0 ; set if older than a IIe
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sta apple_ii_smc
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bne done_apple_detect ; branch always
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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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; Init disk code
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;===============
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jsr rts_init
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;===============
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; init variables
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;===============
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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 WHICH_FILE
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sta LOOP
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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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; load first song
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;==================
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jsr new_song
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;============================
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; Init Background
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;============================
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jsr set_gr_page0
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jsr fire_init
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;============================
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; Enable 6502 interrupts
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;============================
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start_interrupts:
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cli ; clear interrupt mask
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;============================
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; Loop forever
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;============================
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main_loop:
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; Do the visualization
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jsr draw_fire_frame
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jsr put_letters
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jsr page_flip
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check_done:
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lda DONE_PLAYING
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asl ; bit 7 to carry, bit 6 to bit 7
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beq main_loop ; if was all zeros, loop
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bcs main_loop ; if high bit set, paused
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sei ; disable interrupts
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bmi minus_song ; if bit 6 set, then left pressed
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; else, either song finished or
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; right pressed
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plus_song:
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jsr increment_file
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bcc done_play ; branch always
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minus_song:
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jsr decrement_file
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done_play:
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lda #0
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sta DONE_PLAYING
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; clear the flame
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; FIXME: doesn't matter as we aren't displaying right now
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jsr fire_setline
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jsr new_song
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; re-enable the flame
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lda #7
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jsr fire_setline
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bmi start_interrupts
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;========================================
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;========================================
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; Helper routines below
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;========================================
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;========================================
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;=================
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; load a new song
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;=================
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new_song:
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;=========================
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; Init Variables
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;=========================
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; ?
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;===========================
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; Print loading message
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;===========================
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jsr clear_bottoms ; clear bottom of page 0/1
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lda #0 ; print LOADING message
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sta CH
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lda #21
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sta CV
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lda #<loading_message
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sta OUTL
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lda #>loading_message
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sta OUTH
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jsr print_both_pages
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;===========================
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; Load in PT3 file
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;===========================
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jsr get_filename
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lda #8 ; print filename to screen
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sta CH
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;lda #21
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;sta CV
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lda INL
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sta OUTL
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lda INH
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sta OUTH
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jsr print_both_pages
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; needs to be space-padded $A0 30-byte filename
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lda #<readfile_filename
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sta namlo
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lda #>readfile_filename
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sta namhi
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ldy #0
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ldx #30 ; 30 chars
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name_loop:
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lda (INL),Y
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beq space_loop
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ora #$80
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sta (namlo),Y
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iny
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dex
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bne name_loop
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beq done_name_loop
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space_loop:
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lda #$a0 ; pad with ' '
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sta (namlo),Y
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iny
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dex
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bne space_loop
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done_name_loop:
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; open and read a file
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; loads to whatever it was BSAVED at (default is $4000)
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jsr read_file ; read PT3 file from disk
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;=========================
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; Print Info
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;=========================
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jsr clear_bottoms ; clear bottom of page 0/1
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; NUL terminate the strings we want to print
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lda #0
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sta PT3_LOC+$3E
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sta PT3_LOC+$62
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upcase:
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; if Apple II/II+, uppercase the lowercase letters
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apple_ii_smc:
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beq no_uppercase
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ldy #$1e
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upcase_loop:
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lda PT3_LOC,Y
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cmp #$60
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bcc not_lowercase ; blt
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sbc #$20
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sta PT3_LOC,Y
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not_lowercase:
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iny
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cpy #$63
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bne upcase_loop
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no_uppercase:
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; print title
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lda #>(PT3_LOC+$1E) ; point to header title
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sta OUTH
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lda #<(PT3_LOC+$1E)
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sta OUTL
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lda #20 ; VTAB 20: HTAB 4
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sta CV
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lda #4
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sta CH
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jsr print_both_pages ; print, tail call
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; Print Author
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lda #<(PT3_LOC+$42)
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sta OUTL
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inc CV ; VTAB 21: HTAB 4
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jsr print_both_pages ; print, tail call
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; Print clock
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lda #>(clock_string) ; point to clock string
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sta OUTH
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lda #<(clock_string)
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sta OUTL
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lda #23 ; VTAB 23: HTAB 13
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sta CV
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lda #13
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sta CH
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jsr print_both_pages ; print, tail call
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; Print which file
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; first update with current values
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lda WHICH_FILE
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adc #$1
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ldy #0
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jsr convert_decimal
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lda #NUM_FILES
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ldy #3
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jsr convert_decimal
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; now print modified string
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lda #>(which_song_string) ; point to which song string
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sta OUTH
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lda #<(which_song_string)
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sta OUTL
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lda #0 ; HTAB 1
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sta CH
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jsr print_both_pages ; print, tail call
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; Print MHz indicator
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lda #>(mhz_string) ; point to MHz string
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sta OUTH
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lda #<(mhz_string)
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sta OUTL
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lda #34 ; HTAB 34
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sta CH
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jsr print_both_pages ; print, tail call
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; update the MHz indicator with current state
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ldx #'0'+$80
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lda convert_177_smc1
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cmp #$18
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beq done_MHz
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ldx #'7'+$80
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done_MHz:
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stx $7F4
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stx $BF4
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; Print Left Arrow (INVERSE)
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lda #'<'
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sta $6D0
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sta $AD0
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lda #'-'
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sta $6D1
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sta $AD1
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; Print Rright Arrow (INVERSE)
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sta $6F6
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sta $AF6
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lda #'>'
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sta $6F7
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sta $AF7
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jsr pt3_init_song
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;=================================
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; Calculate Length of Song
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;=================================
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; There's no easy way to do this? (???)
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; We walk through the song counting frames
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; We can't even do this quickly, as the number of frames
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; per pattern can vary, and you have to parse a channel
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; to see this, and channel data is varying-width and so
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; you have to parse it all.
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; Time is just number of frames/50Hz
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sta current_pattern_smc+1
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frame_count_loop_store:
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sta current_line_smc+1
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sta current_subframe_smc+1
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frame_count_loop:
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lda current_line_smc+1
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ora current_subframe_smc+1
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bne fc_pattern_good
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; load a new pattern in
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jsr pt3_set_pattern
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lda DONE_SONG
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bne done_counting
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fc_pattern_good:
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ldx current_subframe_smc+1 ;;ldx #(NOTE_STRUCT_SIZE*0)
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bne fc_line_good
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; we only calc length of chanel A, hopefully enough
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lda #1
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sta pt3_pattern_done_smc+1
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; decode_note(&pt3->a,&(pt3->a_addr),pt3);
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jsr decode_note
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lda pt3_pattern_done_smc+1
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bne fc_line_good
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inc current_pattern_smc+1 ; increment pattern
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bne frame_count_loop_store ; branch always
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fc_line_good:
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inc current_subframe_smc+1 ; subframe++
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lda current_subframe_smc+1
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eor pt3_speed_smc+1 ; if we hit pt3_speed, move to next
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bne fc_do_frame
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fc_next_line:
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sta current_subframe_smc+1 ; reset subframe to 0
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inc current_line_smc+1 ; and increment line
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lda current_line_smc+1
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eor #64 ; always end at 64.
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bne fc_do_frame ; is this always needed?
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fc_next_pattern:
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sta current_line_smc+1 ; reset line to 0
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inc current_pattern_smc+1 ; increment pattern
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fc_do_frame:
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inc time_frame_smc+1
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time_frame_smc:
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lda #$00
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eor #50
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bne frame_count_loop
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sta time_frame_smc+1
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; see if overflow low s
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ldx $BD0+13+10
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cpx #'9'+$80
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bne inc_low_s
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; see if overflow high s
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ldx $BD0+13+9
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cpx #'5'+$80
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bne inc_high_s
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inc $7D0+13+7
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inc $BD0+13+7
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ldx #'0'+$80-1
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inc_high_s:
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inx
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stx $7D0+13+9
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stx $BD0+13+9
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clear_low_s:
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ldx #'0'+$80-1
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inc_low_s:
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inx
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stx $7D0+13+10
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stx $BD0+13+10
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inc_done:
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fc_bayern:
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bne frame_count_loop
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done_counting:
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; re-init, as we've run through it
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lda #0
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sta DONE_PLAYING
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sta current_pattern_smc+1
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jmp pt3_init_song
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;==================
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; Get filename
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;==================
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; WHICH_FILE holds number
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; MAX_FILES has max
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; Scroll through until find
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; point INH:INL to it
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get_filename:
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ldy #0
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lda #<song_list ; point to filename
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sta INL
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lda #>song_list
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sta INH
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ldx WHICH_FILE
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beq filename_found
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get_filename_loop:
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inner_loop:
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iny
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lda (INL),Y
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bne inner_loop
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iny
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dex
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bne get_filename_loop
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filename_found:
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tya
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clc
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adc INL
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sta INL
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bcc skip_inh_inc
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inc INH
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skip_inh_inc:
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rts
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;===============================
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; Increment file we want to load
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;===============================
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increment_file:
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inc WHICH_FILE
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lda WHICH_FILE
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eor #NUM_FILES
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bne done_increment
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sta WHICH_FILE
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done_increment:
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rts
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;===============================
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; Decrement file we want to load
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;===============================
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decrement_file:
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dec WHICH_FILE
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bpl done_decrement
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lda #(NUM_FILES-1)
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sta WHICH_FILE
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done_decrement:
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rts
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;=========================
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; convert_decimal
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;=========================
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; convert byte (<100) to tens/ones decimal
|
|
; this is probably not the optimal way to do this
|
|
; value in A, output in ASCII+$80 in which_10s:which_1s
|
|
; trashes X
|
|
convert_decimal:
|
|
|
|
ldx #'0'+$80
|
|
stx which_1s_smc+1
|
|
stx which_10s_smc+1
|
|
|
|
tax ; special case zero
|
|
beq conv_decimal_done
|
|
conv_decimal_loop:
|
|
inc which_1s_smc+1
|
|
which_1s_smc:
|
|
lda #$d1
|
|
cmp #':'+$80
|
|
bne conv_decimal_not_10
|
|
lda #'0'+$80
|
|
sta which_1s_smc+1
|
|
inc which_10s_smc+1
|
|
conv_decimal_not_10:
|
|
dex
|
|
bne conv_decimal_loop
|
|
|
|
conv_decimal_done:
|
|
which_10s_smc:
|
|
lda #$d1
|
|
sta which_song_string,y
|
|
lda which_1s_smc+1
|
|
sta which_song_string+1,y
|
|
rts
|
|
|
|
|
|
|
|
;==========
|
|
; filenames
|
|
;==========
|
|
|
|
song_list:
|
|
|
|
.include "song_list.inc"
|
|
|
|
;=========
|
|
;routines
|
|
;=========
|
|
.include "gr_offsets.s"
|
|
.include "text_print.s"
|
|
.include "mockingboard_a.s"
|
|
.include "gr_fast_clear.s"
|
|
.include "pageflip.s"
|
|
.include "gr_setpage.s"
|
|
.include "qkumba_rts.s"
|
|
.include "keypress_minimal.s"
|
|
.include "interrupt_handler.s"
|
|
.include "pt3_lib.s"
|
|
.include "fire.s"
|
|
.include "random16.s"
|
|
.include "gr_putsprite.s"
|
|
.include "put_letters.s"
|
|
|
|
;=========
|
|
; strings
|
|
;=========
|
|
;mocking_message: .asciiz "LOOKING FOR MOCKINGBOARD IN SLOT #4"
|
|
not_message: .byte "NOT "
|
|
found_message: .asciiz "FOUND"
|
|
;done_message: .asciiz "DONE PLAYING"
|
|
loading_message: .asciiz "LOADING"
|
|
clock_string: .asciiz "0:00 / 0:00"
|
|
mhz_string: .asciiz "1.7MHZ"
|
|
which_song_string: .asciiz "00/00"
|