mirror of
https://github.com/deater/dos33fsprogs.git
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220 lines
4.3 KiB
ArmAsm
220 lines
4.3 KiB
ArmAsm
;=================
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; VMW PT3_LIB test
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;=================
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; template for using the pt3_lib
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; zero page definitions
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.include "zp.inc"
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; some firmware locations
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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 = song
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; the below will make for more compact code, at the expense
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; of using $80 - $ff by our routines. You'll also need to
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; grab the zp.inc file from the pt3_player code
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; PT3_USE_ZERO_PAGE = 1
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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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;===========================
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; Check for Apple IIc
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;===========================
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; it does interrupts differently
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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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jmp 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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; init variables
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;===============
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lda #0
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sta DONE_PLAYING
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sta LOOP
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;=======================
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; Detect mockingboard
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;========================
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; print detection message
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ldy #0
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print_mocking_message:
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lda mocking_message,Y ; load loading message
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beq done_mocking_message
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ora #$80
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jsr COUT
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iny
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jmp print_mocking_message
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done_mocking_message:
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jsr CROUT1
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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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ldy #0
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print_not_message:
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lda not_message,Y ; load loading message
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beq forever_loop
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ora #$80
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jsr COUT
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iny
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jmp print_not_message
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mockingboard_found:
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ldy #0
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print_found_message:
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lda found_message,Y ; load loading message
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beq done_found_message
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ora #$80
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jsr COUT
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iny
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jmp print_found_message
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done_found_message:
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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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; 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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forever_loop:
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jmp forever_loop
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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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; vars
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;=========
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;=========
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;routines
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;=========
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.include "mockingboard_a.s"
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.include "interrupt_handler.s"
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.include "pt3_lib_core.s"
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.include "pt3_lib_init.s"
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;=========
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; strings
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;=========
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mocking_message: .asciiz "LOOKING FOR MOCKINGBOARD IN SLOT #4"
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not_message: .byte "NOT "
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found_message: .asciiz "FOUND"
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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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;.incbin "../ootw/ootw_audio/ootw_outro.pt3"
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