mirror of https://github.com/mi57730/a2d.git
634 lines
15 KiB
ArmAsm
634 lines
15 KiB
ArmAsm
.setcpu "6502"
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.include "apple2.inc"
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.include "../inc/apple2.inc"
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.include "../inc/prodos.inc"
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.include "../inc/macros.inc"
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DESKTOP_INIT := $0800 ; init location
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L7ECA := $7ECA ; ???
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;;; ============================================================
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;;; Patch self in as ProDOS QUIT routine (LCBank2 $D100)
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;;; and invoke QUIT. Note that only $200 bytes are copied.
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.proc install_as_quit
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.org $2000
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src := quit_routine
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dst := SELECTOR
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lda LCBANK2
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lda LCBANK2
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ldy #$00
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loop: lda src,y
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sta dst,y
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lda src+$100,y
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sta dst+$100,y
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dey
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bne loop
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lda ROMIN2
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MLI_CALL QUIT, quit_params
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DEFINE_QUIT_PARAMS quit_params
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.endproc ; install_as_quit
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;;; ============================================================
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;;; New QUIT routine. Gets relocated to $1000 by ProDOS before
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;;; being executed.
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.proc quit_routine
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.org $1000
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self:
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jmp start
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reinstall_flag: ; set once prefix saved and reinstalled
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.byte 0
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.byte "Mouse Desk"
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.byte 0
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splash_string:
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PASCAL_STRING "Loading Apple II DeskTop"
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filename:
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PASCAL_STRING "DeskTop2"
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DEFINE_READ_PARAMS read_params, $1E00, $400 ; so the $200 byte mark ends up at $2000
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DEFINE_CLOSE_PARAMS close_params
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DEFINE_SET_PREFIX_PARAMS prefix_params, prefix_buffer
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DEFINE_OPEN_PARAMS open_params, filename, $1A00
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start: lda ROMIN2
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;; Show a splash message on 80 column text screen
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jsr SETVID
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jsr SETKBD
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sta CLR80VID
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sta SETALTCHAR
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sta CLR80COL
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jsr SLOT3ENTRY
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jsr HOME
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lda #$00 ; IIgs specific ???
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sta SHADOW
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lda #$40
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sta RAMWRTON
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sta $0100 ; ???
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sta $0101 ; ???
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sta RAMWRTOFF
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lda #12 ; VTAB 12
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sta CV
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jsr VTAB
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lda #80 ; HTAB (80-width)/2
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sec ; to center
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sbc splash_string
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lsr a
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sta CH
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ldy #$00
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: lda splash_string+1,y
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ora #$80
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jsr COUT
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iny
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cpy splash_string
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bne :-
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;; Close all open files (???)
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MLI_CALL CLOSE, close_params
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;; Initialize system memory bitmap
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ldx #BITMAP_SIZE-1
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lda #$01 ; Protect ProDOS global page
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sta BITMAP,x
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dex
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lda #$00
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: sta BITMAP,x
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dex
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bpl :-
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lda #%11001111 ; Protect ZP, stack, Text Page 1
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sta BITMAP
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lda reinstall_flag
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bne no_reinstall
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;; Re-install quit routine (with prefix memorized)
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MLI_CALL GET_PREFIX, prefix_params
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beq :+
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jmp crash
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: lda #$FF
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sta reinstall_flag
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copy16 IRQ_VECTOR, irq_saved
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lda LCBANK2
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lda LCBANK2
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ldy #0
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: lda self,y
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sta SELECTOR,y
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lda self+$100,y
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sta SELECTOR+$100,y
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dey
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bne :-
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lda ROMIN2
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jmp done_reinstall
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no_reinstall:
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copy16 irq_saved, IRQ_VECTOR
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done_reinstall:
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;; Set the prefix, read the first $400 bytes of this system
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;; file in (at $1E00), and invoke $200 bytes into it (at $2000)
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MLI_CALL SET_PREFIX, prefix_params
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beq :+
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jmp prompt_for_system_disk
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: MLI_CALL OPEN, open_params
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beq :+
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jmp crash
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: lda open_params::ref_num
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sta read_params::ref_num
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MLI_CALL READ, read_params
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beq :+
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jmp crash
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: MLI_CALL CLOSE, close_params
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beq :+
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jmp crash
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: jmp $2000 ; Invoke system file
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;; Display a string, and wait for Return keypress
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prompt_for_system_disk:
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jsr SLOT3ENTRY ; 80 column mode
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jsr HOME
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lda #12 ; VTAB 12
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sta CV
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jsr VTAB
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lda #80 ; HTAB (80 - width)/2
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sec ; to center the string
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sbc disk_prompt
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lsr a
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sta CH
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ldy #$00
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: lda disk_prompt+1,y
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ora #$80
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jsr COUT
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iny
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cpy disk_prompt
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bne :-
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wait: sta KBDSTRB
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: lda KBD
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bpl :-
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and #CHAR_MASK
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cmp #$0D ; Return
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bne wait
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jmp start
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disk_prompt:
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PASCAL_STRING "Insert the system disk and Press Return."
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irq_saved:
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.addr 0
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crash: sta $6 ; Crash?
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jmp MONZ
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prefix_buffer:
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.res 64, 0
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.endproc ; quit_routine
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;;; ============================================================
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;;; This chunk is invoked at $2000 after the quit handler has been invoked
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;;; and updated itself. Using the segment_*_tables below, this loads the
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;;; DeskTop application into various parts of main, aux, and bank-switched
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;;; memory, then invokes the DeskTop initialization routine.
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.proc install_segments
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;; Pad to be at $200 into the file
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.res $200 - (.sizeof(install_as_quit) + .sizeof(quit_routine)), 0
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.org $2000
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jmp start
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DEFINE_OPEN_PARAMS open_params, filename, $3000
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DEFINE_READ_PARAMS read_params, 0, 0
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DEFINE_CLOSE_PARAMS close_params
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DEFINE_SET_MARK_PARAMS set_mark_params, $580 ; This many bytes before the good stuff.
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filename:
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PASCAL_STRING "DeskTop2"
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;;; Consecutive segments are loaded, |size| bytes are loaded at |addr|
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;;; then relocated to |dest| according to |type|.
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;;; Segments are:
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;;; $4000 aux - MGTK and DeskTop code
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;;; $D000 aux/banked - DeskTop code callable from main, and resources
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;;; $FB00 aux/banked - more DeskTop resources (icons, strings, etc)
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;;; $4000 main - more DeskTop code
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;;; $0800 main - DeskTop initialization code; later overwritten by DAs
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;;; $0290 main - Routine to invoke other programs
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segment_addr_table:
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.word $3F00,$4000,$4000,$4000,$0800,$0290
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segment_dest_table:
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.addr $4000,$D000,$FB00,$4000,$0800,$0290
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segment_size_table:
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.word $8000,$1D00,$0500,$7F00,$0800,$0160
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segment_type_table: ; 0 = main, 1 = aux, 2 = banked (aux)
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.byte 1,2,2,0,0,0
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num_segments:
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.byte 6
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start:
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;; Configure system bitmap - everything is available
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ldx #BITMAP_SIZE-1
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lda #0
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: sta BITMAP+1,x
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dex
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bpl :-
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;; Open this system file
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MLI_CALL OPEN, open_params
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beq :+
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brk ; crash
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: lda open_params::ref_num
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sta set_mark_params::ref_num
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sta read_params::ref_num
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MLI_CALL SET_MARK, set_mark_params
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beq :+
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brk ; crash
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: lda #0
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sta segment_num
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loop: lda segment_num
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cmp num_segments
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bne continue
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;; Close and invoke DeskTop init routine
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MLI_CALL CLOSE, close_params
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beq :+
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brk ; crash
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: jmp DESKTOP_INIT
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continue:
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asl a
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tax
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copy16 segment_addr_table,x, read_params::data_buffer
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copy16 segment_size_table,x, read_params::request_count
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MLI_CALL READ, read_params
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beq :+
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brk ; crash
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: ldx segment_num
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lda segment_type_table,x
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beq next_segment ; type 0 = main, so done
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cmp #2
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beq :+
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jsr aux_segment
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jmp next_segment
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: jsr banked_segment
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next_segment:
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inc segment_num
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jmp loop
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segment_num: .byte 0
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;; Handle bank-switched memory segment
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.proc banked_segment
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src := $6
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dst := $8
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sta ALTZPON
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lda LCBANK1
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lda LCBANK1
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lda #$80 ; ???
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sta $0100
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sta $0101
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lda #0
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sta src
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sta dst
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lda segment_num
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asl a
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tax
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lda segment_dest_table+1,x
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sta dst+1
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lda read_params::data_buffer+1
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sta src+1
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clc
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adc segment_size_table+1,x
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sta max_page
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lda segment_size_table,x
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beq :+
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inc max_page
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: ldy #0
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loop: lda (src),y
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sta (dst),y
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iny
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bne loop
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inc src+1
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inc dst+1
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lda src+1
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cmp max_page
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bne loop
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sta ALTZPOFF
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lda ROMIN2
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rts
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max_page:
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.byte 0
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.endproc
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;; Handle aux memory segment
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.proc aux_segment
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src := $6
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dst := $8
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lda #0
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sta src
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sta dst
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lda segment_num
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asl a
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tax
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lda segment_dest_table+1,x
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sta dst+1
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lda read_params::data_buffer+1
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sta src+1
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clc
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adc segment_size_table+1,x
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sta max_page
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sta RAMRDOFF
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sta RAMWRTON
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ldy #0
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loop: lda (src),y
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sta (dst),y
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iny
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bne loop
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inc src+1
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inc dst+1
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lda src+1
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cmp max_page
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bne loop
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sta RAMWRTOFF
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rts
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max_page:
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.byte 0
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.endproc
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PAD_TO $2200
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.endproc ; install_segments
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;;; ============================================================
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;;; Not sure where this could be invoked from
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.proc dump_screen
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.org $280
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SLOT1 := $C100
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hbasl := $6
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screen_width = 560
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screen_height = 192
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;; Test for OpenApple+SolidApple+P
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pha
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lda BUTN0
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and BUTN1
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bpl :+
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lda KBD
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cmp #('P' | $80)
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beq invoke
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: pla
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jmp L7ECA ; ???
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invoke: sta KBDSTRB
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sta SET80COL
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sta SET80VID
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sta DHIRESON
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lda TXTCLR
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lda HIRES
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sta ALTZPOFF
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sta ROMIN2
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lda #0
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sta y_row
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jmp print_screen
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.proc send_spacing
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ldy #0
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: lda spacing_sequence,y
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beq done
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jsr cout
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iny
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jmp :-
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done: rts
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.endproc
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.proc send_restore_state
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ldy #$00
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: lda restore_state,y
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beq done
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jsr cout
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iny
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jmp :-
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done: rts
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.endproc
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.proc send_init_graphics
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ldx #0
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: lda init_graphics,x
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jsr cout
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inx
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cpx #6
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bne :-
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rts
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init_graphics:
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.byte CHAR_ESCAPE,"G0560" ; Graphics, 560 data bytes
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.endproc
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.proc send_row
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;; Tell printer to expect graphics
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jsr send_init_graphics
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ldy #0
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sty col_num
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lda #1
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sta mask
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lda #0
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sta x_coord
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sta x_coord+1
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col_loop:
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lda #8 ; 8 vertical pixels per row
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sta count
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lda y_row
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sta y_coord
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;; Accumulate 8 pixels
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y_loop: lda y_coord
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jsr compute_hbasl ; Row address in screen
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lda col_num
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lsr a ; Even or odd column?
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tay
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sta PAGE2OFF ; By default, read main mem $2000-$3FFF
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bcs :+ ; But even columns come from aux, so...
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sta PAGE2ON ; Read aux mem $2000-$3FFF
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: lda (hbasl),y ; Grab the whole byte
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and mask ; Isolate the pixel we care about
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cmp #1 ; Set carry if non-zero
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ror accum ; And slide it into place
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inc y_coord
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dec count
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bne y_loop
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;; Send the 8 pixels to the printer.
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lda accum ; Now output it
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eor #$FF ; Invert pixels (screen vs. print)
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sta PAGE2OFF ; Read main mem $2000-$3FFF
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jsr cout ; And actually print
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;; Done all pixels across?
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lda x_coord
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cmp #<(screen_width-1)
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bne :+
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lda x_coord+1
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cmp #>(screen_width-1)
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beq done
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;; Next pixel to the right
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: asl mask
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bpl :+ ; Only 7 pixels per column
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lda #1
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sta mask
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inc col_num
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: inc x_coord
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bne col_loop
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inc x_coord+1
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bne col_loop
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done: sta PAGE2OFF ; Read main mem $2000-$3FFF
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rts
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.endproc
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.proc print_screen
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;; Init printer
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jsr pr_num_1
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jsr send_spacing
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;; Print a row (560x8), CR+LF
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loop: jsr send_row
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lda #CHAR_RETURN
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jsr cout
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lda #CHAR_DOWN
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jsr cout
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lda y_coord
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sta y_row
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cmp #screen_height
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bcc loop
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;; Finish up
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lda #CHAR_RETURN
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jsr cout
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lda #CHAR_RETURN
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jsr cout
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jsr send_restore_state
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sta ALTZPON
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lda LCBANK1
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lda LCBANK1
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rts
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.endproc
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;; Given y-coordinate in A, compute HBASL-equivalent
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.proc compute_hbasl
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pha
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and #$C7
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eor #$08
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sta $07
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and #$F0
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lsr a
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lsr a
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lsr a
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sta hbasl
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pla
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and #$38
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asl a
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asl a
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eor hbasl
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asl a
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rol hbasl+1
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asl a
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rol hbasl+1
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eor hbasl
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sta hbasl
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rts
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.endproc
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.proc pr_num_1
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lda #>SLOT1
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sta COUT_HOOK+1
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lda #<SLOT1
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sta COUT_HOOK
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lda #(CHAR_RETURN | $80)
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jsr invoke_slot1
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rts
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.endproc
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.proc cout
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jsr COUT
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rts
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.endproc
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y_row: .byte 0 ; y-coordinate of row start (0, 8, ...)
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x_coord:.word 0 ; x-coordinate of pixels being accumulated
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y_coord:.byte 0 ; iterates y_row to y_row+7
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mask: .byte 0 ; mask for pixel being processed
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accum: .byte 0 ; accumulates pixels for output
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count: .byte 0 ; 8...1 while a row is output
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col_num:.byte 0 ; 0...79
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.byte 0, 0
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spacing_sequence:
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.byte CHAR_ESCAPE,'e' ; 107 DPI (horizontal)
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.byte CHAR_ESCAPE,"T16" ; distance between lines (16/144")
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.byte CHAR_TAB,$4C,$20,$44,$8D ; ???
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.byte CHAR_TAB,$5A,$8D ; ???
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.byte 0
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restore_state:
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.byte CHAR_ESCAPE,'N' ; 80 DPI (horizontal)
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.byte CHAR_ESCAPE,"T24" ; distance between lines (24/144")
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.byte 0
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invoke_slot1:
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jmp SLOT1
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PAD_TO $400
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.endproc ; dump_screen
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.assert .sizeof(install_as_quit) + .sizeof(quit_routine) + .sizeof(install_segments) + .sizeof(dump_screen) = $580, error, "Size mismatch"
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