mirror of
https://github.com/a2stuff/prodos-drivers.git
synced 2024-11-19 01:10:43 +00:00
ace258d862
I discovered that Bird's Better Bye and the ProDOS 1.9 selector are different. Documentation updated with the history to the best of my knowledge.
593 lines
14 KiB
ArmAsm
593 lines
14 KiB
ArmAsm
;;; Disassembly of Bird's Better Bye, 40 column program selector
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;;; (Found in a copy of ProDOS 1.8, but not believed to be original?)
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;;;
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;;; Installer wrapper added by Joshua Bell inexorabletash@gmail.com
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.setcpu "65C02"
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.linecont +
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.feature string_escapes
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.include "apple2.inc"
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.include "apple2.mac"
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.include "../inc/apple2.inc"
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.include "../inc/macros.inc"
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.include "../inc/prodos.inc"
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.include "../inc/ascii.inc"
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;;; ************************************************************
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.include "../inc/driver_preamble.inc"
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;;; ************************************************************
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;;; ------------------------------------------------------------
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;;; ProDOS Technical Reference Manual, 5.1.5.2:
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;;;
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;;; ProDOS MLI call $65, the QUIT call, moves addresses $D100 through
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;;; $D3FF from the second 4K bank of RAM of the language card to
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;;; $1000, and executes a JMP to $1000. What initially resides in that
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;;; area is Apple's dispatcher code.
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;;; ------------------------------------------------------------
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;;; Installer
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;;; ------------------------------------------------------------
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max_size = $300
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.proc maybe_install_driver
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src := install_src
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end := install_src + install_size
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dst := $D100 ; Install location in ProDOS (bank 2)
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src_ptr := $19
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dst_ptr := $1B
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sta ALTZPOFF
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lda ROMIN
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lda ROMIN
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lda #>src
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sta src_ptr+1
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lda #<src
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sta src_ptr
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lda #>dst
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sta dst_ptr+1
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lda #<dst
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sta dst_ptr
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loop: lda (src_ptr)
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sta (dst_ptr)
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inc src_ptr
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bne :+
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inc src_ptr+1
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: inc dst_ptr
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bne :+
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inc dst_ptr+1
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: lda src_ptr+1
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cmp #>end
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bne loop
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lda src_ptr
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cmp #<end
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bne loop
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lda (src_ptr)
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sta (dst_ptr)
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sta ALTZPOFF
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sta ROMINWB1
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sta ROMINWB1
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rts
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.endproc
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;;; ------------------------------------------------------------
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;;; Selector
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;;; ------------------------------------------------------------
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install_src := *
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pushorg $1000
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.proc bbb
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PREFIX := $280
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kMaxFilesDisplayed = 16
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filename_table := $1700
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device := $6 ; current device index (in DEVLST)
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name_len := $8
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index := $9 ; current displayed file index
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name_ptr := $D
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num_files := $F ; number of displayed files
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type_table := $10 ; one entry per line, high bit set if SYS
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;; Copied from directory header
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entry_length := $A5
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entries_per_block := $A6
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file_count := $A7
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entry_index := $A9 ; within "block"
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dir_buf := SYS_ADDR
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;;; ============================================================
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;;; Code
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;;; ============================================================
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;; Signal to ProDOS that this is modified.
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cld
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inc $03F4 ; ???
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;; Page in normal banks, reset screen to 40 columns.
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lda ROMIN2
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jsr SETTXT
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jsr SETVID
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jsr SETKBD
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jsr SETNORM
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sta CLR80VID
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sta CLRALTCHAR
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sta CLR80COL
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;; Clear system bitmap.
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lda #$01
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sta BITMAP+BITMAP_SIZE-1
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lda #$00
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ldx #BITMAP_SIZE-2
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: sta BITMAP,x
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dex
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bpl :-
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lda #$CF
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sta BITMAP
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lda default_devnum
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beq :+ ; always?
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sta DEVNUM
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: ldx DEVCNT
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: stx device
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lda DEVLST,x
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and #$F0
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cmp DEVNUM
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beq set_devnum
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dex
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bpl :-
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next_drive:
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ldx device
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cpx DEVCNT
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bcc :+
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ldx #$FF
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: inx
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stx device
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lda DEVLST,x
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set_devnum:
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sta on_line_unit_num
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sta DEVNUM
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jsr HOME
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MLI_CALL ON_LINE, on_line_params
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bcs error_relay
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lda PREFIX+1
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and #$0F
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beq error_relay
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adc #$02
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sta PREFIX
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tax
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set_prefix_length:
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lda #'/'
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sta PREFIX+1
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sta PREFIX,x
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lda #0
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sta PREFIX+1,x
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sta index
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sta read_request_count+1
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sta set_mark_position+1
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sta set_mark_position+2
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ldx #msg_select_drive
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lda #10 ; HTAB
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jsr ShowMessage
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ldx #msg_select_file
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lda #9 ; HTAB
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jsr ShowMessage
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;; Show current prefix
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ldx #0
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: lda PREFIX+1,x
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beq :+
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jsr Cout
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inx
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bne :-
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: MLI_CALL OPEN, open_params
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error_relay:
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bcs next_drive_on_error
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jsr AssignRefNum
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lda #.sizeof(SubdirectoryHeader)
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sta read_request_count
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MLI_CALL READ, read_params
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bcs next_drive_on_error
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ldx #3
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: lda dir_buf + SubdirectoryHeader::entry_length,x
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sta entry_length,x
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dex
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bpl :-
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sta read_request_count
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lda #1
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sta entry_index
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lda file_count ; empty?
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ora file_count+1
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bne next_file
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: jmp finish_dir ; empty!
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;; Loop over file entries
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next_file:
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bit file_count+1 ; negative?
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bmi :-
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skip: lda set_mark_position+1
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and #$FE
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sta set_mark_position+1
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ldy entry_index
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lda #0
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cpy entries_per_block
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bcc next_entry_in_block
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tay
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sty entry_index
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inc set_mark_position+1 ; next block - two pages
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: inc set_mark_position+1
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next_entry_in_block:
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dey
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clc
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bmi next_block
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adc entry_length
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bcc next_entry_in_block
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bcs :- ; always
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next_block:
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adc #4 ; skip prev/next block pointers
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sta set_mark_position
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MLI_CALL SET_MARK, get_eof_params
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next_drive_on_error:
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bcs do_next_drive
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MLI_CALL READ, read_params
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bcs do_next_drive
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inc entry_index
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lda dir_buf
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beq skip ; deleted entry
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and #NAME_LENGTH_MASK
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sta dir_buf
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dec file_count
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bne :+
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dec file_count+1
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: ror dir_buf + FileEntry::access ; check low bit
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bcc next_file
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lda dir_buf + FileEntry::file_type
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cmp #FT_DIRECTORY
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beq :+
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cmp #FT_SYSTEM
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bne next_file
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: ldx index
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cpx #kMaxFilesDisplayed
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bcs finish_dir
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sta type_table,x
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jsr SetNamePtrAndLen
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ldy #$0F ; max name length
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: lda dir_buf,y
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sta (name_ptr),y
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dey
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bpl :-
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jsr DisplayFilename
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inc index
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jmp next_file
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;;; ============================================================
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do_next_drive:
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jmp next_drive
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up_dir:
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ldx PREFIX
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: dex
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beq input_loop
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lda PREFIX,x
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cmp #'/'
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bne :-
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dex
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beq input_loop
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stx PREFIX
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set_new_prefix:
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inc PREFIX
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jsr HOME
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ldx PREFIX
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jmp set_prefix_length
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select_next_file:
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jsr DisplayFilename
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ldx index
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inx
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cpx num_files
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bcc set_index
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ldx #0
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beq set_index ; always
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select_prev_file:
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jsr DisplayFilename
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ldx index
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bne :+
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ldx num_files
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: dex
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set_index:
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stx index
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jmp redisplay_selection
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finish_dir:
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MLI_CALL CLOSE, close_params
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next_drive_relay:
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bcs do_next_drive
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lda index
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beq do_next_drive
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sta num_files
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lda #0
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sta index
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redisplay_selection:
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jsr SETINV
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jsr DisplayFilename
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jsr SETNORM
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;; fall through
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;;; ============================================================
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input_loop:
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lda KBD
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bpl input_loop
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sta KBDSTRB
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cmp #HI(ASCII_TAB)
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beq do_next_drive
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cmp #HI(ASCII_LEFT)
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beq select_prev_file
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cmp #HI(ASCII_UP)
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beq select_prev_file
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cmp #HI(ASCII_RIGHT)
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beq select_next_file
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cmp #HI(ASCII_DOWN)
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beq select_next_file
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cmp #HI(ASCII_ESCAPE)
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beq up_dir
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cmp #HI(ASCII_CR)
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bne input_loop
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lda BUTN0
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bpl SelectFile
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lda ROMIN
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lda ROMIN
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lda DEVNUM
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sta $D3A6
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lda ROMIN2
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jmp input_loop
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;;; ============================================================
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.proc SelectFile
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MLI_CALL SET_PREFIX, set_prefix_params
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bcs next_drive_relay
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jsr SetNamePtrAndLen
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ldx PREFIX
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: iny
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lda (name_ptr),y
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inx
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sta PREFIX,x
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cpy name_len
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bcc :-
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stx PREFIX
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ldy index
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lda type_table,y
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bmi InvokeSystemFile
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jmp set_new_prefix
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.endproc
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;;; ============================================================
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.proc InvokeSystemFile
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MLI_CALL OPEN, open_params
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: bcs next_drive_relay
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jsr AssignRefNum
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MLI_CALL GET_EOF, get_eof_params
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bcs :-
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lda get_eof_eof
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sta read_request_count
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lda get_eof_eof+1
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sta read_request_count+1
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MLI_CALL READ, read_params
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php
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MLI_CALL CLOSE, close_params
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bcc :+
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pla
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err: jmp do_next_drive
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: plp
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bcs err
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jmp SYS_ADDR
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.endproc
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;;; ============================================================
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;;; Call with HTAB in A, message table offset in X
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.proc ShowMessage
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sta CH
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: lda message_table,x
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beq done
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jsr Cout
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inx
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bne :-
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done: rts
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.endproc
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;;; ============================================================
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.proc Cout
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ora #$80
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jmp COUT1
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.endproc
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;;; ============================================================
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.proc SetNamePtrAndLen
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lda index
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asl a ; * 16 (name length)
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asl a
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asl a
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asl a
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sta name_ptr
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lda #>filename_table
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sta name_ptr+1
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ldy #$00
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lda (name_ptr),y
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sta name_len
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rts
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.endproc
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;;; ============================================================
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.proc DisplayFilename
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lda #5
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sta CH
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lda index
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clc
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adc #$05
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jsr TABV
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jsr space
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ldx index
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lda type_table,x ; folder?
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bmi :+ ; nope
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lda #HI('/') ; yes - suffix with '/'
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jsr Cout
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: jsr SetNamePtrAndLen
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: iny
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lda (name_ptr),y
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jsr Cout
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cpy name_len
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bcc :-
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space: lda #HI(' ')
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jmp Cout
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.endproc
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;;; ============================================================
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.proc AssignRefNum
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lda open_ref_num
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sta read_ref_num
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sta get_eof_ref_num ; also set_mark_position
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rts
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.endproc
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;;; ============================================================
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default_devnum:
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.byte 0
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;;; ============================================================
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;;; Messages
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;;; ============================================================
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message_table:
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msg_select_drive := * - message_table
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scrcode "TAB: SELECT DRIVE\r"
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.byte 0
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msg_select_file := * - message_table
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scrcode "RETURN: SELECT FILE\r\r"
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.byte 0
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;;; ============================================================
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;;; Parameter Blocks
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;;; ============================================================
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;;; OPEN params
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open_params:
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.byte 3
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open_pathname:
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.addr PREFIX
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open_io_buffer:
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.addr $1800
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open_ref_num:
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.byte 0
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;;; CLOSE params
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close_params:
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.byte 1
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.byte 0
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;;; ON_LINE params
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on_line_params:
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.byte $02
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on_line_unit_num:
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.byte $60
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on_line_buffer:
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.addr PREFIX+1
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;;; READ params
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read_params:
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.byte 4
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read_ref_num:
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.byte 0
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read_data_buffer:
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.addr $2000
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read_request_count:
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.word 0
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read_transfer_count:
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.word 0
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;;; SET_PREFIX params
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set_prefix_params:
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.byte 1
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.addr PREFIX
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;;; GET_EOF params
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;;; SET_MARK params
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get_eof_params:
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set_mark_params:
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.byte 2
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get_eof_ref_num:
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set_mark_ref_num:
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.byte 0
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get_eof_eof:
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set_mark_position:
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.faraddr $A0A0A0
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;;; ------------------------------------------------------------
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.endproc
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.assert .sizeof(bbb) - bbb <= $300, error, "Must fit in $300 bytes"
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install_size = $300
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poporg
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;;; ************************************************************
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.include "../inc/driver_postamble.inc"
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;;; ************************************************************
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