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https://github.com/a2stuff/prodos-drivers.git
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prodos global page, devices
This commit is contained in:
Joshua Bell
parent
1d974dcf34
commit
dd6a4b319e
108
b.s
108
b.s
@ -4,8 +4,6 @@
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.include "apple2.inc"
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.include "prodos.inc"
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L0060 := $0060
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RESETVEC := $3F2
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RAMRDOFF := $C002
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@ -31,7 +29,10 @@ COL80HPOS := $057B
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;;; ProDOS
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BITMAP := $BF58
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BITMAP_SIZE := $18
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BITMAP_SIZE := $18 ; Bits for pages $00 to $BF
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DEVNUM := $BF30 ; Most recent accessed device
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DEVCNT := $BF31 ; Number of on-line devices minus 1
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DEVLST := $BF32 ; Up to 14 units
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;;; ASCII
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ASCII_TAB := $9
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@ -58,6 +59,16 @@ ASCII_ESCAPE := $1B
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.byte 0
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.endmacro
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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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;;; Entry point
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;;; ------------------------------------------------------------
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@ -81,14 +92,24 @@ L2000: jmp install_and_quit
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filenames := $1400 ; each is length + 15 bytes
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read_buffer := $2000 ; Also, start location for launched SYS files
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mark_params := $60
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mark_ref_num := $61
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mark_position := $62 ; 3-bytes
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next_device := $65 ; next device number to try
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current_entry := $67 ; index of current entry
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num_entries := $68 ; length of |filenames|
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curr_len := $69 ; length of current entry name
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curr_ptr := $6C ; address of current entry name (in |filenames|)
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page_start := $73 ; index of first entry shown on screen
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max_entries := 128 ; max # of entries; more are ignored
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types_table := $74 ; high bit clear = dir, set = sys
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top_row := 2 ; first row used on screen
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bottom_row := 21 ; last row used on screen
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@ -108,34 +129,39 @@ L2000: jmp install_and_quit
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;; Update system bitmap
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ldx #BITMAP_SIZE-1 ; zero it all out
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: stz BITMAP,x ; zero it all out...
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: stz BITMAP,x
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dex
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bpl :-
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inc BITMAP+BITMAP_SIZE-1 ; protect global page itself
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inc BITMAP+BITMAP_SIZE-1 ; protect ProDOS global page
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lda #%11001111 ; protect zp, stack, text page 1
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sta BITMAP
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lda #$CF
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sta $BF58
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lda #$02
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sta L0060
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ldx $BF31
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stx $65
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lda $BF30
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;; Find device
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lda #2
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sta $60
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ldx DEVCNT ; max device num
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stx next_device
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lda DEVNUM
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bne L1042
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L1032: ldx $65
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lda $BF32,x
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cpx #$01
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bcs L103F
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ldx $BF31
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check_device:
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ldx next_device
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lda DEVLST,x
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cpx #1
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bcs :+
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ldx DEVCNT
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inx
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L103F: dex
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stx $65
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: dex
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stx next_device
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L1042: sta on_line_params_unit
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MLI_CALL ON_LINE, on_line_params
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bcs L1032
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bcs check_device
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stz $6B
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lda prefix+1
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and #$0F
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beq L1032
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beq check_device
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adc #$02
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tax
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@ -148,7 +174,7 @@ L1059: stx prefix ; truncate prefix to length x
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MLI_CALL OPEN, open_params
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bcc L107F
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lda $6B
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beq L1032
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beq check_device
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jsr BELL1
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jsr L11DA
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stx prefix
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@ -158,7 +184,7 @@ L107F: inc $6B ; ???
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stz num_entries
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lda open_params_ref_num
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sta read_params_ref_num
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sta $61
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sta mark_ref_num
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lda #$2B
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sta read_params_request
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stz read_params_request+1
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@ -172,25 +198,25 @@ L109A: lda $2023,x
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sta read_params_request
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lda #$01
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sta $72
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stz $63
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stz $64
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stz mark_position+1
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stz mark_position+2
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lda $70
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ora $71
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bne L10B5
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L10B3: bra finish_read
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L10B5: bit $71
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bmi L10B3
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L10B9: lda $63
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L10B9: lda mark_position+1
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and #$FE
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sta $63
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sta mark_position+1
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ldy $72
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lda #$00
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cpy $6F
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bcc L10CE
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tay
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sty $72
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inc $63
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L10CC: inc $63
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inc mark+position+1
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L10CC: inc mark_position+1
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L10CE: dey
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clc
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bmi L10D8
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@ -198,8 +224,8 @@ L10CE: dey
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bcc L10CE
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bcs L10CC
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L10D8: adc #$04
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sta $62
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MLI_CALL SET_MARK, L0060
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sta mark_position
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MLI_CALL SET_MARK, mark_params
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bcs L10B3
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jsr do_read
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bcs L10B3
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@ -218,9 +244,9 @@ L10F8: ror $201E
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cmp #$FF
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bne L10B5
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L1108: ldx num_entries
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cpx #$80
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cpx #max_entries
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bcs finish_read
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sta $74,x
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sta types_table,x
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jsr update_curr_ptr
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ldy #$0F
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L1115: lda read_buffer,y
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@ -232,7 +258,7 @@ L1115: lda read_buffer,y
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sta (curr_ptr),y
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inc num_entries
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bne L10B5
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L1126: jmp L1032
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L1126: jmp check_device
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finish_read:
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MLI_CALL CLOSE, close_params
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@ -370,7 +396,7 @@ L11DD: dex
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L11EC: rts
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next_drive:
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jmp L1032
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jmp check_device
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L11F0: inx
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L11F1: jmp L1059
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@ -393,7 +419,7 @@ L11F1: jmp L1059
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stx prefix
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ldy current_entry
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lda $74,y
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lda types_table,y
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bpl L11F0 ; is directory???
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;; nope, system file, so...
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@ -478,8 +504,10 @@ draw_current_line:
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inc a
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jsr MON_TABV
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lda $74,x
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bmi L1299
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lda types_table,x
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bmi name ; is sys file?
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;; Draw folder glyph
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stz COL80HPOS
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lda INVFLG
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pha
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@ -487,7 +515,9 @@ draw_current_line:
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jsr cout_string
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pla
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sta INVFLG
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L1299: jsr space
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;; Draw the name
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name: jsr space
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jsr update_curr_ptr
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L129F: iny
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lda (curr_ptr),y
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