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DeskTop: complete diasm of screen dumper
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Joshua Bell
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commit
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@ -40,9 +40,22 @@ itself. It then (in a convoluted way) loads in the second $200 bytes of
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This code then loads the rest of the file as a sequence of segments,
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moving them to the appropriate destination in aux/banked/main memory.
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There's fourth chunk of code; it's unclear where that ends up or how
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it is invoked, but it appears to handle an OpenApple+ClosedApple+P
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key sequence and invoke slot one code - possibly debugging support?
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There's fourth chunk of code, which expects to live at $280 so it
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can't co-exist with the Invoker; it may be temporary code, as there is
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no sign that it is ever moved into place. It's also unclear how it
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would be hooked in. The routine detects OA+CA+P and prints the DHR
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screen to an ImageWriter II printer attached to Slot 1. (This may have
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been used to produce screenshots during development for manuals.)
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### Invoker
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`invoker.s`
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Loaded at $290-$03EF, this small routine is used to invoke a target,
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e.g. a double-clicked file. System files are loaded/run at $2000,
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binary files at the location specified by their aux type, and BASIC
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files loaded by searching for BASIC.SYSTEM and running it with the
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pathname passed at $2006 (see ProDOS TLM).
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### Initializer
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@ -52,16 +65,6 @@ Loaded at $800-$FFF, this does one-time initialization of the
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DeskTop. It is later overwritten when any desk accessories are
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run.
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### Invoker
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`desktop.s`
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Loaded at $290-$03EF, this small routine is used to invoke a target,
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e.g. a double-clicked file. System files are loaded/run at $2000,
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binary files at the location specified by their aux type, and BASIC
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files loaded by searching for BASIC.SYSTEM and running it with the
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pathname passed at $2006 (see ProDOS TLM).
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### GUI Library "A2D"
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`a2d.s`
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193
desktop/loader.s
193
desktop/loader.s
@ -477,7 +477,7 @@ max_page:
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;;; ==================================================
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;;; Not sure where this could be invoked from
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.proc rest
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.proc dump_screen
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.org $280
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SLOT1 := $C100
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@ -486,6 +486,9 @@ max_page:
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CR := $0D
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ESC := $1B
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hbasl := $6
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screen_width := 560
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;; Test for OpenApple+ClosedApple+P
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pha
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lda BUTN0
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@ -493,12 +496,11 @@ max_page:
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bpl :+
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lda KBD
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cmp #('P' | $80)
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beq L0294
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beq invoke
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: pla
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jmp L7ECA ; ???
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;; Invoked if OA+CA+P is held
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L0294: sta KBDSTRB
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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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@ -507,11 +509,11 @@ L0294: sta KBDSTRB
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sta ALTZPOFF
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sta ROMIN2
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lda #0
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sta L03C5
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jmp L035F
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sta y_row
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jmp print_screen
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.proc send_spacing_sequence
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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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@ -543,66 +545,90 @@ init_graphics:
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.byte ESC,"G0560" ; Graphics, 560 data bytes
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.endproc
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L02E6: jsr send_init_graphics
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ldy #$00
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sty L03CC
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lda #$01
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sta L03C9
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lda #$00
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sta L03C6
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sta L03C7
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L02FB: lda #$08
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sta L03CB
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lda L03C5
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sta L03C8
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L0306: lda L03C8
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jsr L0393
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lda L03CC
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lsr a
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tay
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sta LOWSCR
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bcs L0319
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sta HISCR
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L0319: lda ($06),y
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and L03C9
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cmp #1
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ror L03CA
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inc L03C8
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dec L03CB
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bne L0306
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lda L03CA
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eor #$FF
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sta LOWSCR
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jsr cout
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lda L03C6
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cmp #$2F
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bne L0344
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lda L03C7
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cmp #2
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beq L035B
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L0344: asl L03C9
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bpl L0351
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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 L03C9
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inc L03CC
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L0351: inc L03C6
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bne L02FB
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inc L03C7
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bne L02FB
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L035B: sta LOWSCR
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rts
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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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L035F: jsr pr_num_1
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jsr send_spacing_sequence
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L0365: jsr L02E6
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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 #CR
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jsr cout
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lda #LF
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jsr cout
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lda L03C8
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sta L03C5
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lda y_coord
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sta y_row
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cmp #192 ; screen height in pixels
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bcc L0365
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bcc loop
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;; Finish up
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lda #CR
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jsr cout
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lda #CR
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@ -612,8 +638,11 @@ L0365: jsr L02E6
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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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L0393: pha
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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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@ -621,21 +650,22 @@ L0393: pha
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lsr a
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lsr a
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lsr a
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sta $06
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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 $06
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eor hbasl
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asl a
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rol $07
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rol hbasl+1
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asl a
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rol $07
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eor $06
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sta $06
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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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pr_num_1:
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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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@ -643,19 +673,22 @@ pr_num_1:
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lda #(CR | $80)
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jsr invoke_slot1
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rts
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.endproc
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cout: jsr COUT
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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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L03C5: .byte 0
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L03C6: .byte 0
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L03C7: .byte 0
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L03C8: .byte 0
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L03C9: .byte 0
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L03CA: .byte 0
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L03CB: .byte 0
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L03CC: .byte 0
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.byte $00,$00
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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 ESC,'e' ; 107 DPI (horizontal)
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@ -674,6 +707,6 @@ invoke_slot1:
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;; Padding
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.res $400 - *, 0
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.endproc ; rest
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.endproc ; dump_screen
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.assert .sizeof(install_as_quit) + .sizeof(quit_routine) + .sizeof(install_segments) + .sizeof(rest) = $580, error, "Size mismatch"
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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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