Scrolling is now a 16 bit integer.
This commit is contained in:
Rob Greene
parent
b21be649e0
commit
d22bcd1e5a
191
afscanner.s
191
afscanner.s
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@ -66,9 +66,9 @@ DATA DA 0 ; data buffer
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_init da 0 ; current page init
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_display da 0 ; current page line display handler
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_keypress da 0 ; current page keypress handler
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curline dfb 0 ; current first line
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endline dfb 0 ; end of page = min(curline+20,maxlines)
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maxlines dfb 0 ; maximum number of lines availalable
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topline dw 0 ; current line at top of page
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maxlines dw 0 ; maximum number of lines availalable
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printline dw 0 ; line being printed
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DEND
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inbuf = $200 ; reusable buffer
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@ -77,6 +77,8 @@ DATASTART = $4000
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DATAEND = $6000
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DATALEN = DATAEND-DATASTART
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PAGELEN = 20 ; number of lines displayed in content window
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* High ASCII constants
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CTRLH = "H"-$40
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@ -155,40 +157,42 @@ SetupPage
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dfb $00
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ldx #_init ; vector offset
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jsr _VCALL
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sta maxlines
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stz curline
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sty maxlines
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sta maxlines+1
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stz topline
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stz topline+1
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DrawPage
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jsr PRINT ; Clear and then draw the content area
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dfb _HOME,$8d,$8d,0
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lda #0
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:loop pha
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clc
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lda curline
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adc #20
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sta endline
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adc topline
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sta printline
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lda topline+1
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adc #0
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sta printline+1
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cmp maxlines+1
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blt :drwlin
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lda printline
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cmp maxlines
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bcc :start
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lda maxlines ; maxlines < endline, use maxlines
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sta endline
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:start lda curline
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:next pha
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ldx #_display ; vector offset
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bge :erase
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:drwlin lda printline+1
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ldy printline
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ldx #_display
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jsr _VCALL
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pla
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inc
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cmp endline
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bcc :next
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; Clear rest of screen
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:wipe cmp #20
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bcs KeyboardWait
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pha
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jsr PRINT
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bra :incr
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:erase jsr PRINT
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dfb _CLREOL,$8D,0
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pla
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:incr pla
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inc
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bne :wipe
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cmp #PAGELEN
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blt :loop
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KeyboardWait
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lda KEYBOARD
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@ -244,20 +248,53 @@ KeyboardWait
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jmp DrawPage
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; "Local" subroutines
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:down1 lda curline
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inc
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sta curline
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clc
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adc #20
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; if topline+PAGELEN >= maxlines then return
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; topline = topline + 1
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:down1 clc
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lda topline
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adc #PAGELEN
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sta printline
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lda printline+1
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adc #0
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sta printline+1
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cmp maxlines+1
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bcc :minus1
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lda printline
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cmp maxlines
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bcc :rts
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; went too far
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:up1 lda curline
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dec
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bmi :rts
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sta curline
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bge :rts
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:minus1 inc topline
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bne :rts
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inc topline+1
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rts
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; if topline = 0 then return
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; topline = topline - 1
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:up1 lda topline
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ora topline+1
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beq :rts ; already = 0
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sec
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lda topline
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sbc #1
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sta topline
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lda topline+1
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sbc #0
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sta topline+1
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:rts rts
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;:down1 lda curline
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; inc
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; sta curline
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; clc
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; adc #20
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; cmp maxlines
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; bcc :rts
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; ; went too far
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;:up1 lda curline
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; dec
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; bmi :rts
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; sta curline
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;:rts rts
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:pgKey ldx #_keypress
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; Fall through and JMP to _keypress which takes control for local page keys
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@ -292,9 +329,20 @@ SetScreen
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clc
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rts
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*
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* Data per page: Apple ASCII, Initialization, Display, Keypress (7 bytes)
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* Note: Initialization should also display 24th line for the page.
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* Cursor is there and line is clear.
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*
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* Definitions:
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* - BYTE = Character to match on, case insensitive
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* - ADDR = Initialize routine. Returns with A:Y for number of lines.
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* Note: Initialization should also display 24th line for the page.
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* (Cursor is there and line is clear.)
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* - ADDR = Display routine. Called with A:Y for line number. Should end with $8D and is
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* responsible for clearing the line.
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* - ADDR = Keypress handler. NOT A SUBROUTINE. This routine has a number of entry
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* points it might call. KeyboardWait for another keypress or SetupPage to
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* reinitialize and redraw.
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*
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:data
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dfb "A"
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da AboutInit, AboutDisplay, AboutKeypress
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@ -302,6 +350,8 @@ SetScreen
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da FieldInit, FieldDisplay, FieldKeypress
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dfb "B"
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da BrowseInit, BrowseDisplay, BrowseKeypress
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dfb "T"
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da TestInit, TestDisplay, TestKeypress
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dfb 0 ; end
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*
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@ -309,7 +359,7 @@ SetScreen
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*
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* Build array of line pointers in INBUF.
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AboutInit ; Returns with Acc = max lines
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AboutInit ; Returns with A:Y = max lines
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jsr PRINT
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asc _INVERSE,_MT_ON,_U_ARROW,_D_ARROW,_MT_OFF,_NORMAL," Scroll / "
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asc _INVERSE,_MT_ON,_O_APPLE,_NORMAL,"-",_INVERSE,_U_ARROW,_D_ARROW,_MT_OFF,_NORMAL," Page"
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@ -319,20 +369,20 @@ AboutInit ; Returns with Acc = max lines
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sta PTR
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lda #>:lines
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sta PTR+1
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ldx #0 ; max lines
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ldy #0 ; buffer offset
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ldy #0 ; max lines
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ldx #0 ; buffer offset
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:save lda PTR
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sta inbuf,y
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lda PTR+1
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iny
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sta inbuf,y
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iny
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sta inbuf,x
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inx
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lda PTR+1
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sta inbuf,x
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inx
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iny
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:loop lda (PTR)
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bne :incr
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txa
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lda #0 ; high byte of max lines; Y = low byte
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rts
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:incr lda (PTR)
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@ -409,8 +459,8 @@ AboutInit ; Returns with Acc = max lines
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asc "-END-",$00
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dfb 0
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AboutDisplay ; Called with Acc = line
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pha
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AboutDisplay ; Called with A:Y = line
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phy ; assuming < 256 lines
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lda #_CLREOL
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jsr COUT
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pla
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@ -430,7 +480,7 @@ AboutKeypress ; Called with Acc = key
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* FIELD Interface
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*
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FieldInit ; Returns with Acc = max lines
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FieldInit ; Returns with A:Y = max lines
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jsr PRINT
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asc _INVERSE,_MT_ON,_U_ARROW,_D_ARROW,_MT_OFF,_NORMAL," Scroll / "
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asc _INVERSE,_MT_ON,_O_APPLE,_NORMAL,"-",_INVERSE,_U_ARROW,_D_ARROW,_MT_OFF,_NORMAL," Page / "
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@ -467,9 +517,12 @@ FieldInit ; Returns with Acc = max lines
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; Calculate # of lines
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txa
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lsr
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tay
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lda #0 ; Assumed < 256 lines
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rts
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FieldDisplay ; Called with Acc = line
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FieldDisplay ; Called with A:Y = line
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tya ; Assuming < 256 lines
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asl
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tay
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lda inbuf,y
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@ -593,14 +646,14 @@ BrowseInit ; Returns with Acc = max lines
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dec TEMP
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bne :scan
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; The number of lines is based on how many bytes we show on screen
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; HOWEVER, we are limited to 255 lines, so we actually skip the last 32 bytes
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lda #$ff
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lda #1 ; A:Y = $100 or 256 lines
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ldy #0
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rts
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BrowseDisplay ; Called with Acc = line
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; Calculate buffer address
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sta DATA
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stz DATA+1
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sta DATA+1
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sty DATA
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ldy #5 ; times 32
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:mult32 asl DATA
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rol DATA+1
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@ -647,6 +700,30 @@ BrowseKeypress ; Called with Acc = key
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jmp FieldKeypress ; identical to Field ... for now at least
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*
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* TEST interface
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*
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TestInit
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lda #>535
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ldy #<535 ; Nice odd number of lines > 256
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rts
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TestDisplay
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phy
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pha
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lda #_CLREOL
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jsr COUT
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pla
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jsr PRHEX
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pla
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jsr PRHEX
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jmp PRCR
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TestKeypress
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jmp KeyboardWait
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*
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* DISK II routines
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*
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