NEW
  AUTO 3,1
*--------------------------------

D.YSAVE          .EQ VAR.BEG-1
D.CHR.UNDER.CURS .EQ D.YSAVE-1
 
*--------------------------------
* APPLE IIE VIDEO JUMP VECTORS
*  1. READ KEYBOARD KEY CODE
*       TURNS ON CURSOR
*       GETS KEY CODE
*       TURNS OFF CURSOR
*       REG-A HAS KEY CODE SIGN BIT ON.
*  2. HORIZONTAL TAB
*       REG-A HAS TAB 0-79
*  3. VERTICAL TAB
*       REG-A HAS TAB 0-23
*  4. CLEAR TO END OF LINE
*  5. CLEAR TO END OF SCREEN
*  6. CHARACTER OUTPUT ROUTINE
*       REG-A HAS CHAR TO OUTPUT.
*       MUST NOT SCROLL SCREEN OR
*       GO TO NEXT LINE WHEN LAST
*       CHARACTER IS PRINTED ON A LINE.
*--------------------------------
 
       JMP D.RD.KBD
*      JMP D.MY.HTAB
D.MY.HTAB
 
       STA CH       set tab value
       RTS
 
       JMP D.MY.VTAB
       JMP D.MY.CLREOL
       JMP D.MY.CLREOP
*      JMP D.MY.COUT
 
*--------------------------------
 
D.MY.COUT
 
       STY D.YSAVE
       PHA          SAVE ORIG CHAR
       CMP #$A0     CONVERT CNTRL CHARS TO INVERSE ALPHA
       BCS .1       REG CHAR
       AND #$7F     CNTRL CHAR
* dcj *ORA #$40     makes mousetext!!!
 
.1     PHA          store in-line to speed it up some
       STA D.SET80COL
       STA D.SET80VID
       STA D.SETALTCHR
       LDA CH
       LSR
       TAY
       PLA
       PHP
       SEI
       BIT D.TXTPAGE2
       BCC .2
       BIT D.TXTPAGE1
 
.2     STA (BASEL),Y
       BIT D.TXTPAGE1
       PLP
       INC CH
       PLA          RESTORE ORIG CHAR
       LDY D.YSAVE
 
D.SEV  RTS
 
*--------------------------------
 
D.MY.CLP
 
       LDA CTR
       JSR D.MY.VTAB
 
D.MY.CLREOP
 
       JSR D.MY.CLREOL   ZAP REST OF LINE
       LDA #0
       JSR D.MY.HTAB     NEXT LINE ZAPPED FROM COL 0
       INC CTR           BUMP COUNT TO NEXT LINE
       LDA CTR
       CMP LAST.LINE     END OF PAGE?
       BCC D.MY.CLP      < END
       BEQ D.MY.CLP      = END
       RTS               > END
 
*--------------------------------
 
D.MY.VTAB STA CV         SET TAB VALUE
       JMP M.BASCALC     COMPUTE NEW COUT BASE ADRS
 
*--------------------------------
 
D.RD80VID   .EQ $C01F
D.TXTPAGE2  .EQ $C055
D.TXTPAGE1  .EQ $C054
D.SET80COL  .EQ $C001
D.SET80VID  .EQ $C00D
D.SETALTCHR .EQ $C00F

D.PICK CLV

D.SCREENIT
 
       PHA
       STA D.SET80COL    ENABLE 80 COL STORE
       STA D.SET80VID    ENABLE 80 COL DISPLAY
       STA D.SETALTCHR   ENABLE LOWER CASE
       LDA CH
       LSR               CH MOD 2 FOR PAGE SELECT
       TAY               CH/2 FOR INDEX
       BVS .20           GO STORE
* 80 COL PICK
       PHP
       SEI
       LDA D.TXTPAGE2
       BCC .10
       LDA D.TXTPAGE1
 
.10    LDA (BASEL),Y     GET 80 COL CHAR
       TAY
       LDA D.TXTPAGE1
       PLP
       PLA
       TYA
       PHA
       BVC .30           EXIT ALWAYS
* 80 COL STORE
 
.20    PLA
       PHA
       PHP
       SEI
       PHA
       LDA D.TXTPAGE2
       BCC .21
       LDA D.TXTPAGE1
 
.21    PLA
       STA (BASEL),Y     PUT 80 COL CHAR
       LDA D.TXTPAGE1
       PLP
 
* COMMON EXIT
 
.30    PLA
       RTS
 
*--------------------------------
 
D.MY.CLREOL
 
       LDY CH
 
.1     LDA #$A0          A-REG = BLANK
       CPY SCREEN.WIDTH
       BCS .2
       JSR D.MY.COUT     OUTPUT BLANKS UNTIL SCREEN WIDTH
       LDY CH
       BNE .1            ...ALWAYS
 
.2     RTS
 
*--------------------------------
 
D.RD.KBD
 
       JSR D.POSN        SETUP CURSOR POSN
       LDA ESC.FLAG      SEE IF EDIT MODE
       BNE .20           YES IT IS
* CURSOR MODE - CURSOR IS INVERSE "+"
       JSR D.PICK
       STA D.CHR.UNDER.CURS
       AND #$80          SAVE INV BIT
       EOR #$80+'+       FLIP IT FOR + CURSOR
       BIT D.SEV
       JSR D.SCREENIT
 
.10    LDA $C000
       BPL .10
 
.11    BIT $C010
       PHA
       LDA D.CHR.UNDER.CURS
       BIT D.SEV
       JSR D.SCREENIT
       PLA
       RTS
 
* EDIT MODE - CURSOR IS BLINKING CURRENT CHAR
*      BLINKED WITH SOFTWARE TIMING LOOP.
 
.20    JSR D.PICK
       STA D.CHR.UNDER.CURS
 
.21    JSR D.PICK        TOGGLE INV FLAG
       EOR #$80
       cmp #$40
       bcc .99
       cmp #$60
       bcs .99
       and #$1F
 
.99    BIT D.SEV
       JSR D.SCREENIT
       LDY #200          LOOP 200 TIMES BEFORE FLIPPING CHAR
 
.22    LDA $C000
       BMI .11
       LDA #00
 
.23    SEC               COUNT 7*256 MICRO SECS
       SBC #1
       BNE .23
       DEY
       BEQ .21           END LOOP - FLIP CHAR
       BNE .22      BA   CK KEY AGAIN
 
*--------------------------------
 
D.POSN LDA POSV
       JSR D.MY.VTAB     POSITION VERTICALLY
       LDA POSH
       SEC
       SBC LEFT.MARGIN
       CLC
       ADC RM.ADJUST
       JMP D.MY.HTAB     POSITION HORIZONTALLY
 
*--------------------------------
MAN
SAVE usr/src/fse/fse.s.a2e
LOAD usr/src/fse/fse.s
ASM