mirror of https://github.com/mist64/msbasic.git
886 lines
18 KiB
ArmAsm
886 lines
18 KiB
ArmAsm
.segment "CODE"
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MEMERR:
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ldx #ERR_MEMFULL
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; ----------------------------------------------------------------------------
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; HANDLE AN ERROR
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;
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; (X)=OFFSET IN ERROR MESSAGE TABLE
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; (ERRFLG) > 128 IF "ON ERR" TURNED ON
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; (CURLIN+1) = $FF IF IN DIRECT MODE
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; ----------------------------------------------------------------------------
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ERROR:
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lsr Z14
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.ifdef CONFIG_CBM_ALL
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lda Z03 ; output
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beq LC366 ; is screen
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jsr CLRCH ; otherwise redirect output back to screen
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lda #$00
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sta Z03
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LC366:
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.endif
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jsr CRDO
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jsr OUTQUES
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L2329:
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lda ERROR_MESSAGES,x
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.ifndef CONFIG_SMALL
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pha
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and #$7F
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.endif
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jsr OUTDO
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.ifdef CONFIG_SMALL
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lda ERROR_MESSAGES+1,x
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.ifdef KBD
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and #$7F
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.endif
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jsr OUTDO
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.else
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inx
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pla
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bpl L2329
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.endif
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jsr STKINI
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lda #<QT_ERROR
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ldy #>QT_ERROR
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; ----------------------------------------------------------------------------
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; PRINT STRING AT (Y,A)
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; PRINT CURRENT LINE # UNLESS IN DIRECT MODE
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; FALL INTO WARM RESTART
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; ----------------------------------------------------------------------------
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PRINT_ERROR_LINNUM:
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jsr STROUT
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ldy CURLIN+1
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iny
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beq RESTART
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jsr INPRT
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; ----------------------------------------------------------------------------
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; WARM RESTART ENTRY
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; ----------------------------------------------------------------------------
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RESTART:
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.ifdef KBD
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jsr CRDO
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nop
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L2351X:
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jsr OKPRT
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L2351:
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jsr LFDDA
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LE28E:
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bpl RESTART
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.else
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lsr Z14
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lda #<QT_OK
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ldy #>QT_OK
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.ifdef CONFIG_CBM_ALL
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jsr STROUT
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.else
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jsr GOWARM
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.endif
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L2351:
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jsr INLIN
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.endif
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stx TXTPTR
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sty TXTPTR+1
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jsr CHRGET
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.ifdef CONFIG_11
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tax
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.endif
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.ifdef KBD
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beq L2351X
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.else
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beq L2351
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.endif
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ldx #$FF
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stx CURLIN+1
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bcc NUMBERED_LINE
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jsr PARSE_INPUT_LINE
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jmp NEWSTT2
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; ----------------------------------------------------------------------------
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; HANDLE NUMBERED LINE
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; ----------------------------------------------------------------------------
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NUMBERED_LINE:
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jsr LINGET
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jsr PARSE_INPUT_LINE
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sty EOLPNTR
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.ifdef KBD
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jsr LFD3E
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lda JMPADRS+1
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sta LOWTR
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sta $96
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lda JMPADRS+2
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sta LOWTR+1
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sta $97
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lda $13
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sta $06FE
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lda $14
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sta $06FF
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inc $13
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bne LE2D2
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inc $14
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bne LE2D2
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jmp SYNERR
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LE2D2:
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jsr LF457
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ldx #$96
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jsr LE4D4
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bcs LE2FD
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LE2DC:
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ldx #$00
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lda (JMPADRS+1,x)
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sta ($96,x)
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inc JMPADRS+1
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bne LE2E8
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inc JMPADRS+2
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LE2E8:
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inc $96
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bne LE2EE
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inc $97
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LE2EE:
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ldx #$2B
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jsr LE4D4
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bne LE2DC
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lda $96
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sta VARTAB
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lda $97
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sta VARTAB+1
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LE2FD:
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jsr SETPTRS
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jsr LE33D
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lda Z00
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LE306:
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beq LE28E
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cmp #$A5
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beq LE306
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clc
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.else
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jsr FNDLIN
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bcc PUT_NEW_LINE
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ldy #$01
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lda (LOWTR),y
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sta INDEX+1
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lda VARTAB
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sta INDEX
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lda LOWTR+1
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sta DEST+1
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lda LOWTR
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dey
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sbc (LOWTR),y
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clc
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adc VARTAB
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sta VARTAB
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sta DEST
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lda VARTAB+1
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adc #$FF
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sta VARTAB+1
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sbc LOWTR+1
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tax
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sec
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lda LOWTR
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sbc VARTAB
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tay
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bcs L23A5
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inx
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dec DEST+1
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L23A5:
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clc
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adc INDEX
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bcc L23AD
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dec INDEX+1
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clc
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L23AD:
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lda (INDEX),y
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sta (DEST),y
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iny
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bne L23AD
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inc INDEX+1
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inc DEST+1
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dex
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bne L23AD
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.endif
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; ----------------------------------------------------------------------------
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PUT_NEW_LINE:
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.ifdef CBM2
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jsr SETPTRS
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jsr LE33D
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lda INPUTBUFFER
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beq L2351
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clc
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.else
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.ifndef KBD
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lda INPUTBUFFER
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beq FIX_LINKS
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lda MEMSIZ
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ldy MEMSIZ+1
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sta FRETOP
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sty FRETOP+1
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.endif
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.endif
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lda VARTAB
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sta HIGHTR
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adc EOLPNTR
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sta HIGHDS
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ldy VARTAB+1
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sty HIGHTR+1
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bcc L23D6
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iny
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L23D6:
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sty HIGHDS+1
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jsr BLTU
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.ifdef CBM2_APPLE
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lda LINNUM
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ldy LINNUM+1
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sta INPUTBUFFER-2
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sty INPUTBUFFER-1
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.endif
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lda STREND
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ldy STREND+1
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sta VARTAB
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sty VARTAB+1
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ldy EOLPNTR
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dey
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; ---COPY LINE INTO PROGRAM-------
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L23E6:
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lda INPUTBUFFER-4,y
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sta (LOWTR),y
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dey
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bpl L23E6
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; ----------------------------------------------------------------------------
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; CLEAR ALL VARIABLES
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; RE-ESTABLISH ALL FORWARD LINKS
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; ----------------------------------------------------------------------------
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FIX_LINKS:
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jsr SETPTRS
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.ifdef CBM2_KBD
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jsr LE33D
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jmp L2351
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LE33D:
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.endif
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lda TXTTAB
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ldy TXTTAB+1
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sta INDEX
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sty INDEX+1
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clc
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L23FA:
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ldy #$01
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lda (INDEX),y
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.ifdef CBM2_KBD
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beq RET3
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.else
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bne L2403
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jmp L2351
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.endif
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L2403:
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ldy #$04
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L2405:
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iny
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lda (INDEX),y
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bne L2405
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iny
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tya
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adc INDEX
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tax
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ldy #$00
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sta (INDEX),y
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lda INDEX+1
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adc #$00
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iny
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sta (INDEX),y
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stx INDEX
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sta INDEX+1
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bcc L23FA
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.ifdef KBD
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SLOD:
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ldx #$01
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.byte $2C
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PLOD:
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ldx #$00
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ldy CURLIN+1
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iny
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sty JMPADRS
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jsr LFFD3
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jsr LF422
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ldx #$02
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jsr LFF64
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ldx #$6F
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ldy #$00
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jsr LE39A
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jsr LE33D
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jmp CLEARC
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.byte $FF
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.byte $FF
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.byte $FF
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VER:
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lda #$13
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ldx FAC
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beq LE397
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lda $DFF9
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LE397:
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jmp FLOAT
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LE39A:
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lda VARTAB,x
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clc
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adc $051B,y
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sta VARTAB,y
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lda VARTAB+1,x
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adc $051C,y
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sta VARTAB+1,y
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RET3:
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rts
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.else
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; ----------------------------------------------------------------------------
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; READ A LINE, AND STRIP OFF SIGN BITS
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; ----------------------------------------------------------------------------
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.ifdef APPLE
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INLIN:
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ldx #$DD
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INLIN1:
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stx $33
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jsr L2900
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cpx #$EF
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bcs L0C32
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ldx #$EF
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L0C32:
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lda #$00
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sta INPUTBUFFER,x
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ldx #<INPUTBUFFER-1
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ldy #>INPUTBUFFER-1
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rts
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RDKEY:
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jsr LFD0C
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and #$7F
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.else
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.ifdef CBM2
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RET3:
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rts
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.else
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L2420:
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.ifdef OSI
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jsr OUTDO
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.endif
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dex
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bpl INLIN2
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L2423:
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.ifdef OSI
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jsr OUTDO
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.endif
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jsr CRDO
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.endif
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INLIN:
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ldx #$00
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INLIN2:
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jsr GETLN
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.ifndef CONFIG_CBM_ALL
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cmp #$07
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beq L2443
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.endif
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cmp #$0D
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beq L2453
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.ifndef CONFIG_CBM_ALL
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cmp #$20 ; line editing
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bcc INLIN2
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cmp #$7D
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bcs INLIN2
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cmp #$40 ; @
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beq L2423
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cmp #$5F ; _
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beq L2420
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L2443:
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cpx #$47
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bcs L244C
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.endif
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sta INPUTBUFFER,x
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inx
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.ifdef OSI
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.byte $2C
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.else
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bne INLIN2
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.endif
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L244C:
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.ifndef CONFIG_CBM_ALL
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lda #$07
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jsr OUTDO
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bne INLIN2
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.endif
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L2453:
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jmp L29B9
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GETLN:
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.ifdef CONFIG_CBM_ALL
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jsr CHRIN
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ldy Z03
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bne L2465
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.else
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jsr MONRDKEY
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.endif
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.ifdef OSI
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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and #$7F
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.endif
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.endif
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cmp #$0F
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bne L2465
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pha
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lda Z14
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eor #$FF
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sta Z14
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pla
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L2465:
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rts
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.endif /* KBD */
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; ----------------------------------------------------------------------------
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; TOKENIZE THE INPUT LINE
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; ----------------------------------------------------------------------------
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PARSE_INPUT_LINE:
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ldx TXTPTR
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ldy #$04
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sty DATAFLG
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L246C:
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lda INPUTBUFFERX,x
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.ifdef CONFIG_CBM_ALL
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bpl LC49E
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cmp #$FF
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beq L24AC
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inx
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bne L246C
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LC49E:
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.endif
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cmp #$20
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beq L24AC
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sta ENDCHR
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cmp #$22
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beq L24D0
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bit DATAFLG
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bvs L24AC
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cmp #$3F
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bne L2484
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lda #TOKEN_PRINT
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bne L24AC
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L2484:
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cmp #$30
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bcc L248C
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cmp #$3C
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bcc L24AC
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; ----------------------------------------------------------------------------
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; SEARCH TOKEN NAME TABLE FOR MATCH STARTING
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; WITH CURRENT CHAR FROM INPUT LINE
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; ----------------------------------------------------------------------------
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L248C:
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sty STRNG2
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ldy #$00
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sty EOLPNTR
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dey
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stx TXTPTR
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dex
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L2496:
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iny
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L2497:
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inx
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L2498:
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.ifdef KBD
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jsr LF42D
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.else
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lda INPUTBUFFERX,x
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.ifndef CBM2
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cmp #$20
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beq L2497
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.endif
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.endif
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sec
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sbc TOKEN_NAME_TABLE,y
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beq L2496
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cmp #$80
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bne L24D7
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ora EOLPNTR
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; ----------------------------------------------------------------------------
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; STORE CHARACTER OR TOKEN IN OUTPUT LINE
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; ----------------------------------------------------------------------------
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L24AA:
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ldy STRNG2
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L24AC:
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inx
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iny
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sta INPUTBUFFER-5,y
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lda INPUTBUFFER-5,y
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beq L24EA
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sec
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sbc #$3A
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beq L24BF
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cmp #$49
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bne L24C1
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L24BF:
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sta DATAFLG
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L24C1:
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sec
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sbc #TOKEN_REM-':'
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bne L246C
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sta ENDCHR
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; ----------------------------------------------------------------------------
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; HANDLE LITERAL (BETWEEN QUOTES) OR REMARK,
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; BY COPYING CHARS UP TO ENDCHR.
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; ----------------------------------------------------------------------------
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L24C8:
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lda INPUTBUFFERX,x
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beq L24AC
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cmp ENDCHR
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beq L24AC
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L24D0:
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iny
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sta INPUTBUFFER-5,y
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inx
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bne L24C8
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; ----------------------------------------------------------------------------
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; ADVANCE POINTER TO NEXT TOKEN NAME
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; ----------------------------------------------------------------------------
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L24D7:
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ldx TXTPTR
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inc EOLPNTR
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L24DB:
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iny
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lda MATHTBL+28+1,y
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bpl L24DB
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lda TOKEN_NAME_TABLE,y
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bne L2498
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lda INPUTBUFFERX,x
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bpl L24AA
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; ---END OF LINE------------------
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L24EA:
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sta INPUTBUFFER-3,y
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.if INPUTBUFFER >= $0100
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dec TXTPTR+1
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.endif
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lda #<INPUTBUFFER-1
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sta TXTPTR
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rts
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; ----------------------------------------------------------------------------
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; SEARCH FOR LINE
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;
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; (LINNUM) = LINE # TO FIND
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; IF NOT FOUND: CARRY = 0
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; LOWTR POINTS AT NEXT LINE
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; IF FOUND: CARRY = 1
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; LOWTR POINTS AT LINE
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; ----------------------------------------------------------------------------
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FNDLIN:
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.ifdef KBD
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jsr CHRGET
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jmp LE444
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LE440:
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php
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jsr LINGET
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LE444:
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jsr LF457
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ldx #$FF
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plp
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beq LE464
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jsr CHRGOT
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beq L2520
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cmp #$A5
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bne L2520
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jsr CHRGET
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beq LE464
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bcs LE461
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jsr LINGET
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beq L2520
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LE461:
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jmp SYNERR
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LE464:
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stx $13
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stx $14
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.else
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lda TXTTAB
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ldx TXTTAB+1
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FL1:
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ldy #$01
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sta LOWTR
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stx LOWTR+1
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lda (LOWTR),y
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beq L251F
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iny
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iny
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lda LINNUM+1
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cmp (LOWTR),y
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bcc L2520
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beq L250D
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dey
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bne L2516
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L250D:
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lda LINNUM
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dey
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cmp (LOWTR),y
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bcc L2520
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beq L2520
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L2516:
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dey
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lda (LOWTR),y
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tax
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dey
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lda (LOWTR),y
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bcs FL1
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L251F:
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clc
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.endif
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L2520:
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rts
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; ----------------------------------------------------------------------------
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; "NEW" STATEMENT
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; ----------------------------------------------------------------------------
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NEW:
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bne L2520
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SCRTCH:
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lda #$00
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tay
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|
sta (TXTTAB),y
|
|
iny
|
|
sta (TXTTAB),y
|
|
lda TXTTAB
|
|
.ifdef CBM2_KBD
|
|
clc
|
|
.endif
|
|
adc #$02
|
|
sta VARTAB
|
|
lda TXTTAB+1
|
|
adc #$00
|
|
sta VARTAB+1
|
|
; ----------------------------------------------------------------------------
|
|
SETPTRS:
|
|
jsr STXTPT
|
|
.ifndef APPLE
|
|
.ifdef CONFIG_11
|
|
lda #$00
|
|
|
|
; ----------------------------------------------------------------------------
|
|
; "CLEAR" STATEMENT
|
|
; ----------------------------------------------------------------------------
|
|
CLEAR:
|
|
bne L256A
|
|
.endif
|
|
.endif
|
|
CLEARC:
|
|
.ifdef KBD
|
|
lda #<CONST_MEMSIZ
|
|
ldy #>CONST_MEMSIZ
|
|
.else
|
|
lda MEMSIZ
|
|
ldy MEMSIZ+1
|
|
.endif
|
|
sta FRETOP
|
|
sty FRETOP+1
|
|
.ifdef CONFIG_CBM_ALL
|
|
jsr CLALL
|
|
.endif
|
|
lda VARTAB
|
|
ldy VARTAB+1
|
|
sta ARYTAB
|
|
sty ARYTAB+1
|
|
sta STREND
|
|
sty STREND+1
|
|
jsr RESTORE
|
|
; ----------------------------------------------------------------------------
|
|
STKINI:
|
|
ldx #TEMPST
|
|
stx TEMPPT
|
|
pla
|
|
.ifdef CBM2_KBD
|
|
tay
|
|
.else
|
|
.ifdef APPLE
|
|
sta STACK+249
|
|
.else
|
|
sta STACK+253
|
|
.endif
|
|
.endif
|
|
pla
|
|
.ifndef CBM2_KBD
|
|
.ifdef APPLE
|
|
sta STACK+250
|
|
.else
|
|
sta STACK+254
|
|
.endif
|
|
.endif
|
|
ldx #STACK_TOP
|
|
txs
|
|
.ifdef CBM2_KBD
|
|
pha
|
|
tya
|
|
pha
|
|
.endif
|
|
lda #$00
|
|
sta OLDTEXT+1
|
|
sta SUBFLG
|
|
L256A:
|
|
rts
|
|
|
|
; ----------------------------------------------------------------------------
|
|
; SET TXTPTR TO BEGINNING OF PROGRAM
|
|
; ----------------------------------------------------------------------------
|
|
STXTPT:
|
|
clc
|
|
lda TXTTAB
|
|
adc #$FF
|
|
sta TXTPTR
|
|
lda TXTTAB+1
|
|
adc #$FF
|
|
sta TXTPTR+1
|
|
rts
|
|
.ifdef KBD
|
|
LE4C0:
|
|
ldy #<LE444
|
|
ldx #>LE444
|
|
LE4C4:
|
|
jsr LFFD6
|
|
jsr LFFED
|
|
lda $0504
|
|
clc
|
|
adc #$08
|
|
sta $0504
|
|
rts
|
|
LE4D4:
|
|
lda $01,x
|
|
cmp JMPADRS+2
|
|
bne LE4DE
|
|
lda $00,x
|
|
cmp JMPADRS+1
|
|
LE4DE:
|
|
rts
|
|
|
|
; ----------------------------------------------------------------------------
|
|
; "LIST" STATEMENT
|
|
; ----------------------------------------------------------------------------
|
|
LIST:
|
|
jsr LE440
|
|
bne LE4DE
|
|
pla
|
|
pla
|
|
L25A6:
|
|
jsr CRDO
|
|
.else
|
|
LIST:
|
|
bcc L2581
|
|
beq L2581
|
|
cmp #TOKEN_MINUS
|
|
bne L256A
|
|
L2581:
|
|
jsr LINGET
|
|
jsr FNDLIN
|
|
jsr CHRGOT
|
|
beq L2598
|
|
cmp #TOKEN_MINUS
|
|
bne L2520
|
|
jsr CHRGET
|
|
jsr LINGET
|
|
bne L2520
|
|
L2598:
|
|
pla
|
|
pla
|
|
lda LINNUM
|
|
ora LINNUM+1
|
|
bne L25A6
|
|
lda #$FF
|
|
sta LINNUM
|
|
sta LINNUM+1
|
|
L25A6:
|
|
.endif
|
|
ldy #$01
|
|
.ifdef CONFIG_DATAFLAG
|
|
sty DATAFLG
|
|
.endif
|
|
lda (LOWTRX),y
|
|
beq L25E5
|
|
jsr ISCNTC
|
|
.ifndef KBD
|
|
jsr CRDO
|
|
.endif
|
|
iny
|
|
lda (LOWTRX),y
|
|
tax
|
|
iny
|
|
lda (LOWTRX),y
|
|
cmp LINNUM+1
|
|
bne L25C1
|
|
cpx LINNUM
|
|
beq L25C3
|
|
L25C1:
|
|
bcs L25E5
|
|
; ---LIST ONE LINE----------------
|
|
L25C3:
|
|
sty FORPNT
|
|
jsr LINPRT
|
|
lda #$20
|
|
L25CA:
|
|
ldy FORPNT
|
|
and #$7F
|
|
L25CE:
|
|
jsr OUTDO
|
|
.ifdef CONFIG_DATAFLAG
|
|
cmp #$22
|
|
bne LA519
|
|
lda DATAFLG
|
|
eor #$FF
|
|
sta DATAFLG
|
|
LA519:
|
|
.endif
|
|
iny
|
|
.ifdef CONFIG_11
|
|
beq L25E5
|
|
.endif
|
|
lda (LOWTRX),y
|
|
bne L25E8
|
|
tay
|
|
lda (LOWTRX),y
|
|
tax
|
|
iny
|
|
lda (LOWTRX),y
|
|
stx LOWTRX
|
|
sta LOWTRX+1
|
|
bne L25A6
|
|
L25E5:
|
|
jmp RESTART
|
|
L25E8:
|
|
bpl L25CE
|
|
.ifdef CONFIG_DATAFLAG
|
|
cmp #$FF
|
|
beq L25CE
|
|
bit DATAFLG
|
|
bmi L25CE
|
|
.endif
|
|
sec
|
|
sbc #$7F
|
|
tax
|
|
sty FORPNT
|
|
ldy #$FF
|
|
L25F2:
|
|
dex
|
|
beq L25FD
|
|
L25F5:
|
|
iny
|
|
lda TOKEN_NAME_TABLE,y
|
|
bpl L25F5
|
|
bmi L25F2
|
|
L25FD:
|
|
iny
|
|
lda TOKEN_NAME_TABLE,y
|
|
bmi L25CA
|
|
jsr OUTDO
|
|
bne L25FD
|
|
|