mirror of
https://github.com/mist64/msbasic.git
synced 2024-10-10 05:23:57 +00:00
581 lines
12 KiB
ArmAsm
581 lines
12 KiB
ArmAsm
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.segment "CODE"
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; ----------------------------------------------------------------------------
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; "FOR" STATEMENT
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;
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; FOR PUSHES 18 BYTES ON THE STACK:
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; 2 -- TXTPTR
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; 2 -- LINE NUMBER
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; 5 -- INITIAL (CURRENT) FOR VARIABLE VALUE
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; 1 -- STEP SIGN
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; 5 -- STEP VALUE
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; 2 -- ADDRESS OF FOR VARIABLE IN VARTAB
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; 1 -- FOR TOKEN ($81)
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; ----------------------------------------------------------------------------
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FOR:
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lda #$80
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sta SUBFLG
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jsr LET
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jsr GTFORPNT
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bne L2619
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txa
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adc #FOR_STACK1
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tax
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txs
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L2619:
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pla
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pla
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lda #FOR_STACK2
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jsr CHKMEM
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jsr DATAN
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clc
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tya
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adc TXTPTR
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pha
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lda TXTPTR+1
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adc #$00
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pha
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lda CURLIN+1
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pha
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lda CURLIN
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pha
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lda #TOKEN_TO
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jsr SYNCHR
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jsr CHKNUM
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jsr FRMNUM
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lda FACSIGN
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ora #$7F
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and FAC+1
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sta FAC+1
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lda #<STEP
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ldy #>STEP
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sta INDEX
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sty INDEX+1
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jmp FRM_STACK3
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; ----------------------------------------------------------------------------
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; "STEP" PHRASE OF "FOR" STATEMENT
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; ----------------------------------------------------------------------------
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STEP:
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lda #<CON_ONE
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ldy #>CON_ONE
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jsr LOAD_FAC_FROM_YA
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jsr CHRGOT
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cmp #TOKEN_STEP
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bne L2665
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jsr CHRGET
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jsr FRMNUM
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L2665:
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jsr SIGN
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jsr FRM_STACK2
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lda FORPNT+1
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pha
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lda FORPNT
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pha
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lda #$81
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pha
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; ----------------------------------------------------------------------------
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; PERFORM NEXT STATEMENT
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; ----------------------------------------------------------------------------
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NEWSTT:
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jsr ISCNTC
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lda TXTPTR
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ldy TXTPTR+1
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.ifdef CBM2_KBD
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cpy #>INPUTBUFFER
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.endif
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.ifdef CBM2
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nop
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.endif
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.ifdef CBM2_KBD
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beq LC6D4
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.else
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beq L2683
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.endif
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sta OLDTEXT
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sty OLDTEXT+1
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LC6D4:
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ldy #$00
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L2683:
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lda (TXTPTR),y
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.ifndef CONFIG_11
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beq LA5DC
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cmp #$3A
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beq NEWSTT2
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SYNERR1:
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jmp SYNERR
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LA5DC:
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.else
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bne COLON
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.endif
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ldy #$02
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lda (TXTPTR),y
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clc
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.ifdef CBM2_KBD
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jeq L2701
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.else
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beq L2701
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.endif
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iny
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lda (TXTPTR),y
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sta CURLIN
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iny
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lda (TXTPTR),y
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sta CURLIN+1
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tya
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adc TXTPTR
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sta TXTPTR
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bcc NEWSTT2
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inc TXTPTR+1
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NEWSTT2:
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jsr CHRGET
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jsr EXECUTE_STATEMENT
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jmp NEWSTT
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; ----------------------------------------------------------------------------
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; EXECUTE A STATEMENT
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;
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; (A) IS FIRST CHAR OF STATEMENT
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; CARRY IS SET
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; ----------------------------------------------------------------------------
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EXECUTE_STATEMENT:
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.ifndef CONFIG_11_NOAPPLE
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beq RET1
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.ifndef APPLE
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sec
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.endif
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.else
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beq RET2
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.endif
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EXECUTE_STATEMENT1:
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sbc #$80
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.ifndef CONFIG_11
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jcc LET
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.else
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bcc LET1
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.endif
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cmp #NUM_TOKENS
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.ifdef CBM2_KBD
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bcs LC721
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.else
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bcs SYNERR1
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.endif
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asl a
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tay
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lda TOKEN_ADDRESS_TABLE+1,y
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pha
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lda TOKEN_ADDRESS_TABLE,y
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pha
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jmp CHRGET
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.ifdef CONFIG_11
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LET1:
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jmp LET
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COLON:
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cmp #$3A
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beq NEWSTT2
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SYNERR1:
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jmp SYNERR
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.endif
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.ifdef CBM2_KBD
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LC721:
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.ifdef KBD
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cmp #$45
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.else
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cmp #$4B
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.endif
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bne SYNERR1
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jsr CHRGET
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lda #TOKEN_TO
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jsr SYNCHR
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jmp GOTO
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.endif
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; ----------------------------------------------------------------------------
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; "RESTORE" STATEMENT
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; ----------------------------------------------------------------------------
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RESTORE:
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sec
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lda TXTTAB
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sbc #$01
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ldy TXTTAB+1
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bcs SETDA
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dey
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SETDA:
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sta DATPTR
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sty DATPTR+1
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RET2:
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rts
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.ifndef CONFIG_CBM_ALL
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; ----------------------------------------------------------------------------
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; SEE IF CONTROL-C TYPED
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; ----------------------------------------------------------------------------
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ISCNTC:
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.endif
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.ifdef KBD
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jsr LE8F3
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bcc RET1
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LE633:
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jsr LDE7F
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beq STOP
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cmp #$03
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bne LE633
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.endif
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.ifdef OSI
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jmp MONISCNTC
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nop
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nop
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nop
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nop
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lsr a
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bcc RET2
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jsr GETLN
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cmp #$03
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.endif
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.ifdef APPLE
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lda $C000
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cmp #$83
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beq L0ECC
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rts
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L0ECC:
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jsr RDKEY
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cmp #$03
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.endif
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.ifdef KIM
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lda #$01
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bit $1740
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bmi RET2
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ldx #$08
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lda #$03
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clc
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cmp #$03
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.endif
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; ----------------------------------------------------------------------------
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; "STOP" STATEMENT
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; ----------------------------------------------------------------------------
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STOP:
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bcs END2
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; ----------------------------------------------------------------------------
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; "END" STATEMENT
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; ----------------------------------------------------------------------------
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END:
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clc
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END2:
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bne RET1
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lda TXTPTR
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ldy TXTPTR+1
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.ifdef CBM2_KBD
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ldx CURLIN+1
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inx
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.endif
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beq END4
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sta OLDTEXT
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sty OLDTEXT+1
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CONTROL_C_TYPED:
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lda CURLIN
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ldy CURLIN+1
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sta OLDLIN
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sty OLDLIN+1
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END4:
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pla
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pla
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L2701:
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lda #<QT_BREAK
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ldy #>QT_BREAK
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.ifndef KBD
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ldx #$00
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stx Z14
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.endif
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bcc L270E
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jmp PRINT_ERROR_LINNUM
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L270E:
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jmp RESTART
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.ifdef KBD
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LE664:
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tay
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jmp SNGFLT
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.endif
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; ----------------------------------------------------------------------------
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; "CONT" COMMAND
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; ----------------------------------------------------------------------------
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CONT:
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bne RET1
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ldx #ERR_CANTCONT
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ldy OLDTEXT+1
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bne L271C
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jmp ERROR
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L271C:
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lda OLDTEXT
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sta TXTPTR
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sty TXTPTR+1
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lda OLDLIN
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ldy OLDLIN+1
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sta CURLIN
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sty CURLIN+1
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RET1:
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rts
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.ifdef KBD
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PRT:
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jsr GETBYT
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txa
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ror a
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ror a
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ror a
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sta $8F
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rts
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LE68C:
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ldy #$12
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LE68E:
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lda LEA30,y
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sta $03A2,y
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dey
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bpl LE68E
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rts
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.endif
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.if .def(CONFIG_NULL) || .def(CBM1)
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; CBM1 has the keyword removed,
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; but the code is, still here
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NULL:
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jsr GETBYT
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bne RET1
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inx
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cpx #NULL_MAX
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bcs L2739
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dex
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stx Z15
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rts
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||
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L2739:
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jmp IQERR
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.endif
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.ifndef CONFIG_11_NOAPPLE
|
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CLEAR:
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|
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bne RET1
|
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jmp CLEARC
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.endif
|
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|
|
|
||
|
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.ifdef APPLE
|
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|
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.include "apple_loadsave.s"
|
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.endif
|
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|
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.ifdef KIM
|
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|
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.include "kim_loadsave.s"
|
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|
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.endif
|
||
|
|
|
||
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; ----------------------------------------------------------------------------
|
||
|
|
; "RUN" COMMAND
|
||
|
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; ----------------------------------------------------------------------------
|
||
|
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RUN:
|
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|
|
bne L27CF
|
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jmp SETPTRS
|
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|
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L27CF:
|
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|
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jsr CLEARC
|
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|
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jmp L27E9
|
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|
|
|
||
|
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; ----------------------------------------------------------------------------
|
||
|
|
; "GOSUB" STATEMENT
|
||
|
|
;
|
||
|
|
; LEAVES 7 BYTES ON STACK:
|
||
|
|
; 2 -- RETURN ADDRESS (NEWSTT)
|
||
|
|
; 2 -- TXTPTR
|
||
|
|
; 2 -- LINE #
|
||
|
|
; 1 -- GOSUB TOKEN
|
||
|
|
; ----------------------------------------------------------------------------
|
||
|
|
GOSUB:
|
||
|
|
lda #$03
|
||
|
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jsr CHKMEM
|
||
|
|
lda TXTPTR+1
|
||
|
|
pha
|
||
|
|
lda TXTPTR
|
||
|
|
pha
|
||
|
|
lda CURLIN+1
|
||
|
|
pha
|
||
|
|
lda CURLIN
|
||
|
|
pha
|
||
|
|
lda #TOKEN_GOSUB
|
||
|
|
pha
|
||
|
|
L27E9:
|
||
|
|
jsr CHRGOT
|
||
|
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jsr GOTO
|
||
|
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jmp NEWSTT
|
||
|
|
|
||
|
|
; ----------------------------------------------------------------------------
|
||
|
|
; "GOTO" STATEMENT
|
||
|
|
; ALSO USED BY "RUN" AND "GOSUB"
|
||
|
|
; ----------------------------------------------------------------------------
|
||
|
|
GOTO:
|
||
|
|
jsr LINGET
|
||
|
|
jsr REMN
|
||
|
|
lda CURLIN+1
|
||
|
|
cmp LINNUM+1
|
||
|
|
bcs L2809
|
||
|
|
tya
|
||
|
|
sec
|
||
|
|
adc TXTPTR
|
||
|
|
ldx TXTPTR+1
|
||
|
|
bcc L280D
|
||
|
|
inx
|
||
|
|
bcs L280D
|
||
|
|
L2809:
|
||
|
|
lda TXTTAB
|
||
|
|
ldx TXTTAB+1
|
||
|
|
L280D:
|
||
|
|
.ifdef KBD
|
||
|
|
jsr LF457
|
||
|
|
bne UNDERR
|
||
|
|
.else
|
||
|
|
jsr FL1
|
||
|
|
bcc UNDERR
|
||
|
|
.endif
|
||
|
|
lda LOWTRX
|
||
|
|
sbc #$01
|
||
|
|
sta TXTPTR
|
||
|
|
lda LOWTRX+1
|
||
|
|
sbc #$00
|
||
|
|
sta TXTPTR+1
|
||
|
|
L281E:
|
||
|
|
rts
|
||
|
|
|
||
|
|
; ----------------------------------------------------------------------------
|
||
|
|
; "POP" AND "RETURN" STATEMENTS
|
||
|
|
; ----------------------------------------------------------------------------
|
||
|
|
POP:
|
||
|
|
bne L281E
|
||
|
|
lda #$FF
|
||
|
|
.ifdef CBM2_KBD
|
||
|
|
sta FORPNT+1 ; bugfix, wrong in AppleSoft
|
||
|
|
.else
|
||
|
|
sta FORPNT
|
||
|
|
.endif
|
||
|
|
jsr GTFORPNT
|
||
|
|
txs
|
||
|
|
cmp #TOKEN_GOSUB
|
||
|
|
beq RETURN
|
||
|
|
ldx #ERR_NOGOSUB
|
||
|
|
.byte $2C
|
||
|
|
UNDERR:
|
||
|
|
ldx #ERR_UNDEFSTAT
|
||
|
|
jmp ERROR
|
||
|
|
; ----------------------------------------------------------------------------
|
||
|
|
SYNERR2:
|
||
|
|
jmp SYNERR
|
||
|
|
; ----------------------------------------------------------------------------
|
||
|
|
RETURN:
|
||
|
|
pla
|
||
|
|
pla
|
||
|
|
sta CURLIN
|
||
|
|
pla
|
||
|
|
sta CURLIN+1
|
||
|
|
pla
|
||
|
|
sta TXTPTR
|
||
|
|
pla
|
||
|
|
sta TXTPTR+1
|
||
|
|
|
||
|
|
; ----------------------------------------------------------------------------
|
||
|
|
; "DATA" STATEMENT
|
||
|
|
; EXECUTED BY SKIPPING TO NEXT COLON OR EOL
|
||
|
|
; ----------------------------------------------------------------------------
|
||
|
|
DATA:
|
||
|
|
jsr DATAN
|
||
|
|
|
||
|
|
; ----------------------------------------------------------------------------
|
||
|
|
; ADD (Y) TO TXTPTR
|
||
|
|
; ----------------------------------------------------------------------------
|
||
|
|
ADDON:
|
||
|
|
tya
|
||
|
|
clc
|
||
|
|
adc TXTPTR
|
||
|
|
sta TXTPTR
|
||
|
|
bcc L2852
|
||
|
|
inc TXTPTR+1
|
||
|
|
L2852:
|
||
|
|
rts
|
||
|
|
|
||
|
|
; ----------------------------------------------------------------------------
|
||
|
|
; SCAN AHEAD TO NEXT ":" OR EOL
|
||
|
|
; ----------------------------------------------------------------------------
|
||
|
|
DATAN:
|
||
|
|
ldx #$3A
|
||
|
|
.byte $2C
|
||
|
|
REMN:
|
||
|
|
ldx #$00
|
||
|
|
stx CHARAC
|
||
|
|
ldy #$00
|
||
|
|
sty ENDCHR
|
||
|
|
L285E:
|
||
|
|
lda ENDCHR
|
||
|
|
ldx CHARAC
|
||
|
|
sta CHARAC
|
||
|
|
stx ENDCHR
|
||
|
|
L2866:
|
||
|
|
lda (TXTPTR),y
|
||
|
|
beq L2852
|
||
|
|
cmp ENDCHR
|
||
|
|
beq L2852
|
||
|
|
iny
|
||
|
|
cmp #$22
|
||
|
|
.ifndef CONFIG_11
|
||
|
|
beq L285E
|
||
|
|
bne L2866
|
||
|
|
.else
|
||
|
|
bne L2866
|
||
|
|
beq L285E
|
||
|
|
.endif
|
||
|
|
|
||
|
|
; ----------------------------------------------------------------------------
|
||
|
|
; "IF" STATEMENT
|
||
|
|
; ----------------------------------------------------------------------------
|
||
|
|
IF:
|
||
|
|
jsr FRMEVL
|
||
|
|
jsr CHRGOT
|
||
|
|
cmp #TOKEN_GOTO
|
||
|
|
beq L2884
|
||
|
|
lda #TOKEN_THEN
|
||
|
|
jsr SYNCHR
|
||
|
|
L2884:
|
||
|
|
lda FAC
|
||
|
|
bne L288D
|
||
|
|
|
||
|
|
; ----------------------------------------------------------------------------
|
||
|
|
; "REM" STATEMENT, OR FALSE "IF" STATEMENT
|
||
|
|
; ----------------------------------------------------------------------------
|
||
|
|
REM:
|
||
|
|
jsr REMN
|
||
|
|
beq ADDON
|
||
|
|
L288D:
|
||
|
|
jsr CHRGOT
|
||
|
|
bcs L2895
|
||
|
|
jmp GOTO
|
||
|
|
L2895:
|
||
|
|
jmp EXECUTE_STATEMENT
|
||
|
|
|
||
|
|
; ----------------------------------------------------------------------------
|
||
|
|
; "ON" STATEMENT
|
||
|
|
;
|
||
|
|
; ON <EXP> GOTO <LIST>
|
||
|
|
; ON <EXP> GOSUB <LIST>
|
||
|
|
; ----------------------------------------------------------------------------
|
||
|
|
ON:
|
||
|
|
jsr GETBYT
|
||
|
|
pha
|
||
|
|
cmp #TOKEN_GOSUB
|
||
|
|
beq L28A4
|
||
|
|
L28A0:
|
||
|
|
cmp #TOKEN_GOTO
|
||
|
|
bne SYNERR2
|
||
|
|
L28A4:
|
||
|
|
dec FAC_LAST
|
||
|
|
bne L28AC
|
||
|
|
pla
|
||
|
|
jmp EXECUTE_STATEMENT1
|
||
|
|
L28AC:
|
||
|
|
jsr CHRGET
|
||
|
|
jsr LINGET
|
||
|
|
cmp #$2C
|
||
|
|
beq L28A4
|
||
|
|
pla
|
||
|
|
L28B7:
|
||
|
|
rts
|