mirror of
https://github.com/zellyn/a2audit.git
synced 2024-11-28 23:49:21 +00:00
304 lines
9.3 KiB
NASM
304 lines
9.3 KiB
NASM
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!zone monitor {
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.LOC0 = $00
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.LOC1 = $01
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.WNDLFT = $20
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.WNDWDTH = $21
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.WNDTOP = $22
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.WNDBTM = $23
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.CH = $24
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.CV = $25
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.GBASL = $26
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.GBASH = $27
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.BASL = $28
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.BASH = $29
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.BAS2L = $2A
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.BAS2H = $2B
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.V2 = $2D
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.MASK = $2E
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.COLOR = $30
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.INVFLG = $32
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.YSAV1 = $35
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.CSWL = $36
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.CSWH = $37
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.KSWL = $38
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.KSWH = $39
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.A2L = $3E
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.STATUS = $48
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.RNDL = $4E
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.RNDH = $4F
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.IOADR = $C000
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.KBD = $C000
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.KBDSTRB = $C010
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.SPKR = $C030
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.LORES = $C056
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.LOWSCR = $C054
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.TXTSET = $C051
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.TXTCLR = $C050
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.MIXSET = $C053
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.PLOT LSR ;Y-COORD/2
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PHP ;SAVE LSB IN CARRY
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JSR .GBASCALC ;CALC BASE ADR IN GBASL,H
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PLP ;RESTORE LSB FROM CARRY
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LDA #$0F ;MASK $0F IF EVEN
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BCC .RTMASK
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ADC #$E0 ;MASK $F0 IF ODD
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.RTMASK STA .MASK
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.PLOT1 LDA (.GBASL),Y ;DATA
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EOR .COLOR ; EOR COLOR
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AND .MASK ; AND MASK
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EOR (.GBASL),Y ; EOR DATA
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STA (.GBASL),Y ; TO DATA
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RTS
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.VLINEZ ADC #$01 ;NEXT Y-COORD
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.VLINE PHA ; SAVE ON STACK
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JSR .PLOT ; PLOT SQUARE
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PLA
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CMP .V2 ;DONE?
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BCC .VLINEZ ; NO, LOOP
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.RTS1 RTS
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.CLRSCR LDY #$2F ;MAX Y, FULL SCRN CLR
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BNE .CLRSC2 ;ALWAYS TAKEN
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.CLRTOP LDY #$27 ;MAX Y, TOP SCREEN CLR
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.CLRSC2 STY .V2 ;STORE AS BOTTOM COORD
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; FOR VLINE CALLS
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LDY #$27 ;RIGHTMOST X-COORD (COLUMN)
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.CLRSC3 LDA #$00 ;TOP COORD FOR VLINE CALLS
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STA .COLOR ;CLEAR COLOR (BLACK)
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JSR .VLINE ;DRAW VLINE
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DEY ;NEXT LEFTMOST X-COORD
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BPL .CLRSC3 ;LOOP UNTIL DONE
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RTS
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.GBASCALC PHA ;FOR INPUT 000DEFGH
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LSR
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AND #$03
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ORA #$04 ; GENERATE GBASH=000001FG
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STA .GBASH
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PLA ; AND GBASL=HDEDE000
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AND #$18
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BCC .GBCALC
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ADC #$7F
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.GBCALC STA .GBASL
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ASL
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ASL
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ORA .GBASL
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STA .GBASL
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RTS
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PRNTYX TYA
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.PRNTAX JSR PRBYTE ;OUTPUT TARGET ADR
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.PRNTX TXA ; OF BRANCH AND RETURN
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JMP PRBYTE
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.INIT LDA #$00 ;CLR STATUS FOR DEBUG
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STA .STATUS ; SOFTWARE
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LDA .LORES
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LDA .LOWSCR ;INIT VIDEO MODE
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.SETTXT LDA .TXTSET ;SET FOR TEXT MODE
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LDA #$00 ; FULL SCREEN WINDOW
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BEQ .SETWND
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.SETGR LDA .TXTCLR ;SET FOR GRAPHICS MODE
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LDA .MIXSET ; LOWER 4 LINES AS
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JSR .CLRTOP ; TEXT WINDOW
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LDA #$14
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.SETWND STA .WNDTOP ;SET FOR 40 COL WINDOW
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LDA #$00 ; TOP IN A-REG,
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STA .WNDLFT ; BTTM AT LINE 24
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LDA #$28
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STA .WNDWDTH
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LDA #$18
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STA .WNDBTM ; VTAB TO ROW 23
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LDA #$17
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.TABV STA .CV ;VTABS TO ROW IN A-REG
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JMP .VTAB
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.BASCALC PHA ;CALC BASE ADR IN BASL,H
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LSR ; FOR GIVEN LINE NO
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AND #$03 ; 0<=LINE NO.<=$17
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ORA #$04 ;ARG=000ABCDE, GENERATE
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STA .BASH ; BASH=000001CD
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PLA ; AND
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AND #$18 ; BASL=EABAB000
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BCC .BSCLC2
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ADC #$7F
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.BSCLC2 STA .BASL
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ASL
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ASL
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ORA .BASL
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STA .BASL
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RTS
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.BELL1 CMP #$87 ;BELL CHAR? (CNTRL-G)
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BNE .RTS2B ; NO, RETURN
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LDA #$40 ;DELAY .01 SECONDS
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JSR .WAIT
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LDY #$C0
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.BELL2 LDA #$0C ;TOGGLE SPEAKER AT
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JSR .WAIT ; 1 KHZ FOR .1 SEC.
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LDA .SPKR
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DEY
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BNE .BELL2
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.RTS2B RTS
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.STOADV LDY .CH ;CURSOR H INDEX TO Y-REG
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STA (.BASL),Y ;STORE CHAR IN LINE
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.ADVANCE INC .CH ;INCREMENT CURSOR H INDEX
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LDA .CH ; (MOVE RIGHT)
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CMP .WNDWDTH ;BEYOND WINDOW WIDTH?
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BCS .CR ; YES CR TO NEXT LINE
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.RTS3 RTS ; NO,RETURN
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.VIDOUT CMP #$A0 ;CONTROL CHAR?
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BCS .STOADV ; NO,OUTPUT IT.
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TAY ;INVERSE VIDEO?
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BPL .STOADV ; YES, OUTPUT IT.
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CMP #$8D ;CR?
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BEQ .CR ; YES.
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CMP #$8A ;LINE FEED?
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BEQ .LF ; IF SO, DO IT.
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CMP #$88 ;BACK SPACE? (CNTRL-H)
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BNE .BELL1 ; NO, CHECK FOR BELL.
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.BS DEC .CH ;DECREMENT CURSOR H INDEX
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BPL .RTS3 ;IF POS, OK. ELSE MOVE UP
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LDA .WNDWDTH ;SET CH TO WNDWDTH-1
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STA .CH
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DEC .CH ;(RIGHTMOST SCREEN POS)
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.UP LDA .WNDTOP ;CURSOR V INDEX
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CMP .CV
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BCS .RTS4 ;IF TOP LINE THEN RETURN
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DEC .CV ;DEC CURSOR V-INDEX
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.VTAB LDA .CV ;GET CURSOR V-INDEX
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.VTABZ JSR .BASCALC ;GENERATE BASE ADR
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ADC .WNDLFT ;ADD WINDOW LEFT INDEX
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STA .BASL ;TO BASL
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.RTS4 RTS
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.CLEOP1 PHA ;SAVE CURRENT LINE ON STK
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JSR .VTABZ ;CALC BASE ADDRESS
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JSR .CLEOLZ ;CLEAR TO EOL, SET CARRY
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LDY #$00 ;CLEAR FROM H INDEX=0 FOR REST
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PLA ;INCREMENT CURRENT LINE
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ADC #$00 ;(CARRY IS SET)
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CMP .WNDBTM ;DONE TO BOTTOM OF WINDOW?
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BCC .CLEOP1 ; NO, KEEP CLEARING LINES
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BCS .VTAB ; YES, TAB TO CURRENT LINE
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HOME LDA .WNDTOP ;INIT CURSOR V
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STA .CV ; AND H-INDICES
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LDY #$00
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STY .CH ;THEN CLEAR TO END OF PAGE
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BEQ .CLEOP1
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.CR LDA #$00 ;CURSOR TO LEFT OF INDEX
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STA .CH ;(RET CURSOR H=0)
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.LF INC .CV ;INCR CURSOR V(DOWN 1 LINE)
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LDA .CV
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CMP .WNDBTM ;OFF SCREEN?
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BCC .VTABZ ; NO, SET BASE ADDR
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DEC .CV ;DECR CURSOR V (BACK TO BOTTOM)
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.SCROLL LDA .WNDTOP ;START AT TOP OF SCRL WNDW
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PHA
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JSR .VTABZ ;GENERATE BASE ADR
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.SCRL1 LDA .BASL ;COPY BASL,H
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STA .BAS2L ; TO BAS2L,H
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LDA .BASH
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STA .BAS2H
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LDY .WNDWDTH ;INIT Y TO RIGHTMOST INDEX
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DEY ; OF SCROLLING WINDOW
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PLA
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ADC #$01 ;INCR LINE NUMBER
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CMP .WNDBTM ;DONE?
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BCS .SCRL3 ; YES, FINISH
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PHA
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JSR .VTABZ ;FORM BASL,H (BASE ADDR)
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.SCRL2 LDA (.BASL),Y ;MOVE A CHR UP ON LINE
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STA (.BAS2L),Y
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DEY ;NEXT CHAR OF LINE
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BPL .SCRL2
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BMI .SCRL1 ;NEXT LINE (ALWAYS TAKEN)
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.SCRL3 LDY #$00 ;CLEAR BOTTOM LINE
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JSR .CLEOLZ ;GET BASE ADDR FOR BOTTOM LINE
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BCS .VTAB ;CARRY IS SET
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.CLREOL LDY .CH ;CURSOR H INDEX
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.CLEOLZ LDA #$A0
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.CLEOL2 STA (.BASL),Y ;STORE BLANKS FROM 'HERE'
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INY ; TO END OF LINES (WNDWDTH)
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CPY .WNDWDTH
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BCC .CLEOL2
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RTS
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.WAIT SEC
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.WAIT2 PHA
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.WAIT3 SBC #$01
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BNE .WAIT3 ;1.0204 USEC
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PLA ;(13+27/2*A+5/2*A*A)
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SBC #$01
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BNE .WAIT2
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RTS
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KEYIN INC .RNDL
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BNE .KEYIN2 ;INCR RND NUMBER
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INC .RNDH
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.KEYIN2 BIT .KBD ;KEY DOWN?
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BPL KEYIN ; LOOP
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STA (.BASL),Y ;REPLACE FLASHING SCREEN
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LDA .KBD ;GET KEYCODE
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BIT .KBDSTRB ;CLR KEY STROBE
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RTS
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CROUT LDA #$8D
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BNE COUT
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PRBYTE PHA ;PRINT BYTE AS 2 HEX
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LSR ; DIGITS, DESTROYS A-REG
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LSR
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LSR
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LSR
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JSR .PRHEXZ
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PLA
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.PRHEX AND #$0F ;PRINT HEX DIG IN A-REG
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.PRHEXZ ORA #$B0 ; LSB'S
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CMP #$BA
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BCC COUT
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ADC #$06
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COUT JMP (.CSWL) ;VECTOR TO USER OUTPUT ROUTINE
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COUT1 CMP #$A0
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BCC .COUTZ ;DON'T OUTPUT CTRL'S INVERSE
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AND .INVFLG ;MASK WITH INVERSE FLAG
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.COUTZ STY .YSAV1 ;SAV Y-REG
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PHA ;SAV A-REG
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JSR .VIDOUT ;OUTPUT A-REG AS ASCII
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PLA ;RESTORE A-REG
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LDY .YSAV1 ; AND Y-REG
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RTS ; THEN RETURN
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.SETNORM LDY #$FF ;SET FOR NORMAL VID
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.SETIFLG STY .INVFLG
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RTS
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.SETKBD LDA #$00 ;SIMULATE PORT #0 INPUT
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.INPORT STA .A2L ; SPECIFIED (KEYIN ROUTINE)
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.INPRT LDX #.KSWL
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LDY #<KEYIN
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BNE .IOPRT
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.SETVID LDA #$00 ;SIMULATE PORT #0 OUTPUT
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.OUTPORT STA .A2L ; SPECIFIED (COUT1 ROUTINE)
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.OUTPRT LDX #.CSWL
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LDY #<COUT1
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.IOPRT LDA .A2L ;SET RAM IN/OUT VECTORS
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AND #$0F
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BEQ .IOPRT1
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ORA #>.IOADR
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LDY #$00
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BEQ .IOPRT2
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.IOPRT1 LDA #>COUT1
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.IOPRT2 STY .LOC0,X
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STA .LOC1,X
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RTS
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RESET JSR .SETNORM ;SET SCREEN MODE
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JSR .INIT ; AND INIT KBD/SCREEN
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JSR .SETVID ; AS I/O DEV'S
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JSR .SETKBD
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CLD ;MUST SET HEX MODE!
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RTS
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} ; monitor
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