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Assembly Source File | 1984-04-29 | 16KB | 1,288 lines

; ; SPACEWAR FOR IMSAI 8080 AND TEKTRONIX 4013 (9600 BAUD). ; ; COPYRIGHT (C) 1977 ; BY JEFFREY L. ZURKOW ; ; ORG 100H ; ; DI LXI H,0 DAD SP SHLD SPSAVE LXI SP,STACK LDA 70Q STA SAVE71 LHLD 71Q SHLD SAVE72 MVI A,0C3H STA 70Q LXI H,INT7 SHLD 71Q RESTART: DI MVI C,ESC CALL TYOUT MVI C,FF CALL TYOUT IN 0FFH ANI 1 JZ RS1 MVI C,ESC CALL TYOUT MVI C,112 CALL TYOUT RS1: MVI A,1 OUT 8 ;ENABLE TEKTRONIX IN AND OUT INTERRUPTS XRA A STA BUFSW STA TLIFE1 STA RSTAR1 STA RSTAR2 STA HIT1 STA HIT2 STA MTHRUST1 STA MTHRUST2 STA VTHETA1 STA VTHETA2 LXI H,BUF1 SHLD OUTBUF SHLD BPOINT MVI M,0 INX H MVI M,13 LXI H,BUF2 SHLD CURBUF LXI H,BUF3 SHLD MIDBUF MVI M,13 MVI A,PI/2 STA THETA1 MVI A,3*PI/2 STA THETA2 LXI H,32 * X1INIT SHLD X1 SHLD T1X LXI H,32 * Y1INIT SHLD Y1 SHLD T1Y LXI H,32 * X2INIT SHLD X2 LXI H,32 * Y2INIT SHLD Y2 LXI H,0 SHLD VX1 SHLD VY1 SHLD VX2 SHLD VY2 EI JMP START ; ; SAVE71: DB 0 SAVE72: DW 0 BPOINT: DW 0 ; ; GLOBAL EQUATES ; ====== ======= ; ; TEKSTAT EQU 3 TEKDATA EQU 2 PI EQU 200Q THRUST EQU 0FH ;MAIN THRUST MAGNITUDE TSPEED EQU 09H ;TORPEDO SPEED TLIFE EQU 20H ;TORPEDO LIFETIME ESC EQU 27 FF EQU 12 FRATE EQU 07H RRATE EQU 01H DELTA EQU 0FFH EXRATE EQU 03H SMAX EQU 14 X1INIT EQU 150 Y1INIT EQU 150 X2INIT EQU 875 Y2INIT EQU 640 THETA0 EQU PI/2 DELAY EQU 100 SIZE EQU 3 ; ; ; ; ; KEYBOARD SHIP CONTROL CHARACTERS ; ======== ==== ======= ========== ; ; LEFT1C EQU 'A' RT1C EQU 'S' FOR1C EQU 'D' TORP1C EQU 'F' ; LEFT2C EQU 'J' RT2C EQU 'K' FOR2C EQU 'L' TORP2C EQU ';' ; CTRLC EQU 03 ; ; ; ; OUTPUT BUFFER STUFF ; ====== ====== ===== ; ; BUFSW: DB 0 OUTBUF: DW 0 MIDBUF: DW 0 CURBUF: DW 0 ; ; ; ; ; ; START: LHLD CURBUF ST0: CALL SHIP1 CALL TORP1 CALL SHIP2 CALL TORP2 MVI M,13 ; LXI H,RATE INR M ; DI LHLD CURBUF XCHG LHLD MIDBUF SHLD CURBUF XCHG SHLD MIDBUF MVI A,1 STA BUFSW EI ; ; ; ROTATION INTEGRATORS ; LDA RATE ANI RRATE JNZ ST1 ; LDA THETA1 MOV B,A LDA VTHETA1 ADD B STA THETA1 ; LDA THETA2 MOV B,A LDA VTHETA2 ADD B STA THETA2 ; ST1: LHLD X1 XCHG LHLD VX1 DAD D MOV A,H ANI 7FH MOV H,A SHLD X1 ; LHLD Y1 XCHG LHLD VY1 DAD D MOV A,H ANI 7FH MOV H,A SHLD Y1 ; LHLD VX2 XCHG LHLD X2 DAD D MOV A,H ANI 7FH MOV H,A SHLD X2 ; LHLD VY2 XCHG LHLD Y2 DAD D MOV A,H ANI 7FH MOV H,A SHLD Y2 ; LDA TLIFE1 ORA A JZ ST2 LHLD T1X XCHG LHLD VT1X DAD D MOV A,H ANI 7FH MOV H,A SHLD T1X ; LHLD T1Y XCHG LHLD VT1Y DAD D MOV A,H ANI 7FH MOV H,A SHLD T1Y ; JMP ST2A ; ; ST2: LHLD X1 SHLD T1X LHLD Y1 SHLD T1Y ; ; ST2A: LDA TLIFE2 ORA A JZ ST2B LHLD T2X XCHG LHLD VT2X DAD D MOV A,H ANI 7FH MOV H,A SHLD T2X ; LHLD T2Y XCHG LHLD VT2Y DAD D MOV A,H ANI 7FH MOV H,A SHLD T2Y JMP ST3A ; ST2B: LHLD X2 SHLD T2X LHLD Y2 SHLD T2Y ; ; ST3A: LDA RATE ANI EXRATE JNZ ST4 LDA HIT2 ORA A JZ ST3B LXI H,DELAY2 DCR M JZ RESTART LXI H,RSTAR2 MOV A,M CPI SMAX*4 JNC ST3B INR A MOV M,A ; ST3B: LDA HIT1 ORA A JZ ST4 LXI H,DELAY2 DCR M JZ RESTART LXI H,RSTAR1 MOV A,M CPI SMAX*4 JNC ST4 INR A MOV M,A ; ST4: LDA TLIFE1 ORA A JZ ST6 LHLD X2 XCHG LHLD T1X CALL NBRHD JNZ ST5 LHLD Y2 XCHG LHLD T1Y CALL NBRHD JNZ ST5 XRA A STA TLIFE1 CALL KILL2 ; ST5: LHLD X1 XCHG LHLD T1X CALL NBRHD JNZ ST6 LHLD Y1 XCHG LHLD T1Y CALL NBRHD JNZ ST6 XRA A STA TLIFE1 CALL KILL1 ; ST6: LDA TLIFE2 ORA A JZ ST8 LHLD X1 XCHG LHLD T2X CALL NBRHD JNZ ST7 LHLD Y1 XCHG LHLD T2Y CALL NBRHD JNZ ST7 XRA A STA TLIFE2 CALL KILL1 ; ST7: LHLD X2 XCHG LHLD T2X CALL NBRHD JNZ ST8 LHLD Y2 XCHG LHLD T2Y CALL NBRHD JNZ ST8 XRA A STA TLIFE2 CALL KILL2 ; ST8: LHLD X1 XCHG LHLD X2 CALL NBRHD JNZ ST9 LHLD Y1 XCHG LHLD Y2 CALL NBRHD JNZ ST9 CALL KILL1 CALL KILL2 ; ST9: JMP START ; ; ; ; KILL1: LDA HIT1 ORA A RNZ STA MTHRUST1 INR A STA HIT1 STA RSTAR1 MVI A,DELAY STA DELAY2 RET ; ; KILL2: LDA HIT2 ORA A RNZ STA MTHRUST2 INR A STA HIT2 STA RSTAR2 MVI A,DELAY STA DELAY2 RET ; ; ; ; LEAVE: DI LHLD SPSAVE SPHL MVI A,13 CALL TYOUT MVI A,10 CALL TYOUT LDA SAVE71 STA 70Q LHLD SAVE72 SHLD 71Q XRA A OUT 8 RET ; ; ; ; NBRHD: MOV A,L SUB E MOV L,A MOV A,H SBB D MOV H,A JP NB1 CMA MOV H,A MOV A,L CMA MOV L,A INX H NB1: LXI D,NOT DELTA MOV A,D ANA H MOV H,A MOV A,E ANA L ORA H RET ; ; ; ; ; POINT ; ===== ; ; POINT GENERATES A POINT FROM POLAR COORDINATES, WITH ORIGIN ; AT (X,Y) AND THE WHOLE COORDINATE SYSTEM ROTATED BY THETA ; ABOUT THE ORIGIN. CALL POINT WITH THE RADIUS IN B, ; THE ANGLE IN C, AND HL POINTING TO THE MEMORY BUFFER WHERE ; THE RESULTS ARE TO BE PUT. ON RETURN, THE BUFFER WILL CONTAIN ; FIVE NEW BYTES, STARTING AT THE PREVIOUS (HL): 4 BYTES ARE ; THE TEK 4013 COORDINATES OF THE FINAL POINT, Y FIRST, ; AND THE FIFTH IS A ZERO BYTE TO ALLOW PROPER SETTLING TIME FOR ; THE VECTOR GENERATOR IN THE 4013. HL WILL POINT TO THE BYTE ; AFTER THE NUL (ZERO) BYTE. ; ; POINT: PUSH H ;SAVE BUFFER ADDRESS LDA THETA ;GET SHIP ANGLE ADD C ;ADD ANGLE FOR THIS POINT MOV C,A PUSH B ;SAVE RADIUS (R) AND NEW ANGLE CALL SIN POP B ;GET R AGAIN (SIN CLOBBERED B) PUSH B ; BUT LEAVE IT ON STACK. MOV E,A ;PUT SINE IN E FOR MULTIPLIER CALL MUL ;THIS GETS R*SIN(THETA+PHI) IN HL CALL SHIFT ;THIS SCALES THE RESULT XCHG ;NOW ADD Y LHLD Y DAD D MOV A,H RLC JC ERASE1 CALL TEKY ;CONVERT TO 4013 FORMAT POP B XCHG ;SAVE RESULT POP H ;GET BUFFER ADDRESS MOV M,D ;SAVE FIRST BYTE INX H MOV M,E ;SAVE SECOND BYTE INX H PUSH H PUSH B MOV A,C CALL COS ;GET COSINE(THETA+PHI) POP B ;GET R AGAIN MOV E,A ;SET UP FOR MULTIPLY CALL MUL CALL SHIFT XCHG LHLD X DAD D MOV A,H RLC JC ERASE2 CALL TEKX XCHG POP H MOV M,D INX H MOV M,E INX H XRA A ; MOV M,A ; INX H ; MOV M,A ; INX H ORA A RET ERASE1: POP B ERASE2: POP H STC RET ; ; ; ; SHIP1: PUSH H LDA THETA1 STA THETA LHLD X1 SHLD X LHLD Y1 SHLD Y LHLD VX1 SHLD VX LHLD VY1 SHLD VY LDA MTHRUST1 ORA A JZ SHP1B LDA RATE ANI FRATE JNZ SHP1B MVI A,THRUST STA MAG CALL RESOLVE LHLD VX SHLD VX1 LHLD VY SHLD VY1 ; SHP1B: LDA T1GO ORA A JZ SHP1C XRA A STA T1GO MVI A,TLIFE STA TLIFE1 CALL FIRE LHLD VX SHLD VT1X LHLD VY SHLD VT1Y ; LHLD X SHLD T1X LHLD Y SHLD T1Y SHP1C: POP H ; LDA HIT1 ORA A LDA RSTAR1 JNZ STARB ; PUSH H MVI M,29 INX H MVI B,5*SIZE MVI C,0 CALL POINT JC BLANK1 MVI B,4*SIZE MVI C,200Q LDA MTHRUST1 ORA A JZ SHP1A MVI B,6*SIZE SHP1A: CALL POINT JC BLANK1 MVI M,29 INX H MVI B,5*SIZE MVI C,9AH CALL POINT JC BLANK1 MVI B,5*SIZE MVI C,66H CALL POINT JC BLANK1 POP B ;CLEAR STACK RET BLANK1: POP H RET ; ; ; ; SHIP2: PUSH H LDA THETA2 STA THETA LHLD X2 SHLD X LHLD Y2 SHLD Y LHLD VX2 SHLD VX LHLD VY2 SHLD VY LDA MTHRUST2 ORA A JZ SHP2A LDA RATE ANI FRATE JNZ SHP2A MVI A,THRUST STA MAG CALL RESOLVE LHLD VX SHLD VX2 LHLD VY SHLD VY2 ; SHP2A: LDA T2GO ORA A JZ SHP2B XRA A STA T2GO MVI A,TLIFE STA TLIFE2 CALL FIRE LHLD VX SHLD VT2X LHLD VY SHLD VT2Y ; LHLD X SHLD T2X LHLD Y SHLD T2Y ; SHP2B: POP H LDA HIT2 ORA A LDA RSTAR2 JNZ STARB PUSH H MVI M,29 INX H MVI B,5*SIZE MVI C,0 CALL POINT JC BLANK2 MVI B,5*SIZE MVI C,66H CALL POINT JC BLANK2 MVI B,5*SIZE MVI C,9AH CALL POINT JC BLANK2 MVI B,5*SIZE MVI C,0 CALL POINT JC BLANK2 LDA MTHRUST2 ORA A JZ SHP2C MVI M,29 INX H MVI B,3*SIZE MVI C,PI CALL POINT JC BLANK2 MVI B,5*SIZE MVI C,PI CALL POINT JC BLANK2 SHP2C: POP B RET BLANK2: POP H RET ; ; ; ; TORP1: MVI M,29 INX H PUSH H LHLD T1Y CALL TEKY XCHG POP H MOV M,D INX H MOV M,E INX H PUSH H LHLD T1X CALL TEKX XCHG POP H MOV M,D INX H MOV M,E INX H MVI M,0 INX H MVI M,0 INX H MOV M,E INX H RET ; ; ; ; ; TORP2: MVI M,29 INX H PUSH H LHLD T2Y CALL TEKY XCHG POP H MOV M,D INX H MOV M,E INX H PUSH H LHLD T2X CALL TEKX XCHG POP H MOV M,D INX H MOV M,E INX H XRA A MOV M,A INX H MOV M,A INX H MOV M,E INX H RET ; ; ; ; ; STARB: PUSH H STA RSTAR MVI M,29 INX H MVI C,0 CALL STARB1 MVI C,PI CALL STARB1 MVI M,29 INX H MVI C,5*PI/4 CALL STARB1 MVI C,PI/4 CALL STARB1 MVI M,29 INX H MVI C,PI/2 CALL STARB1 MVI C,3*PI/2 CALL STARB1 MVI M,29 INX H MVI C,7*PI/4 CALL STARB1 MVI C,3*PI/4 CALL STARB1 POP B RET ; STARB1: LDA RSTAR MOV B,A CALL POINT RNC POP B POP H RET ; ; ; ; ; ; INT7: PUSH PSW PUSH H IN TEKSTAT ANI 2 JNZ INPUT LHLD BPOINT MOV A,M CPI 13 JZ BUFEND OUT TEKDATA INX H SHLD BPOINT ; EXIT7: POP H POP PSW EI RET ; BUFEND: LDA BUFSW ORA A JZ BUFEN1 PUSH D XRA A STA BUFSW LHLD MIDBUF XCHG LHLD OUTBUF SHLD MIDBUF XCHG SHLD OUTBUF POP D ; BUFEN1: LHLD OUTBUF MOV A,M OUT TEKDATA INX H SHLD BPOINT LXI H,TLIFE1 MOV A,M ORA A JZ BUFEN2 DCR A MOV M,A ; BUFEN2: INX H MOV A,M ORA A JZ EXIT7 DCR A MOV M,A JMP EXIT7 ; INPUT: IN TEKDATA ANI 7FH CPI CTRLC JZ LEAVE MOV H,A LDA HIT1 ORA A MOV A,H JNZ INP1 LXI H,VTHETA1 CPI LEFT1C JZ LEFT CPI RT1C JZ RIGHT LXI H,MTHRUST1 CPI FOR1C JZ FORWD CPI TORP1C JZ FIRE1 INP1: MOV H,A LDA HIT2 ORA A MOV A,H JNZ INP2 LXI H,VTHETA2 CPI LEFT2C JZ LEFT CPI RT2C JZ RIGHT LXI H,MTHRUST2 CPI FOR2C JZ FORWD CPI TORP2C JZ FIRE2 ; INP2: JMP EXIT7 ; LEFT: INR M JMP EXIT7 ; RIGHT: DCR M JMP EXIT7 ; FORWD: MOV A,M ANI 1 XRI 1 MOV M,A JMP EXIT7 ; FIRE1: LDA TLIFE1 ORA A JNZ EXIT7 INR A STA T1GO JMP EXIT7 ; ; FIRE2: LDA TLIFE2 ORA A JNZ EXIT7 INR A STA T2GO JMP EXIT7 ; ; ; ; FIRE: LDA THETA PUSH PSW CALL COS MOV E,A PUSH D MVI B,5*SIZE CALL MUL CALL SHIFT XCHG LHLD X DAD D SHLD X POP D MVI B,TSPEED CALL MUL CALL SHIFT XCHG LHLD VX DAD D SHLD VX POP PSW CALL SIN MOV E,A PUSH D MVI B,5*SIZE CALL MUL CALL SHIFT XCHG LHLD Y DAD D SHLD Y POP D MVI B,TSPEED CALL MUL CALL SHIFT XCHG LHLD VY DAD D SHLD VY RET ; ; ; ; ; RESOLVE: LDA THETA PUSH PSW CALL COS MOV E,A LDA MAG MOV B,A CALL MUL MOV E,H MVI D,0 MOV A,H RLC JNC FORW1 MVI D,0FFH FORW1: LHLD VX DAD D SHLD VX POP PSW CALL SIN MOV E,A LDA MAG MOV B,A CALL MUL MOV E,H MVI D,0 MOV A,H RLC JNC FORW2 MVI D,0FFH FORW2: LHLD VY DAD D SHLD VY RET ; ; ; ; SHIFT: MOV A,L RRC RRC ANI 3FH MOV L,A MOV A,H RRC RRC ANI 0C0H ORA L MOV L,A MOV A,H RLC RRC RAR RLC RRC RAR MOV H,A RET ; RSTAR DB 0 RSTAR1 DB 0 RSTAR2 DB 0 HIT1: DB 0 HIT2: DB 0 T1GO DB 0 T2GO DB 0 DELAY2 DB 0 Y1 DW 390*32 X1 DW 514*32 Y DW 390*32 X DW 514*32 VX DW 0 VY DW 0 THETA DB 0 THETA1 DB 0 THETA2 DB 0 VTHETA1 DB 0 VTHETA2 DB 0 MTHRUST1 DB 0 MTHRUST2 DB 0 VX1 DW 0 VY1 DW 0 VX2 DW 0 VY2 DW 0 X2 DW 400*32 Y2 DW 250*32 T1X DW 0 T1Y DW 0 VT1X DW 0 VT1Y DW 0 T2X DW 0 T2Y DW 0 VT2X DW 0 VT2Y DW 0 TLIFE1 DB 0 TLIFE2 DB 0 RATE DB 0 MAG DB 0 SPSAVE DW 0 BUF1 DS 150 BUF2 DS 150 BUF3 DS 150 STACK DS 256 ; ; ; ; ; MULTIPLICATION ROUTINE ; ============== ======= ; ; ; THIS ROUTINE USES BOOTH'S ALGORITHM TO MULTIPLY ; TWO 8-BIT TWO'S-COMPLEMENT NUMBERS AND GENERATE ; A 16-BIT TWO'S-COMPLEMENT PRODUCT. ARGUMENTS ; ARE PASSED IN B AND E, AND THE PRODUCT IS RETURNED ; IN HL. ALL REGISTERS AND FLAGS ARE CLOBBERED ; EXCEPT E. ON RETURN, C IS ZERO, E IS INTACT, AND ; THE SIGN BIT OF E HAS BEEN EXTENDED THROUGH D. ; ; ; MUL: LXI H,0 ;CLEAR PRODUCT MOV A,E ;GET MULTIPLICAND MVI D,0 ;CLEAR HIGH BYTE OF MULTIPLICAND RLC ;TEST MULTIPLICAND SIGN BIT JNC POS MVI D,0FFH ;IF NEGATIVE, EXTEND SIGN BIT THRU D POS: ; ORA A ;CLEAR CARRY=B(-1) MVI C,8 ;STEP COUNT MOV A,B ;GET MULTIPLIER RAL ;SET UP TO BEGIN WITH BIT 7 ; LOOP: JC HBS ;JUMP IF B(K)=1 RLC ;TEST B(K-1) MOV B,A ;SAVE ROTATED MULTIPLIER JC LBS ;JUMP IF B(K-1)=0 ; NEXT: DCR C ;DECREMENT STEP COUNT RZ ;FINISHED IF C=0 DAD H ;SHIFT PRODUCT LEFT ONE PLACE MOV A,B ;GET MULTIPLIER AGAIN RRC ;RESTORE CARRY CHANGED BY DAD INSTR. MOV A,B ;ONCE AGAIN GET MULTIPLIER JMP LOOP ; HBS: RLC ;TEST B(K-1) MOV B,A ;SAVE ROTATED MULTIPLIER JC NEXT ;JUMP IF B(K)=B(K-1)=1 MOV A,L ;SUBTRACT MULTIPLICAND FROM PARTIAL PRODUCT SUB E MOV L,A MOV A,H SBB D MOV H,A JMP NEXT ; LBS: DAD D ;ADD MULTIPLICAND TO PARTIAL PRODUCT JMP NEXT ; ; ; ; ; ; ; ; ; SINE AND COSINE ROUTINE ; ======================= ; ; ; THIS ROUTINE FINDS SIN(X) AND COS(X) BY A TABLE ; LOOK-UP. ARGUMENTS ARE PASSED IN A AND VALUES ; RETURNED THERE. THE VALUE RETURNED IS AN EIGHT- ; BIT NUMBER IN TWO'S COMPLEMENT FORM, SUCH THAT ; SIN(0) YIELDS 7F HEX AND SIN(PI/2) YIELDS FF. ; ANGLES ARE REPRESENTED AS BINARY FRACTIONS OF ; 2 PI; THAT IS, PI=80H, PI/2 = 40H, AND SO FORTH. ; THERE ARE SEPARATE ENTRY POINTS FOR SINE AND ; COSINE. THE TABLE USED IS ONLY FOR THE FIRST ; QUADRANT AND CONTAINS 8-BIT UNSIGNED VALUES OF ; SIN(X). ONE BIT OF PRECISION IS LOST WHEN THESE ; ARE CONVERTED TO SIGNED 8-BIT NUMBERS. ; ; ; SINE TABLE ; ========== ; SINES: DB 000H,006H,00CH,013H,019H,01FH,025H,02CH DB 032H,038H,03EH,044H,04AH,050H,056H,05CH DB 062H,067H,06DH,073H,078H,07EH,083H,086H DB 08EH,093H,098H,09DH,0A2H,0A7H,0ACH,0B0H DB 0B5H,0B9H,0BDH,0C2H,0C6H,0CAH,0CDH,0D1H DB 0D5H,0D8H,0DBH,0DEH,0E2H,0E4H,0E7H,0EAH DB 0ECH,0EFH,0F1H,0F3H,0F5H,0F6H,0F8H,0FAH DB 0FBH,0FCH,0FDH,0FEH,0FFH,0FFH,0FFH,0FFH DB 0FFH ; ; ; ; ; COSINE ENTRY POINT ; ====== ===== ===== ; COS: ADI 100Q ; ; ; SINE ENTRY POINT ; ==== ===== ===== ; ; SIN: MVI C,1 ;CLEAR FLAG MOV B,A ;SAVE ARGUMENT RLC ;TEST BIT 7 JC Q34 ;SET- QUADRANT 3 OR 4 RLC ;TEST BIT 6 MOV A,B ;GET ARGUMENT BACK JNC Q1 ;JUMP IF 1ST QUADRANT MVI A,200Q ;BIT 6 SET- 2ND QUADRANT SUB B ;TAKE SIN(PI-X) Q1: LXI H,SINES ;GET START OF SINE TABLE MVI D,0 ;GET OFFSET IN DE MOV E,A DAD D ;GET ENTRY ADDRESS MOV A,M ;GET VALUE FROM TABLE ORA A ;CLEAR CARRY RAR ;DIVIDE BY TWO DCR C ;TEST FLAG RZ ;RETURN IF RESULT POSITIVE CMA ;NEGATE RESULT INR A RET ; Q34: MVI C,2 ;SET FLAG RLC ;TEST BIT 6 MOV A,B ;GET ARGUMENT BACK JC Q4 ;JUMP IF 4TH QUADRANT SUI 200Q ;SUBTRACT PI FROM ARGUMENT JMP Q1 ;NOW TREAT AS FIRST QUADRANT ; Q4: CMA ;NEGATE ARGUMENT INR A JMP Q1 ; ; ; ; ; ; ; ; OUTPUT CHARACTER TO SCOPE ; ====== ========= == ===== ; ; CALL WITH CHARACTER IN C. ; CLOBBERS A AND FLAGS. ; ; TYOUT: IN TEKSTAT RRC JNC TYOUT MOV A,C OUT TEKDATA RET ; ; ; ; ; TEKX AND TEKY ; ============= ; ; THESE ROUTINES TAKE A 10-BIT QUANTITY IN HL, CONVERT IT ; TO TEKTRONIX 4013 COORDINATES, AND LEAVE THE TWO RESULTING ; BYTES IN H AND L. TEKY APPENDS THE PROPER HIGH-ORDER ; OCTAL DIGIT (IN EACH BYTE) FOR Y-COORDINATES, AND ; TEKX DOES THE SAME FOR X-COORDINATES. ; ; ; TEKX: MVI B,40H DB 11H TEKY: MVI B,60H MOV C,H MOV A,H RRC RRC ANI 1FH ORI 20H MOV H,A MOV A,L RLC RLC RLC ANI 7 MOV L,A MOV A,C RLC RLC RLC ANI 18H ORA L ORA B MOV L,A RET ; ; ; ; ; ; ; END