**Operation:**

**Here is a novel idea for using the printer port of a PC, for con-trol application using software and some interface hardware. The interface circuit along with the given software can be used with the printer port of any PC for controlling up to eight equipment.**

**The interface circuit shown in the figure is drawn for only one device, being controlled by D0 bit at pin 2 of the 25-pin parallel port. Identical circuits for the remaining data bits D1 through D7 (available at pins 3 through 9) have to be similarly wired. The use of opto-coupler ensures complete isolation of the PC from the relay driver circuitry.**

**When the program is loaded and run, the monitor will show the control panel-with the control bar at the extreme left. The bar can be moved using the right and left arrow keys. Switching on/off of bits D0-D7 is done by bringing the bar over the appropriate square and then pressing the ‘Q’ key for ON and ‘W’ key for OFF operation. The monitor will show the status of the relevant switch by indicating ‘1’ for ON and ‘0’ for OFF status of the switch. In addition, the current date and time is also displayed on the screen.**

**Program Listing in Basic:**

**CLS : SCREEN 2**

KEY(1) ON: ON KEY(1) GOSUB FINIS

KEY(5) ON: ON KEY(5) GOSUB RETIRE

KEY(10) ON: ON KEY(10) GOSUB ALLON

PORT% = &H378

OUT PORT%, 0

LOCATE 8, 10: PRINT "<--- --->"

V$ = STRING$(27, "²")

LOCATE 5, 6: PRINT V$; SPC(1); "CONTROL PANEL"; SPC(2); V$

LINE (40, 31)-(600, 180), 1, B

LINE (40, 40)-(600, 180), 1, B

LINE (40, 100)-(600, 120), 1, BF

LINE (140, 40)-(460, 110), 1, B

LOCATE 8, 65: PRINT "ON-----Q"

LOCATE 12, 65: PRINT "OFF----W"

LOCATE 19, 15: PRINT "F1"; SPC(24); "F5"; SPC(27); "F10"

LOCATE 21, 10: PRINT "EMERGENCY OFF"; SPC(16); "LOGOUT"; SPC(24); "ALLON"

D$ = DATE$

J$ = MID$(D$, 1, 3)

K$ = MID$(D$, 4, 3)

L$ = MID$(D$, 9, 2) LOCATE 5, 7: PRINT SPC(1); K$; J$; L$; SPC(1); ""

STAT:

PSET (145, 85): DRAW "R20U10L20D10"

PSET (185, 85): DRAW "R20U10L20D10"

PSET (225, 85): DRAW "R20U10L20D10"

PSET (265, 85): DRAW "R20U10L20D10"

PSET (305, 85): DRAW "R20U10L20D10"

PSET (345, 85): DRAW "R20U10L20D10"

PSET (385, 85): DRAW "R20U10L20D10"

PSET (425, 85): DRAW "R20U10L20D10"

T$ = TIME$

Y$ = MID$(T$, 1, 2)

Y = VAL(Y$)

IF Y < 12 THEN PP$ = "AM" ELSE PP$ = "PM"

IF Y > 12 THEN Y = Y - 12

U$ = MID$(T$, 3, 3)

LOCATE 5, 64: PRINT SPC(1); Y; U$; PP$; SPC(1); ""

LOCATE 9, 20: PRINT "1"; SPC(4); "2"; SPC(4); "3"; SPC(4); "4"; SPC(4); "5"; SPC(4); "6"; SPC(4); "7"; SPC(4); "8"

LOCATE 12, 19: PRINT AA; SPC(2); SS; SPC(2); DD; SPC(2); FF; SPC(2); GG; SPC(1); SPC(1); HH;

SPC(2); JJ; SPC(2); KK

X$ = INKEY$

X$ = RIGHT$(X$, 1)

N = INP(PORT%)

IF X$ = "K" THEN J = J - 40

IF X$ = "M" THEN J = J + 40

PSET (J + 105, 85): DRAW

"R20U10L20D10R2U10R2D10R2U10R2D10R2U10R2D10R2U10R2D10R2U10R2D10"

FOR T = 1 TO 400: NEXT

PRESET (J + 105, 85): DRAW

"R20U10L20D10R2U10R2D10R2U10R2D10R2U10R2D10R2U10R2D10R2U10R2D10"

IF J + 105 < 105 THEN J = 0

IF J >= 360 THEN J = 360

IF (J = 40) AND (X$ = "Q" OR X$ = "q") THEN GOSUB APPLE

IF (J = 40) AND (X$ = "W" OR X$ = "w") THEN GOSUB APPLEOF

IF (J = 80) AND (X$ = "Q" OR X$ = "q") THEN GOSUB BAT

IF (J = 80) AND (X$ = "W" OR X$ = "w") THEN GOSUB BATOF

IF (J = 120) AND (X$ = "Q" OR X$ = "q") THEN GOSUB TALE

IF (J = 120) AND (X$ = "W" OR X$ = "w") THEN GOSUB TALEOF

IF (J = 160) AND (X$ = "Q" OR X$ = "q") THEN GOSUB FLAT

IF (J = 160) AND (X$ = "W" OR X$ = "w") THEN GOSUB FLATOF

IF (J = 200) AND (X$ = "Q" OR X$ = "q") THEN GOSUB FAT

IF (J = 200) AND (X$ = "W" OR X$ = "w") THEN GOSUB FATOF

IF (J = 240) AND (X$ = "Q" OR X$ = "q") THEN GOSUB SILK

IF (J = 240) AND (X$ = "W" OR X$ = "w") THEN GOSUB SILKOF

IF (J = 280) AND (X$ = "Q" OR X$ = "q") THEN GOSUB SEVEN

IF (J = 280) AND (X$ = "W" OR X$ = "w") THEN GOSUB SEVENOF

IF (J = 320) AND (X$ = "Q" OR X$ = "q") THEN GOSUB LAST

IF (J = 320) AND (X$ = "W" OR X$ = "w") THEN GOSUB LASTOF

GOTO STAT '------------ALL THE SUBROUTINES ARE BELOW--------------

APPLE: SOUND 500, 2

AA = 1

LOCATE 6, 50

Q = 1 OR N

OUT PORT%, Q

RETURN

BAT: SOUND 500, 2

SS = 1

W = 2 OR N

OUT PORT%, W

RETURN

TALE: SOUND 500, 2

DD = 1

Q = 4 OR N

OUT PORT%, Q

RETURN

FLAT: SOUND 500, 2

FF = 1

Q = 8 OR N

OUT PORT%, Q

RETURN

FAT: SOUND 500, 2

GG = 1

Q = 16 OR N

OUT PORT%, Q

RETURN

SILK: SOUND 500, 2

HH = 1

Q = 32 OR N

OUT PORT%, Q

RETURN

SEVEN: SOUND 500, 2

JJ = 1

Q = 64 OR N

OUT PORT%, Q

RETURN

LAST: SOUND 500, 2

KK = 1

Q = 128 OR N

OUT PORT%, Q

RETURN

TALEOF: SOUND 400, 1

IF DD = 0 THEN RETURN

DD = 0

IF N = 4 THEN P = 0

IF N < 4 THEN P = N

IF N > 4 THEN P = N - 4

OUT PORT%, P RETURN

APPLEOF: SOUND 400, 1

IF AA = 0 THEN RETURN

AA = 0

IF N = 1 THEN I = 0

IF N > 1 THEN I = N - 1

OUT PORT%, I

RETURN BATOF: SOUND 400, 1

IF SS = 0 THEN RETURN

SS = 0

IF N = 2 THEN U = 0

IF N > 2 THEN U = N - 2

IF N < 2 THEN U = N

OUT PORT%, U RETURN

FLATOF: SOUND 400, 1

IF FF = 0 THEN RETURN FF = 0

IF N = 8 THEN E = 0

IF N < 8 THEN E = N

IF N > 8 THEN E = N - 8

OUT PORT%, E

RETURN

FATOF: SOUND 400, 1

IF GG = 0 THEN RETURN

GG = 0

IF N = 16 THEN Y = 0

IF N < 16 THEN Y = N

IF N > 16 THEN Y = N - 16

OUT PORT%, Y

RETURN

SILKOF: SOUND 400, 1

IF HH = 0 THEN RETURN

HH = 0 IF N = 32 THEN Y = 0

IF N < 32 THEN Y = N

IF N > 32 THEN Y = N - 32

OUT PORT%, Y

RETURN

SEVENOF: SOUND 400, 1

IF JJ = 0 THEN RETURN

JJ = 0

IF N = 64 THEN U = 0

IF N < 64 THEN U = N

IF N > 64 THEN U = N - 64

OUT PORT%, U

RETURN

LASTOF: SOUND 400, 1

IF KK = 0 THEN RETURN

KK = 0

IF N = 128 THEN Z = 0

IF N < 128 THEN Z = N

IF N > 128 THEN Z = N - 128

OUT PORT%, Z

RETURN

ALLON: SOUND 500, 4

OUT PORT%, 255

AA = 1: SS = 1: DD = 1: FF = 1: GG = 1: HH = 1: JJ = 1: KK = 1

RETURN

FINIS: SOUND 400, 2

OUT PORT%, 0

AA = 0: SS = 0: DD = 0: FF = 0: GG = 0: HH = 0: JJ = 0: KK = 0

RETURN

RETIRE:

OUT PORT%, 0

ENDKEY(1) ON: ON KEY(1) GOSUB FINIS

KEY(5) ON: ON KEY(5) GOSUB RETIRE

KEY(10) ON: ON KEY(10) GOSUB ALLON

PORT% = &H378

OUT PORT%, 0

LOCATE 8, 10: PRINT "<--- --->"

V$ = STRING$(27, "²")

LOCATE 5, 6: PRINT V$; SPC(1); "CONTROL PANEL"; SPC(2); V$

LINE (40, 31)-(600, 180), 1, B

LINE (40, 40)-(600, 180), 1, B

LINE (40, 100)-(600, 120), 1, BF

LINE (140, 40)-(460, 110), 1, B

LOCATE 8, 65: PRINT "ON-----Q"

LOCATE 12, 65: PRINT "OFF----W"

LOCATE 19, 15: PRINT "F1"; SPC(24); "F5"; SPC(27); "F10"

LOCATE 21, 10: PRINT "EMERGENCY OFF"; SPC(16); "LOGOUT"; SPC(24); "ALLON"

D$ = DATE$

J$ = MID$(D$, 1, 3)

K$ = MID$(D$, 4, 3)

L$ = MID$(D$, 9, 2) LOCATE 5, 7: PRINT SPC(1); K$; J$; L$; SPC(1); ""

STAT:

PSET (145, 85): DRAW "R20U10L20D10"

PSET (185, 85): DRAW "R20U10L20D10"

PSET (225, 85): DRAW "R20U10L20D10"

PSET (265, 85): DRAW "R20U10L20D10"

PSET (305, 85): DRAW "R20U10L20D10"

PSET (345, 85): DRAW "R20U10L20D10"

PSET (385, 85): DRAW "R20U10L20D10"

PSET (425, 85): DRAW "R20U10L20D10"

T$ = TIME$

Y$ = MID$(T$, 1, 2)

Y = VAL(Y$)

IF Y < 12 THEN PP$ = "AM" ELSE PP$ = "PM"

IF Y > 12 THEN Y = Y - 12

U$ = MID$(T$, 3, 3)

LOCATE 5, 64: PRINT SPC(1); Y; U$; PP$; SPC(1); ""

LOCATE 9, 20: PRINT "1"; SPC(4); "2"; SPC(4); "3"; SPC(4); "4"; SPC(4); "5"; SPC(4); "6"; SPC(4); "7"; SPC(4); "8"

LOCATE 12, 19: PRINT AA; SPC(2); SS; SPC(2); DD; SPC(2); FF; SPC(2); GG; SPC(1); SPC(1); HH;

SPC(2); JJ; SPC(2); KK

X$ = INKEY$

X$ = RIGHT$(X$, 1)

N = INP(PORT%)

IF X$ = "K" THEN J = J - 40

IF X$ = "M" THEN J = J + 40

PSET (J + 105, 85): DRAW

"R20U10L20D10R2U10R2D10R2U10R2D10R2U10R2D10R2U10R2D10R2U10R2D10"

FOR T = 1 TO 400: NEXT

PRESET (J + 105, 85): DRAW

"R20U10L20D10R2U10R2D10R2U10R2D10R2U10R2D10R2U10R2D10R2U10R2D10"

IF J + 105 < 105 THEN J = 0

IF J >= 360 THEN J = 360

IF (J = 40) AND (X$ = "Q" OR X$ = "q") THEN GOSUB APPLE

IF (J = 40) AND (X$ = "W" OR X$ = "w") THEN GOSUB APPLEOF

IF (J = 80) AND (X$ = "Q" OR X$ = "q") THEN GOSUB BAT

IF (J = 80) AND (X$ = "W" OR X$ = "w") THEN GOSUB BATOF

IF (J = 120) AND (X$ = "Q" OR X$ = "q") THEN GOSUB TALE

IF (J = 120) AND (X$ = "W" OR X$ = "w") THEN GOSUB TALEOF

IF (J = 160) AND (X$ = "Q" OR X$ = "q") THEN GOSUB FLAT

IF (J = 160) AND (X$ = "W" OR X$ = "w") THEN GOSUB FLATOF

IF (J = 200) AND (X$ = "Q" OR X$ = "q") THEN GOSUB FAT

IF (J = 200) AND (X$ = "W" OR X$ = "w") THEN GOSUB FATOF

IF (J = 240) AND (X$ = "Q" OR X$ = "q") THEN GOSUB SILK

IF (J = 240) AND (X$ = "W" OR X$ = "w") THEN GOSUB SILKOF

IF (J = 280) AND (X$ = "Q" OR X$ = "q") THEN GOSUB SEVEN

IF (J = 280) AND (X$ = "W" OR X$ = "w") THEN GOSUB SEVENOF

IF (J = 320) AND (X$ = "Q" OR X$ = "q") THEN GOSUB LAST

IF (J = 320) AND (X$ = "W" OR X$ = "w") THEN GOSUB LASTOF

GOTO STAT '------------ALL THE SUBROUTINES ARE BELOW--------------

APPLE: SOUND 500, 2

AA = 1

LOCATE 6, 50

Q = 1 OR N

OUT PORT%, Q

RETURN

BAT: SOUND 500, 2

SS = 1

W = 2 OR N

OUT PORT%, W

RETURN

TALE: SOUND 500, 2

DD = 1

Q = 4 OR N

OUT PORT%, Q

RETURN

FLAT: SOUND 500, 2

FF = 1

Q = 8 OR N

OUT PORT%, Q

RETURN

FAT: SOUND 500, 2

GG = 1

Q = 16 OR N

OUT PORT%, Q

RETURN

SILK: SOUND 500, 2

HH = 1

Q = 32 OR N

OUT PORT%, Q

RETURN

SEVEN: SOUND 500, 2

JJ = 1

Q = 64 OR N

OUT PORT%, Q

RETURN

LAST: SOUND 500, 2

KK = 1

Q = 128 OR N

OUT PORT%, Q

RETURN

TALEOF: SOUND 400, 1

IF DD = 0 THEN RETURN

DD = 0

IF N = 4 THEN P = 0

IF N < 4 THEN P = N

IF N > 4 THEN P = N - 4

OUT PORT%, P RETURN

APPLEOF: SOUND 400, 1

IF AA = 0 THEN RETURN

AA = 0

IF N = 1 THEN I = 0

IF N > 1 THEN I = N - 1

OUT PORT%, I

RETURN BATOF: SOUND 400, 1

IF SS = 0 THEN RETURN

SS = 0

IF N = 2 THEN U = 0

IF N > 2 THEN U = N - 2

IF N < 2 THEN U = N

OUT PORT%, U RETURN

FLATOF: SOUND 400, 1

IF FF = 0 THEN RETURN FF = 0

IF N = 8 THEN E = 0

IF N < 8 THEN E = N

IF N > 8 THEN E = N - 8

OUT PORT%, E

RETURN

FATOF: SOUND 400, 1

IF GG = 0 THEN RETURN

GG = 0

IF N = 16 THEN Y = 0

IF N < 16 THEN Y = N

IF N > 16 THEN Y = N - 16

OUT PORT%, Y

RETURN

SILKOF: SOUND 400, 1

IF HH = 0 THEN RETURN

HH = 0 IF N = 32 THEN Y = 0

IF N < 32 THEN Y = N

IF N > 32 THEN Y = N - 32

OUT PORT%, Y

RETURN

SEVENOF: SOUND 400, 1

IF JJ = 0 THEN RETURN

JJ = 0

IF N = 64 THEN U = 0

IF N < 64 THEN U = N

IF N > 64 THEN U = N - 64

OUT PORT%, U

RETURN

LASTOF: SOUND 400, 1

IF KK = 0 THEN RETURN

KK = 0

IF N = 128 THEN Z = 0

IF N < 128 THEN Z = N

IF N > 128 THEN Z = N - 128

OUT PORT%, Z

RETURN

ALLON: SOUND 500, 4

OUT PORT%, 255

AA = 1: SS = 1: DD = 1: FF = 1: GG = 1: HH = 1: JJ = 1: KK = 1

RETURN

FINIS: SOUND 400, 2

OUT PORT%, 0

AA = 0: SS = 0: DD = 0: FF = 0: GG = 0: HH = 0: JJ = 0: KK = 0

RETURN

RETIRE:

OUT PORT%, 0

END

*Circuit diagram:*

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