====== SPACE DUEL ======
{{:tandy_color_computer:spacduel0.png }}

You are trapped outside your space capsule and someone is firing at you.

The situation is desperate; you have only seven shots.

This could be your last stand.

To move up and down use the joystick or keys Q and A respectively; fire with W.

If you are playing against a second player, they use the keys P and ; to move up and down; 0 fires.

If both players run out of shots, the game is declared a draw.

===== SCREENSHOTS =====
Instructions Page 1: \\
{{:tandy_color_computer:spacduel1.png}}

Instructions Page 2: \\
{{:tandy_color_computer:spacduel2.png}}

Playing: \\
{{:tandy_color_computer:spacduel3.png}}

===== SOURCE =====
A type-in BASIC program by Scott McCann for Tandy Color Computers with 16K RAM and Extended Color BASIC, published in TRS-80 Colour Computer Space Adventures.

Please note - this played through in 1-player mode without crashing but there may still be typoes in this code.

<code qbasic>
10 DIMA(38),B(38),C(46)
20 CLS: PRINT@10, "SPACE DUEL"
30 PRINT:PRINT" -LEFT PLAYER SHOOTS WITH 'W'   AND MOVES U/D WITH 'Q'&'A'."
40 PRINT:PRINT" -RIGHT PLAYER SHOOTS WITH '0'  AND MOVES U/D WITH 'P'&';'."
50 PRINT:PRINT" -JOYSTICKS MOVE PLAYER U/D AND FIRE WITH BUTTONS."
60 PRINT:PRINT"EACH PLAYER GETS 7 SHOTS. HOLD  FIRE DOWN UNTIL LASER HEATS UP, THEN LET GO TO FIRE.":PRINT:PRINT"<HIT ANY KEY TO CONTINUE>";
70 IF INKEY$="" THEN 70
80 CLS:PRINT" -WHEN PLAYING AGAINST THE      COMPUTER, IT GETS AN UNLIMITED  NUMBER OF SHOTS."
90 PRINT:PRINT" -A DRAW IS AWARDED IN THE EVENTTHAT BOTH PLAYERS RUN OUT OF    LASER SHOTS."
100 PRINT:PRINT" -HOLDING FIRE BUTTON DOWN WILL EXPELL LASER FIRE A FEW STEPS   BUT WILL NOT BE COUNTED AS A    SHOT FIRED.":PRINT:PRINT"<HIT ANY KEY>";
110 IF INKEY$ =""THEN110
120 PLAY"T19FE04FED03FEDG02FEDGD01FEDGDC03FEDCGF02DE01DE03DE04DE02DEFFD01C03DT255"
130 PMODE4,1:PCLS
140 DRAW"S4BM34,100;G4D3F1R1D1R3U1H2U2E1D3F1U5F1D4E1R1H1U1D3G2R2"
150 DRAW"D1L5G2D5F2G1D1R9U1L8E1R5U1"
160 DRAW"E2U1H1R3BR2U1NR2BL2L3E1H2U1E2U3H4NE4L2H4BD16BR3D5R4"
170 DRAW"BM222,100;F4D3G1L1D1L3U1E2U2H1D3G1U5G1D4H1L1E1U1D3F2L2"
180 DRAW"D1R5F2D5G2F1D1L9U1R8H1L5U1"
190 DRAW"H2U1E1L3BL2U1NL2BR2R3H1E2U1H2U3E4NH4R2E4BD16BL3ND2L4D5BR4H3R3"
200 DRAW"S8BM126,93;D5G8F2R1NF1BE1NR2U3R2BR2NR2D3E1F1U3BR2ND3R2D3BD2BL10R1F1R6E1R1E1R1E2H8U5L2"
210 GET(30,88)-(46,134),A, G
220 GET(210,88)-(226,134),B,G
230 GET(110,88)-(148,134),C,G
240 CIRCLE(70,161),8:PAINT(70,161),5,5
250 CIRCLE(186,33),8:PAINT(186,33),5,5
260 CLS:INPUT"1 OR 2 PLAYERS";C:IF C=1 THEN INPUT"DIFFICULTY (1-4)";D:IFD<1ORD>4THEN260
270 IFC>2ORC<1THEN 260
280 CLS:INPUT"JOYSTICKS (Y/N)";A$
290 LX=88:RX=88:SX=88:B=22:SL=0:SR=0:LC=0:RC=0
300 SCREEN1,1:IF A$<>"Y" THEN 400
310 A=JOYSTK(0):A=JOYSTK(3)
320 IF C=2 THEN B=JOYSTK(1)
330 IF A<21 THEN LU=-8
340 IF A>42 THEN LU=8
350 IF B<21 THENRU=-8
360 IF B>42THENRU=8
370 P2=PEEK(65280):IFP2=125ORP2=253THENSL=1:LQ=47:LZ=LX+25
380 IFC=2ANDP2=254ORP2=126THENSR=1:RQ=209:RZ=RX+25
390 GOSUB470:GOTO310
400 IF PEEK(339)=254THENLU=8
410 IF PEEK(339)=251THENLU=-8
420 IFC=2AND PEEK(338)=251THENRU=-8
430 IFC=2AND PEEK(341)=223THENRU=8
440 IF PEEK(345)=251 THENSL=1:LQ=47:LZ=LX+25
450 IF PEEK(345)=253THENSR=1:RQ=209:RZ=RX+25
460 GOSUB 470:GOTO400
470 IFC=2 AND RU GOSUB570
480 IF LU GOSUB550
490 IF C=1GOSUB 710
500 IF RND(10)=5 GOSUB680
510 IF LC>6AND RC>6 THEN CLS:PRINT"'DRAW.'":FORI=1TO500:NEXT:GOTO790
520 IF SL AND LC<7 GOSUB590:GOSUB590:GOSUB590
530 IF C=2 AND SR AND RC<7GOSUB630:GOSUB630:GOSUB630
540 RETURN
550 IF LX+LU<0 OR LX+LU>148 THEN RETURN
560 LX=LX+LU:PUT(30,LX)-(46,LX+46),A,PSET:LU=0:RETURN
570 IFRX+RU<0ORRX+RU>148THENRETURN
580 RX=RX+RU:PUT(210,RX)-(226,RX+46),B,PSET:RU=0:RETURN
590 IF SL=0 THEN RETURN ELSEIF LQ+20>256ORPPOINT(LQ+20,LZ)ORLQ+20>110AND LZ>SX+4 AND LZ<SX+41 THEN PLAY"D":SL=0:LC=LC+1:RETURN
600 LINE(LQ,LZ)-(LQ+20,LZ),PSET:LINE(LQ,LZ)-(LQ+20,LZ),PRESET
610 LQ=LQ+20:IF LQ>209AND LZ>RX+12 AND LZ<RX+34THENPLAY"AEGCFFED":FORI=1TO10:PUT(210,RX+I)-(227,RX+46+I),B,PSET:PLAY"CFDE":NEXT:W$="LEFT":GOTO780
620 RETURN
630 IFSR=0 THEN RETURN ELSEIFRQ-20<0OR RQ-20<148AND RZ<SX+41 AND RZ>SX+4THEN PLAY"F":SR=0:RC=RC+1:RETURN
640 IF PPOINT(RQ-20,RZ)THEN PLAY"F":SR=0:RC=RC+1:RETURN
650 LINE(RQ,RZ)-(RQ-20,RZ),PSET:LINE(RQ,RZ)-(RQ-20,RZ),PRESET
660 RQ=RQ-20:IFRQ<47AND RZ>LX+12 AND RZ<LX+34 THENPLAY"DEFFCGEA":FORI=1TO10:PUT(30,LX+I)-(47,LX+46+I),A,PSET:PLAY"FCD":NEXT:W$="RIGHT":GOTO780
670 RETURN
680 SU=5*(2-RND(3)):IFSU=0GOTO680
690 IF SX+SU<30OR SX+SU>133 THENRETURN
700 SX=SX+SU:PUT(110,SX)-(148,SX+46),C,PSET:RETURN
710 IF LX<RX THEN RX=RX-D*2 ELSE IF LX>RX THEN RX=RX+D*2
720 IF RX<0 THEN RX=0 ELSE IF RX>148 THEN RX=148
730 GOSUB 580
740 IFSS AND RX+25>LX+8 AND RX+25<LX+26 THEN SS=0:SR=1:RQ=209:RZ=RX+25
750 IF SS=0 THEN FORI=1TO O:GOSUB630:NEXT
760 IF SR=0 THEN SS=1
770 RETURN
780 CLS:PRINTW$"HAND PLAYER WON.":FORI=1TO1000:NEXT
790 CLS:PRINT"PLAY AGAIN (Y/N)"
800 A$=INKEY$:IF A$="Y" THEN 130 ELSE IF A$="N"THEN CLS:PRINT"BYE.":END
810 GOTO800
</code>

===== SPEEDING UP =====
Add the following lines at the top to disable BREAK key checking and switch the SAM into high-speed mode:
<code qbasic>
1 IF PEEK(&H3EB9)<>&H32 THEN CLEAR200,&H3EB0:FOR I=&H82B9 TO &H831E:POKE I-&H4400,PEEK(I):NEXT ELSE 6
2 FORI=0TO2:POKE &H3EBD+I,18:NEXT:I=&H3F1E
3 POKE I,&H26:POKE I+1,3:POKE I+2,&H7E:POKE I+3,&H83:POKE I+4,&H22:POKE I+5,&H7E
4 POKE I+6,&HA4:POKE I+7,&H4C
5 POKE &H019A,&H39:POKE &H019B,&H3E:POKE &H019C,&HB9:POKE &H019A,&H7E
6 POKE 65495,0
</code>

And add the following to the end of line 800 to restore normal speed on exit:
<code qbasic>
... :POKE65494,0:END
</code>
===== RUNNING IN EMULATORS =====
You can type-in and run the BASIC directly from command line with XRoar:
<code bash>
$ xroar -machine cocous SPACDUEL.BAS
</code>

You can create a virtual floppy disk to load and run from in MAME:
<code bash>
$ decb dskini SPACDUEL.DSK
$ decb copy SPACDUEL.BAS SPACDUEL.DSK,SPACDUEL.BAS -t
$ mame cocoe -ramsize 16K -window -resolution 1920x1080 -skip_gameinfo -flop1 SPACDUEL.DSK
RUN"SPACDUEL
</code>
 
Requires a cocoe.zip ROM pack in ${HOME}/mame/roms and the [[https://sourceforge.net/p/toolshed/wiki/Documentation/|Toolshed]] utilities to build the DECB disk image.

===== RTS =====
Return to [[:Tandy Color Computer:TRS-80 Colour Computer Space Adventures]] :: [[:Tandy Color Computer:]]