Programs for 2023 10Liner BASIC Contest

I have created three programs for the BASIC 10-Liner contest using Micro Color BASIC for the TRS-80 Micro Color Computer aka the MC-10.

SMASHUP (for PUR-120)

This program is a simple simulation of a smashup derby. You are the green car. The aim of the game is to hit the other cars.  Unless you are willing to risk driving head-on in the hope that your move/turn is timed as the last before the two colour blocks connect, the best strategy is to try to hit the other colours from the side as they pass in front of you.  this takes good timing.  If your timing is off and you drive in front of the oncoming colour block, then it hits you and you lose a life. 3 hits and you're out.  But if you hit the other car you get a point.  There is a time limit.  Your score is the number of hits achieved within the time limit.  A high score is displayed and you can then choose to play again.

Movement Keys: AWSD

VOLCANO (for Extreme-256)

This program involves flying your helicopter over a erupting volcano to retrieve a trapped person "Y" on the other side of the volcano.  Avoid the rocks flying out of the volcano. You can only take 3 hits, then you are dead.  Land on top of the victim to collect them.  When you do so, another person will appear on the other side of the island.  You must fly back and retrieve them. Continue to collect as many people as you can.  You must be careful when landing. The ground will not stop your descent. You must land gently and not simply hit the ground relying it to stop your descent.  How many people can you save before your craft reaches its limit?  Lives are printed in the bottom right.  Your score will be printed next to your helicopter after your last hit.

Movement Keys:  WASZ

Each game can be played here: https://archive.org/details/@james_gerrie

Here are the program listings:

SMASHUP

0 DIMT,L(8),D(8),V(8),C(8),R,I,J,K(255),H,Q,V,M:V(1)=-1:V(2)=-33:V(3)=-32:V(4)=-31:V(5)=1:V(6)=33:V(7)=32:V(8)=31:GOTO7
1 SOUND100,1:S=S+1:PRINT@480,"SC"S"HI"HI;:ON-(S<HI)GOTO5:HI=S:PRINT@480,"SC"S"HI"HI;:GOTO5
2 POKE49151,64:POKEL(T),134:L=L-1:PRINT@496,"LIVES"L;:POKEL(T),137:SOUND1,1:ON-(L>.)GOTO5:GOTO6
3 Q=2:FORV=1TO350:FORT=.TO7:IFPEEK(L(T)+V(D(T)))=.THEND(T)=RND(8):GOTO5
4 POKEL(T),H:L(T)=L(T)+V(D(T)):I=PEEK(L(T)):IFI>HTHENIFT=.ORI=RTHENON-(T=.)GOTO1:GOTO2
5 POKEL(T),C(T):NEXT:D(.)=K(PEEK(Q)ANDPEEK(J)):NEXT
6 FORT=1TO10:SOUND99,1:NEXT:PRINT@496,"TRY AGAIN?";:FORI=0TO1STEP0:Q=ASC(INKEY$+CHR$(0)):I=-(Q=89ORQ=78):NEXT
7 CLS:PRINT@452,"smash up! BY JIM GERRIE":V=32:H=128:I=16:J=17023:R=143:K(65)=1:K(68)=5:K(87)=3:K(83)=7:S=0:POKE16925,0
8 POKE16926,1:M=16384:FORT=MTOM+479:POKET,.:NEXT:FORT=1TO13:?@V*T+1,"€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€";:NEXT
9 FORT=0TO7:D(T)=RND(8):C(T)=R+T*I:NEXT:FORT=0TO7:L(T)=M+261+3*T:POKEL(T),C(T):NEXT:L=4:ON-(Q<>78)GOTO3:END
10 REM                                                                                             1         1         1
11 REM   1         2         3         4         5         6         7         8         9         0         1         2
12 REM789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890
13 REM smash up! JIM GERRIE
14 REM 2023 10-LINER CONTEST
15 REM USE: W
16 REM    A S D
17 REM YOU ARE THE GREEN CAR.
18 REM SMASH INTO THE OTHER
19 REM CARS, BUT DON'T LET
20 REM THEM SMASH INTO YOU.
21 REM THERE IS A TIME LIMIT.

VOLCANO

0 CLEAR500:CLS:T=0:A=28:B=12:M=16384:FORT=1TO192:S$=S$+"":NEXT:D=1:V=32:G=17023:L=V*B+A:N=L+M:Z=RND(3):J=48+4:X=60:E=3:W=2

1 C$(1)="‚‡":C$(3)="‹":D$(1)="€‰":D$(3)="†€":Z(1)=16801:Z(2)=16651:Z(3)=16742:J=J-1:POKEM+511,J:SOUND1,2:IFJ<49THEN?S:END

2 ?@.,S$"Ž•ŸšŽÑߟßҍŽÑ¿¿Ÿ¿¿„ˆÓÓÓ¿¿";

3 ?"¿Ÿ¿¿¿Òˆ×¿¿¿¿¿¿Ÿ¿¿¿¿ÓŒˆ×¿¿¿ÿÿÿÿŸÿÿÿ¿¿Û„ŒˆÓÓ׿¿ÿÿÿÿŸŸŸŸŸÿÿ¿¿¿»Ò";

4 ?"ˆ×¿¿¿¿ÿÿÿÿŸŸŸŸŸŸŸÿÿÿÿ¿»„ÓÓÓÓ׿¿¿ÿÿÿÿÿŸŸŸŸŸŸŸŸŸÿÿÿÿ¿»£¢£¡¿¿¿¿¿¿¿ÿÿÿÿÿŸŸŸŸŸŸŸŸŸŸŸÿÿÿÿ¿¿ª¯";:POKEZ(Z),89

5 FORT=1TO5:X(T)=X(T)+A(T):Y(T)=Y(T)+B(T):IFX(T)<.THENX(T)=.

6 IFX(T)<EORX(T)>XORY(T)<2ORPOINT(X(T),Y(T))<>1THENX(T)=33+RND(8):Y(T)=8+RND(E):A(T)=W-RND(E)*(1+RND(.)):B(T)=W-RND(E)*1.5

7 RESET(X(T),Y(T)):NEXT:P=PEEK(N)+PEEK(N+1)+PEEK(N+V)+PEEK(N+33):C$(W)=C$(W+D):D$(W)=D$(W+D):?@L,C$(W);:?@L+V,D$(W);

8 K=PEEK(W)ANDPEEK(G):D=(K=65ANDA>.)-(K=83ANDA<30):A=A+D:B=B+(K=87ANDB>.)-(K=90ANDB<30):L=V*B+A:N=L+M:IFP=572THEN2

9 ON-(P<>518)GOTO1:Z=RND(E):S=S+1:?@.,"SCORE"S:SOUND99,1:FORT=1TO2000:NEXT:Z=.:Z(0)=16829:ON(1ANDS)GOTO2:Z=RND(E):GOTO2

10 REM                                                                                             1         1         1        

11 REM   1         2         3         4         5         6         7         8         9         0         1         2        

12 REM78901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678

13 REM VOLCANO RESCUE

14 REM BY J.GERRIE

15 REM 10LINER CONTEST 2023

Both programs use PEEK and POKES to place the player objects on the screen and to check for collisions between objects.  Key sensing is also achieved using PEEKs for speed and for continuous input sensing rather than the single key press sensing of INKEY$.

Volcano uses a large number of PRINT statements with the graphic of the volcano to refresh the screen.  It also uses the RESET command (line 7) of Micro Color BASIC to plot the exploding debris from the volcano.  The POINT command is used to determine if a RESET space is clear.

In both programs ON-(A=B)GOTO2 constructs are used instead of IFA=BTHEN2 to allow for multiple  branches to be packed onto a single line.  For example see the end of line 9 in Smashup.

ERII (for SHAU category)

This program simply presents a memorial image of her Majesty Queen Elizbeth the Second. It uses a special screen mode of the MC-10 to get 9 colours rather than the regular 8.  One of those colours works better as a skin tone. This program is for the SHAU category.

0 CLS1:DIMC1,C2,M$,M:M=16384:GOTO2

1 C1=(PEEK(17024)AND1)*256+PEEK(17025)-1+M:FORC2=1TOLEN(M$):C3=ASC(MID$(M$,C2)):POKEC1+C2,C3-(C3AND64):NEXT:?@C1-M+C2,:RETURN

2 PRINT"¯¯Ÿ¯£    £¯¯¯¯¯­Ÿ¯¯¯¯¯¯¯¯¯¯¯®¯¯«¯¯¬¬¬¬¬¬¬­¯¯§¯";

3 PRINT"ß߯¯¯¯¯¯¯¯¯¯¯ßßߏßßßß ßß    ß߀ßߏß߀   Ï€    Ï€€ß";

4 PRINT"ß€   ÿÿ    ÿÿ€Ï€          €€       ÿ  €";

5 PRINT"€  ÿ       €€  ÿ ¿¿¿¿  €€    ¿¿¿¿  €";

6 PRINT"€  €      €€Ï      €€¯Ï €€€€";

7 PRINT"€¯¯ÏÀ";:POKE49151,64:PRINT@32*7+22,;:M$="GOD BLESS":GOSUB1:PRINT@32*8+22,"elizabeth";

8 PRINT@32*9+22,;:M$="    II   ":GOSUB1:PRINT@32*10+22,;:M$="1926-2022":GOSUB1

9 M$=INKEY$:ON-(M$<>CHR$(13))GOTO9:CLS0:SOUND1,1:CLS:END

10 REM                                                                                             1         1         1        

11 REM   1         2         3         4         5         6         7         8         9         0         1         2        

12 REM78901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678

13 REM ELIZABETH REGINA II

14 REM BY J.GERRIE

15 REM 10LINER CONTEST 2023