spectrum utility - OpenLibra

650-770
710
790
12
(ZX81 ARCADE GAMEl
designs a 900-995 Draws a 'gate' default value of address).
random, yet heralding each zero and so will LE/LNS Level of game
slightly structured new level of the have no effect. reached, lines
maze, with maze. The 'plus ones' reached.
'guaranteed path' 1000-2070 Initialise variables are added 1$ Riding-Indicators on
through any and print play because Sinclair Bar-graph. These
section. instructions. array subscripts travel back and forth
Chopper bar 2010 The scroll routine start at one, not on the end of the
sequence. A long (machine code) zero, and 'CODE Bar-graph as it
string is randomly scrolls from line INKEY$ will give moves.
sliced and printed 2 1 upwards. zero when no ADMAC Address of Machine
in different leaving lines 22 keys are pressed. Code routine.
positions to give and 23
the effect of
sequentially
moving bars.
3000-3080
stationary.
Adds a bit of life
to introduction
variables —
general
variables — Maze
construction
Ensures that screen by running
increasing layers ripples down BB Bank Balance. M$ Maze assembly
of choppers bars sides until player MIN) INKEY$ control string.
are printed as the is ready and (array) of Man PA Paths a, b and c, the
maze moves up. presses a key. Movement. PB 'guaranteed' clear
The split random 4000-4060 End-game display U$ Universal string, PC paths through the
number has the and option to play used to print mazes.
effect that very again. anything required for DE Deviation of diagonal
high or very low 7000-7080 Assigns values to next line of maze. path (PC)
bonuses are still elements of array X Player's position. J Horizontal 'joints'
possible but are 'M' that CH Character of man between maze
chosen less often correspond to the (£,$>. sections
than middle codes of the keys H Hit character i.e. T LOOP Number of maze
values to be used for character at player's sections before
(technically a man-movements. next intended screen chopper sequence.
Normal Any other keys, if position if it is not a LLOOP Number of lines in
probability
distribution
pressed will just
select elements SOS
clear space.
Start of screen F,C,V
one section.
Used for chopper
curve). that contain the (display file sequence.
CSREM -TONE GRABBER JhN
..DRUE,ROGER: HQGROGPROG).
_ T. izRROOL '5.
+ RUN 1000
7 REH MfiZEMOUE
10 LET B5 = B5-1
15 IF BB :CH = 12)
195 POKE X.CH+128
1 Q S R H N ~
500 REM" PATH-BENDING
£10 RETURN
520 LET PR=1~RND*PR
230 s_£T MS-RR TO PBJ = "
240 RETURN
250 lET M$I.J-L TO J+L+l) =
:50 RETURN
2 70 LET Ha:Pft
I" (L4L TO
2 TO PB - 1 • ='
!30 RETURN
300 REM HflXN-HRZE
310 FOR T =I TO 5
350
330 IF T = 1 OR T =4 THEN LET
M$ (6-fT TO i +H5
340 GOSUB 50
350 LET PR =4- + RND * 14
350 LET PB=PR+RND*3
370 LET PC =4-rRND*25
330 GOSUB 50
UL..
M $ =
ZX COMPUTING APRIL MAY 1985