Commodore Plus 4 - Page 169

PEEK(X)
This function gives the contents of memory location X, where X is
located in the range of 0 to 65535, returning a result from 0 to 255.
This is often used in conjunction with the POKE slatement.
RCLR(N)
Returns current color assigned to source N (0 < N < 4}
(0= background, 1 = foreground, 2 = multicolor 1,3= multicolor
2,4 = border).
RDOT(N)
Returns information about the current position of the pixel cursor (PC)
at XPOS/YPOS.
N - 0 for XPOS
1 for YPOS
2 color source
RGR(X)
Returns current graphic mode (X is a dummy argument).
RLUM(N)
Returns current luminance level assigned to source N
RND{X) (random number)
This function returns a random number between 0 and 1. This is useful
— in games, to simulate dice rolls and other elements of chance, and is
also used in some statistical applications. The first random number
should be generated by the formula RND(-TI), to start things off dif
ferently every time. After (his, the number in X should be a 1, or any
positive number. {X represents the seed, or what the RaNDom number
is based on.) If X is zero, RND is re-seeded from the hardware clock
every time RND is used- A negative value for X seeds the random
— number generator using X and gives a random number sequence. The
use of the same negative number for X as a seed results in the same
sequence of random numbers. A positive value gives random numbers
based on the previous seed.
To simulate the rolling of a die, use the formula INT{RND(1)*6+1). First
the random number from 0-1 is multiplied by 6, which expands the
range to 0-6 (actually, greater than zero and less then six). Then 1 is
added, making the range 1 to under 7. The INT function chops off all
the decimal places, leaving the result as a digit from 1 to 6.
To simulate 2 dice, add two of the numbers obtained by the above for
mula together.
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