Commodore 128D - Page 329

f
! \
PEEK
; \
length (range 0-255) of the string, or if the length value is zero, then
MID$ returns a null string value. If the length argument is left out, all
characters to the right of the starting position are returned.
EXAMPLE:
PRINT MID$rCOMMODORE 128",3,5)
MMODO
MID$ (string, starting position [,length]) = substring
MID$ can also be used on the left side of an equals sign, to place
characters into a string. In this mode characters are copied from the
beginning of the substring to the string starting at the starting posi
tion. New characters replace old characters in the string. The num
ber of characters copied is indicated by length. Length cannot be
longer than the number of characters in the substring. If there are
more characters to copy than would fit into the string, the extras are
ignored. The string will always be the same length before and after
this operation.
EXAMPLE:
A$ = "123456789"
MID$ (A$,3,4) = "ABCDEF"
PRINT A$
12ABCD789
—Return contents of a specified memory location
PEEK(X)
This function returns the contents of memory location X, where X is
located in the range 0 to 65535, returning a result between 0 and
255. This is the counterpart of the POKE statement. The data will be
returned from the bank selected by the most recent BANK com
mand. See the BANK command.
EXAMPLE:
10 BANK 15:VIC = DECf'DOOO")
20 FOR I = 0 TO 48
30 PRINT PEEK(VIC + I)
40 NEXT
This example displays the contents of the registers of the VIC chip.
321
BASIC 7.0 ENCYCLOPEDIA-Basic Functions