Fre - AMSTRAD cpc 6128 User Instruction

FRAME
FRAME
10 MODE 0
20 PRINT "FRAME off"
30 TAG
40 MOVE 0,200
50 FOR x=0 TO 500 STEP 4
60 IF f=1 THEN FRAME
70 MOVE x,200
80 PRINT" ";CHR$(143);
90 NEXT
100 IF f
=
1 THEN RUN
110 C LS
120 TAGOFF
130 PRINT "FRAME on"
140 f=1
150 GOTO 30
run
COMMAND: Synchronises the writing of graphics on the screen, with the frame
flyback of the display. The overall effect of this is that character or graphics
movement on the screen will appear to be smoother, without 'flickering' or 'tearing'.
Associated keywords: TAG, TAG 0 F F
FRE
F R E ( <numeric expression> )
F RE ( <string expression> )
PRINT FRE(0)
PRINT FRE("")
FUNCTION: Establishes how much FREe memory remains unused by BASIC. The
form F R E ( " ") forces a 'garbage collection' before returning a value for available
space.
NOTE - BASIC uses only the first 64K of the memory.
Associated keywords: H I M EM, M EM 0 R Y
Complete List of Keywords Chapter 3 Page 29