Listing of file='FREQ.BAS;05' on disk='vmedia/ay-3-8910_programs-sector.ccvf'
10 REM *** SINGLE FREQUENCY GENERATOR *** 20 REM 30 REM THE CLOCK FREQUENCY FOR THE AY-3-8910 MUST BE 40 REM ENTERED. USUALLY 2.000 MHZ OR 1.78977 MHZ. 50 DF= 1.7897725E06 55 REM 60 INPUT "CLOCK FREQUENCY FOR AY-3-8910 : ";FC 70 IF FC< = 0THEN FC= DF 75 REM 80 OUT 48,7:OUT 49,62:REM CHANNEL 'A' ONLY 90 OUT 48,8:OUT 49,0:REM ZERO AMPLITUDE 100 INPUT "TONE FREQUENCY : ";FQ 105 IF FQ= 0 THEN END 110 TP = INT (FC/ (16* FQ)+ 0.5) 120 PH = INT (TP/ 256) 130 PL = TP- 256* PH 140 OUT 48,0:OUT 49,PL 150 OUT 48,1:OUT 49,PH 160 PRINT "HIGH BYTE = ";PH,"LOW BYTE = ";PL 170 OUT 48,8:OUT 49,15 180 INPUT "HIT <RETURN> TO STOP ";A$ 190 OUT 49,0 200 GOTO 100