Tape Backup

Here is a program from Larry Kenny of Larken Electronics to backup any 2068 program. The program requires two tape recorders, one to play the tape, and one to record the program. The program can be located anywhere in free memory. Follow the instructions as given in the program. Once the code 1s set, it can be SAVEd and LOADed separately and called by RAND USR x, where x is the starting point of the code. Here is the machine code listing:

 0010 ORG 60000
 0020 ENT
 0030 start IN A, 254
 0040       RRA
 0050       RRA
 0060       RRA
 0070       JR NC,exit
 0080       BIT 3,A
 0090       JR Z,zero
 0100       OR 4
 0110 zero  OUT 254,A
 0120       JR start
 0130 exit  EI
 0140 RET

    1 REM Tape to Tape backup program using 2 tape recorders
   10 CLEAR 60000
   20 FOR a=60000 to 60019
   25 READ X: POKE a,X
   30 NEXT a: CLS
   40 PRINT "  This Program is for making     tape to tape copies using the     2068 as a signal reconditioner": PRINT
   50 PRINT "  Using 2 tape recorder's, play the origiional tape into the       input of the 2068(ear) and       record your backup tape from     the output of the 2068(mic).      Adjust the play volume so the   border doesn't flick to much on   the silent periods of the tape."
   60 PRINT: PRINT " Rewind both tape recorders and start them both at the same time",," Type 3 to stop"
   70 RANDOMIZE USR 60000
  100 DATA 243,219,254,31,31,31,48,10,203,95,40,2,246,4,211,254,24,239,251,201