titus-larsen-titus-1981-apple-interfacing

each decade. The bed code is used in many electronic devices,
is used to control seven-segment displays and other decimally
devices.
We would like you. to try and write a program that will "split" a
into its bed equivalents. The output port will be used to
the different groups, two bed digits at a time. The ten's and
digits should be displayed at the output port first, followed
the thousand's and hundred's bed digits. You may use the REother
key to "stop" the computer between displays of
We used the following program:
10 IN PUT "VALU E "; A
20 IF A < 10000 TH EN 30 ELS E 10
30 GOSUB 1000
40 POKE 49 31 8, A+C
50 GET A$:A = B
60 GOSUB 1000
70 POKE 49 318, A+C
80 GOTO 10
1000 B = 0: C = 0
1010 IF A > 99 TH EN 1100
1020 IF A < 10 TH EN RETURN
1030 C = C + 16: A = A -10
1040 GO TO 1020
11 00 A = A-100: B = B+l
1110 GOTO 1010
In the subroutine, the variables are A, B, and C. In this case, the
A represents the decimal value to be converted to bed (the starting
value), B represents the "hundreds," while C represents the "tens."