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When the IBM-PC BASIC interpreter sends hex code OD (carriage return)
it adds an extra hex OA (line feed). Hex code 1A (end-of-file) also gets
special treatment: the interpreter does not send it at all. This can cause
problems that generate graphics or download character data, but there is a
solution. Try changing line 20 in the preceding program and adding the
coding shown below.
Coding for IBM-PC with monochrome display:
20 GOSUB 100
100
O=INP(&H379)
:IF
0<128
THEN 100
110
OUT &H378,1
:OUT &H37A, 5
:OUT &H37A,4
120
RETURN
Coding for IBM-PC with color adapter:
20 GOSUB 100
100
O=INP(&H3BD)
:IF
0<128
THEN 100
110
OUT &H3BC,I
:OUT &H3BE, 5
:OUT &H3BE, 4
120
RETURN
27
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