If what you want is to use a tape recorder to load programs from tape,
I'm affraid you can't do that. The Apple //c just doesn't have the
hardware needed to read data from a tape. And not, the modem port (an
standard RS-232 port) can't be interfaced without some electronics to a
tape recorder, and even then, it wouldn't be of any use to read/write
standard tapes.
But if you want to *save* binary data or Integer Basic programs to a
tape, there's a chance. In the past, I've been able to modify the
Integer Basic ROM image contained in the DOS 3.3 System Master in order
to redirect the tape save routine's output to port $C030 (speaker out)
instead to the default port $C020 (tape out). As the //c has a headphone
jack, all you have to do is to connect a cable between it and the tape
recorder's "mic" input, probably putting a voltage divider in between
(the //c's sound output level is suitable for a pair of headphones or
small speakers, and is way too strong for a microphone input). To patch
the ROM image, you have to search the tape save routine manually for all
$20 values that can be interpreted as a memory address ($20 is also the
opcode of the JSR instruction, so be carefull!), and replace them with
the $30 value. IIRC, most, if not all, of them are in BIT instructions
with absolute addressing mode (i.e., BIT $C020). The Monitor's
disassembler ir your friend here :-) .
This procedure will work with a //c+, but if this is your case, you will
have to take the sound signal from the DB-15 video expansion port, as
the //c+ doesn't have a headphone out. It should also work [unmodified]
with the //gs (which, as the //c, doesn't have cassette ports but has a
sound out port).
Greetings,
Antonio Rodríguez (Grijan)
<ftp://grijan.cjb.net:21000/>
George Parada escribió:
Hi,
How can I connect tape recorder to be used with Apple IIc.
I have read about this being done using modem port.
Any help is greatly appreciated.
George
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