Thank you for the info !
George
On 5-Aug-05, at 9:13 PM, Antonio Rodríguez wrote:
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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