J Worgan escribió:
If I save to a cassete recorder, I can then take the cassette recording and
burn it to a CD, right?
Right, but it would add some background noise, making the recording less
reliable. If you can plug the Apple directly into the device used to
record the CD, you would obtain a totally clean and exact copy of the
data. You can do this by pugging the Apple into a PC microphone input,
or into a Hi-Fi amplifier that has a "phono" (record player) input
(record players output signals at a level comparable to thoes of a
microphone).
Also, I have seen that MSX users have done PC utilities able to convert
tape data back into binary form, and to re-encode that data into audio
signals suitable of recording into a tape/CD or sending to a computer's
cassette input. These utilities basically take raw PCM data from the
PC's sound card and demodulate it into the original data, or take data
and modulate it into PCM audio before sending that via the sound card.
This allows MSX users to have collections of tiny tape images (perhaps
only 16-32 kb for each tape) and send them to the 8-bit computer just by
running a "player" utility on the PC. I'm sure this can be done with
Apple tapes. It would be a great way of both preserving those old tapes,
and creating image files suitable of loading into an emulator.
For the IIc and IIGS
Can data and programs be sent via modem to microphone input and recorded on
a cassette or reel to reel tape recorder?
Then loaded through modem input from the cassette or reel to reel tape
recorder output?
No, it wouldn't work at all. A modem does basically the same thing as
the built-in cassette port electronics on a ][ (transforming digital
data into an analogue signal and back). BUT it does that on a completely
different (and incompatible) way. You can not use a modem to decode tape
data.
One thing that can be done is to load the Integer Basic ROM into a IIc's
or IIgs' "language card" area (the upper 16 kb of RAM) and patch it so
the cassette output routines write to address $C030 (speaker port)
instead to $C020 (cassette output port). Then, with a simple voltage
divisor, you would be able to attach a cassette recorder to the
computer's sound output and use that to record data TO cassette. I know
it can be done because I have succeed in it!
Anyway, I'm not sure of why it would be of any use loading old cassette
software into a IIc or IIgs: most of these programs (if not all) are
written in Integer Basic, which in a IIc and a IIgs requires you to boot
DOS 3.3 and load the Integer Basic ROM image from a 5.25" disk. And once
you have DOS, it is more convenient to use it than the old tape-based
storage. It should be easier to convert those tapes into disk-based
files if you want to use them with a IIc or a IIgs.
Greetings,
Antonio Rodríguez (Grijan)
<ftp://grijan.cjb.net:21000/>
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