Recovering Cassette Tape Records
grant at stockly.com
Tue Jan 2 16:26:47 CST 2007
>If it's any use to you, I can send some tools to work with this type of
>data (change record size, load address, convert to binary, set fill
>values etc.). I can also give you assembler/disassemblers which will
>work with MHX directly.
That would be great! Just send it to my list address. I have no size limit.
>PS: I'd like to get a copy of the data once you get it extracted.
I have a memory dump of basic loaded and unitialized from 0000-1FFF, but I
want the original data extracted off the tape.
I hooked a 232 transciever and inverter up to the demodulated output from
the KCACR (right at the 1013 ACIA IC) and it wasn't 300bps. I had a 2.5ms
bit clock and it should have been around 3.3ms.
I am going crazy to the point of completely ignoring the following fact. I
have 7-8 WAV files on my computer. I started recording the second I pushed
play, which was right at the beginning of the tape. I stopped recording
when it lost the carrier.
I have 3 recordings that are 13:30 minutes long and 3-4 that are 10:17
long. The KCACR will load basic with either length, although at 13:30
minutes it is very sensitive to tape quality it seems.
I have a very nice tape deck with dc servo controlled motors. This is very
disapointing to me. It makes me cry to think about it... : ( I want a
perfect quality recording of the tape and it kills me to think I have to
hook one of my "junk" players up to the computer to get it...
I think the reason that the demodulated output is not 300bps is the KCACR
is locking onto the tape speed? The KCACR is supposed to handle a +-20%
speed variance. The bitclock must be provided to the 1013 ACIA. I don't
have the manual for the KCACR yet, so I have no idea...
My idea to get a PERFECT MITS basic sound file is to recover the S records
and generate a new sound file using the KCS.EXE program found on the web.
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