Depends: I wonder what programming tools/languages were present on the old PowerBook. Otherwise, getting any handwritten program or its associated tools/runtimes (if necessary) onto the laptop might be just as much of a challenge as getting audio data off.

CP/M was an OS for the 8080/Z80, which was limited to 64k of RAM.

None of the tools that you know today would work in something that small.

There was a C compiler for a dialect of C that met these constraints; I didn't have it, and I didn't know C at the time.

`cat file > /dev/com1`, or something like that.