the serially transferred files are duds.
Apparently pip decided to translate tabs to spaces.... even in binaries, even in binary mode.
On that note... cpmtools seems to work with the disk image when using the kpiv format.
Only one hiccup (besides discovering the tab to space conversion)... a large text file ends with a bunch of 0x1a's... (ascii substitute?) Dunno why, but doubtful they belong there.