TPDD
Manuals
Belt
Search goole or ebay for: "FRW-8.5 belt"
Cable
The real cable has some active components. (TODO, link to schematic of original cable) It's thought that today you could just use a cable like below, using schottke diodes specifically, and it's probably equally as good as the original cable which had transistors.
Simpler Cable that is claimed to work.
PC Utils
Python TPDD Client Use any modern machine/os to read/write/format disks in a TPDD drive.