IMC-2001 Documentation
Operation Manual
“Operation Manual for IMC-2001, version 2.01”:
The complete scanned manual (also on archive.org, see https://archive.org/details/manual_imc_2001_2.01)
Super Serial Card
I got a super serial card from Ebay, the documentation of it can be found here https://archive.org/details/Apple_II_Super_Serial_Card_1981_Apple.