Minimal tape emulation works now. Next problem:
I only get "cpio: Bad header - checksum error", "cpio: Not a cpio file, bad header." when using TOSEC tape zip file (UNIX System V Release 4 Amiga Version 2.03 Installation Tape (1991)(Commodore-Amiga)(A2500-A3000UX).zip) files.
Does anyone know if files inside zip are in original format? What is order of files in original tape?
EDIT:
http://amigaunix.com/ answered all my questions.