Erdogan Tan - 20/03/2022
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init6 (an etc/init test version) is used to understand if
serial ports (tty8 and tty9) ready or not..

If sys stty and sys open system calls will return with error (*)
-that means serial port is not usable to login-; if so, 
serial ports (terminals, tty8 & tty9) can be bypassed
(by using ALT+127 keystroke) during etc/init multiuser & multiscreen
initialization phase.
 
Test version of the 'init' file helps to undersand about
this serial port -login- absence problem.

Retro UNIX 386 v1 can run in multiuser mode without failing
due to this error (*) if Bochs emulator is set with serial port(s).
But even if serial ports are not used in Bochs, kernel (still)
can continue to run in multiuser mode.

(Pressing Alt+127 keys during multi user, single user mode
selection prompt by /etc/init, prevents repetitive attempts
for giving login prompt to serial ports, tty8 and tty9.) 

Test version of etc/init can be replaced with normal etc/init file
by using 'unixcopy' program (runs on dos or 32 bit windows).
