14 Jul
2020
14 Jul
'20
11:02 a.m.
One oddity: The system came up but was faulting out on
ports tty1 and 2.
Editing /etc/inittab fixed that, but the system *does* have a two serial
port card expansion module. Wonder if the modules have
to be in specific
slots or something...
The UnixPC uses geographic addressing (like an Apple II, unlike an IBM PC),
so the I/O address of the hardware (Z8530 chip) is determined by the slot.
I thought the UnixPC kernel/drivers were smart enough to automatically
detect the serial card(s) in any slot, but it's been almost thirty years
since I dealt with that, so perhaps I'm misremembering.
The built-in serial port is one port of an NEC uPD7201 (or Intel 8274) at a
fixed address, so the driver for that should always be present.