> 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.
