I am getting an Ultra 5+ at work to replace my SPARCstation 20/71, now that
1.5 is out.  I'm a little confused about how Ultra 5+ console support works.

The INSTALL document says

Supported devices
[...]
	o  Serial devices
		- SBus Z8530 serial (zs)
[...]

Unsupported devices
[...]
	o  Serial devices
		- PCI based systems (sab)

If there's no keyboard & mouse support, no video support, and no "serial
devices" support for the (PCI) Ultra 5/10, how the heck do you install it?

Mike Cooper's excellent "sysinfo" returns the following on my officemate's
Ultra 5+ system:

[...]
    pci108e,a000(0) is a "Sun sabre" PCI
        simba0 is a "Sun PCI" PCI bus bridge
            ebus0 is a "Sun Microsystems PCI<->OnBoard" bus bridge
                auxio is a "Auxiliary I/O"
                power0
                se0 is a "Siemens 82532 ESCC" serial device
                su0 is a "82510/8250/16450/16550AF" serial device
                    kbd is a "Sun Type-5 US Unix" Keyboard
                su1 is a "82510/8250/16450/16550AF" serial device
		[...]

Is the serial port console on the "se0" device?  Which is supported in 1.5?

(What the heck is a "sab", anyway?)

I'm going to assume that I'll be installing 1.5 on an external 9 Gb SCSI disk
from Solaris (on the internal disk), but am wondering what's going to happen
after that, when I want to boot up into NetBSD.  (I'm on a SPARCserver 20 here
at home, running headless with a serial "zs" console that obviously works
fine, and am wondering if I can do the same with the Ultra 5+.)

Thanks in advance,

	- Greg