> [W]hen I run edlable /dev/rsd0c it comes back with "/dev/resd0c:
> Device not configured".

> Any ideas why this is happening?

The kernel is not finding any SCSI interfaces.  Note the lack of any
scsibus reports:

> mainbus0 (root)
> obio0 at mainbus0
> zsc0 at obio0 addr 0x0 level 6 (softpri 3)
> kbd0 at zsc0 channel 0
> ms0 at zsc0 channel 1
> zsc1 at obio0 addr 0x20000 level 6 (softpri 3)
> zstty0 at zsc1 channel 0 (console)
> zstty1 at zsc1 channel 1
> eeprom0 at obio0 addr 0x40000
> clock0 at obio0 addr 0x60000 level 5
> memerr0 at obio0 addr 0x80000 (ECC memory)
> intreg0 at obio0 addr 0xa0000
> ie0 at obio0 addr 0xc0000 level 3 hwaddr 08:00:20:01:78:72
> obmem0 at mainbus0
> vmes0 at mainbus0
> si_vmes_match: May be an `sc' board at pa=0xff200000

This is almost certainly the problem: you quite likely do have an sc.
NetBSD does not currently support the sc, only the si.  I have some
fragments of support implemented, but am stalled for two reasons: (1)
my machine with an sc is currently not in a usable state because the
monitor for its display died, and (2) I've seen weird misbehavior I
have no handle on - different devices seem to fail in grossly different
ways.  If you have a sun3 development environment on another machine, I
will be happy to give you the fragmentary driver I have.  It surely
needs work, as the last time I did anything with it was pre-1.3.

					der Mouse

			       mouse@rodents.montreal.qc.ca
		     7D C8 61 52 5D E7 2D 39  4E F1 31 3E E8 B3 27 4B