ross@teraflop.com said:
> Sigh, every *$#&* Miata is a little bit different.

So it it perhaps helpful if I tell what happens on my box:

NetBSD 1.3H (GENERIC) #16: Tue Oct 20 16:49:51 PDT 1998
    ross@iota.teraflop.com:/usr/src/sys/arch/alpha/compile/GENERIC
Digital Personal WorkStation 500au, 500MHz
[...]
cia0 at mainbus0: DECchip 2117x Core Logic Chipset (Pyxis), pass 1
cia0: extended capabilities: 1<BWEN>
cia0: using BWX for PCI config access
[...]
sio0 at pci0 dev 7 function 0: Contaq Microsystems 82C693 PCI-ISA Bridge (rev. 
0x00)
[...]
com0 at isa0 port 0x3f8-0x3ff irq 4: ns16550a, working fifo
com0: console
com1 at isa0 port 0x2f8-0x2ff irq 3: ns16550a, working fifo
alpha_shared_intr_establish: isa irq 3: warning: using edge-triggered on 
level-triggered
[...]

This seems harmless, and NetBSD runs well... as long as I
use a serial console.
The graphics console does only show garbage, and the machine
resets at some point. I don't know yet whether there are problems
with byte/word access, or my graphics board
> Cirrus Logic CL-GD5430 (VGA display, revision 0x47) at pci0 dev 11 function 0
> Intergraph product 0x00e4 (miscellaneous display, revision 0x60) at pci0 dev 12 function 0
(4D50T) needs special handling.
(Will try a plain VGA board when I have time.)

Is there documentation for the Pyxis chipset available?

best regards
Matthias