Before my Config was:

1.1A Generic #2 Feb 13
Mac IIsi
9 MB   (Using simm doublers)
500 MB External HD

and working fine.
-----------------------------------

Now my config is:
1.1A Generic #2 Feb 13
Mac IIsi
5 MB    
500 MB External HD
Apple Thick/Thin Ethernet Card (DSP8390)

I can't boot into single user mode.

.
.
.
.
nubus0: slot 9:Ethernet card (Vendor:Apple Computer/3Comm, Part:Et-1234) 
not configured
.
.
.

I get as far as:

PRAM 0x3161cc0e, macos_boottime:0x3161cc02

Then just sits there.....

Thanks
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