> 
> >If you can compile test kernels, try removing the ZSWR15_DCD_IE from
> >dev/ser.c (around line 262, I think). This change is basically what I'd
> >do to "support" these printers (plus set the code up to use the external
> >input). If it stops hanging, we know what's wrong.
> 
> Bill,
> 
> I saw your request for someone to put a scope on the printer, but don't 
> have access to one so I couldn't help.  Building the test kernel was 
> something I could do though, and I can report it doesn't solve the 
> problem with the Energy Saving Apple Personal LaserWriter 300.  Still 
> hangs on boot trying to set ttyflags.

Bob,

Where did it hang before? I thought it always hung at boot?

I ask as it turns out that there are other bits of code which will
turn interrupts on, nulling the above change. Specifically, there's
stuff around line 1471 & 1472. Try deleting it too & see what happens.

Take care,

Bill