🚀 go-pugleaf

I just upgraded my pc's serial card to 16550A's and I've been having
problems with Mach (mk77 ux37).  Mouse access from them seem fine, but
if I send any character to a serial port via getty, kermit, or even
cat, the system locks up tight - so tight it won't even enter the
debugger.

If I disable the fifo right after I test if it's there, (in
mk/kernel/i386at/com.c) then everything works fine, but of course this
defeats the whole purpose of the upgrade.

Has anyone run into a similar problem or have any suggestions as to
how I can track this down?

-Ralph

ps: I tested the fifo capabilities with OS/2 and 2.6MSD; it seems to
    work fine.

===============
Ralph Valentino   (ralf@chpc.org)  (ralf@wpi.wpi.edu)
Hardware Engineer,  Worcester  Polytechnic  Institute
Center for High Performance Computing, Marlborough MA