🚀 go-pugleaf

Robert Andrew Ryan <rr2b+@andrew.cmu.edu> writes:
> I seem to remember reading a post here maybe a year ago about the chip
> driving the serial line having only a 1 character buffer, but that it
> was pin compatible with one with a 16 character buffer.  Or was that
> about the 4 port serial card?

The UART chip with the 16 character buffer is the NS16450.  The two 4
port serial cards I have all have these chips.  I don't know what the
1 character buffer UART chip number is, but I wasn't able to find any
NS16450's on the visible side of the tower model motherboard.

I run SLIP at 19.2kbaud, but I use a different type of SLIP server
than the annex.  Even using the NS16450, I get lots of overruns and
dropped characters.  Occasionally the serial driver just stops sending
out characters.  I modified the serial driver to not notify me about
overruns and to trigger at 4 characters (instead of 14), but it's
still losing.

I wasn't able to find any obvious problems with the serial driver's
code, so I suspect the machine is taking an inordinate amount of time
servicing higher-priority interrupts.  Then again, I have no real
information about what is going on.

In general, I'd have to say the RT makes a poor SLIP server.

				_.John