21 Nov
2014
21 Nov
'14
11:46 a.m.
On Thu, Nov 20, 2014 at 10:55 PM, Cory Smelosky <b4(a)gewt.net> wrote:
Well, 2.10 has SLIP,
SLIP means you still need the IP stack
(serial-line-ip)
. It
just replaces an ethernet driver with a serial port.
but it'd certainly be easier to implement a
simple userland tool to talk
to a frontend!
Actually there was tool that was almost all in userland to support
multiple sessions over single serial line between a Macs a UNIX system. My
memory is that it used Chesson's multiplexer (mpx) which is part of stock
V7 (his is pre-select system call). I wish I could remember the name of
that program. But I bet it or something like it could be repurposed pretty
quickly to talk to a frontend micro.
Biggest issue is interrupt overhead on serial ports on the 11. If this is
real HW, see you can find a real DEC DH or better yet - an Able DH/DM. DH
style interfaces will be a huge difference over DL's or DZs. DZs were pigs
on Vaxen and on an 11 a line at 19.2K continuous could kill it.
BTW: I thought of another option. It's not telnet or ftp, but if your
desire is move files back and forth without having to use a common physical
media and sneaker-net, BSD 2x should have the BerkNET code in it. That
will run on an serial line - although my previous comment about the type of
interface can matter from a performance standpoint.
Clem