🚀 go-pugleaf

We have a MC5500 running v. 3.0A of the OS, with a EXOS 201 Ethernet
controller.  The controller netcode handles essentially all of the
TCP-level stuff.  On file transfers from another machine to the
Masscomp, things go fine for a bit, but then start to hang up, with only
one packet getting through every 30-90 seconds.  This also occasionally
occurs in telnet; one must send a packet (keystroke) in order for the
other host to continue sending data (or wait till it retries).

Using a netwatch program, it seems that the proper acknowledgement
packet is getting screwed up or not sent.  It seems it only occurs when
a separate packet is required for the acknowledgement, and then only
occasionally, in spurts.  We suspect the netcode or controller hardware.
Are there any known patches we can try?  We are not under service
contract, but we can patch the netcode using the MS-DOS debugger on our
PC.  Any help would be greatly appreciated.

The firmware is Release 5.0 and the netcode is Release 2.0 with one
patch we did to remove a TTL_EXCEEDED problem.

Marty Ryba (slave physics grad student)
They don't care if I exist, let alone what my opinions are!
marty@puppsr.princeton.edu or mfryba@phoenix.princeton.edu

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