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- Newsgroups: comp.protocols.tcp-ip
- Path: sparky!uunet!noc.near.net!vaxeline.ftp.com!tunes!backman
- From: backman@ftp.com (Larry Backman)
- Subject: Re: Help wanted: Interlan Ethernet drivers
- Message-ID: <920728123820@tunes>
- Nntp-Software: PC/TCP NNTP
- Lines: 31
- Sender: root@vaxeline.ftp.com (vaxeline.ftp.com root account)
- Nntp-Posting-Host: tunes.ftp.com
- Organization: FTP Software, Inc., Wakefield, MA
- References: <1992Jul17.180609.11685@bostech.com> <241@warlord.UUCP> <1992Jul23.161641.12328@bostech.com> <242@warlord.UUCP>
- Date: Tue, 28 Jul 1992 12:38:20
-
- In article <242@warlord.UUCP> mhw@warlord.UUCP (Michael H. Warfield) writes:
-
- >> >As I said, still no unix. The only un-explored avenue was that one of
- >> >the NCM people said (or implied, or atleast I inferred) that the NP600
- >> >might work in NI6510 (?) mode, as a dumb card. That should not need
- >> >bus mastering, so I plan to check it out.
-
- The NP600A is an intelligent card with a 80186 CPU and a 85286 Ethernet chip.
- To talk to the net you need the 586. Your host CPU cannot reach that 586.
- The onboard 186 can make the 586 jump through hoops provided some code to drive
- the 186 is downloaded into the on-board RAM. the host talks to the card
- through a rather odd combination of program IO, shared memory, and DMA.
-
- You can make a NP600A act as a "dumb" card; the Netware server driver did that.
- However it has a simple dispatch loop down on the card that moves stuff
- back and forth between the chip and the host. You also need a host-side
- driver to talk to the board just the right way...
-
- The software you are looking at has an old (1982-3'ish) OS called Comet
- which is used to drive a protocol stack. This allowed a complete
- protocol stack to be shoved into the boards RAM and run on the 186 as opposed
- to on the host. As the 186 runs at 8 Mhertz; performance of this stack
- will always be an issue.
-
- You need 2-3 spec's out of Racal-Datacomm; the NP600 hardware manual;
- the NCX spec which describes the on-board OS, and the spec. which explains
- how to write an NP600 driver.
-
-
- Larry Backman
- FTP Software
-
-