Subject: Re: MUX serial cards.
To: None <>
From: Jason Thorpe <>
List: port-hp300
Date: 07/24/1996 08:53:17
On Wed, 24 Jul 1996 09:40:32 -0500 wrote:

 > I picked up a couple of these serial cards that look to be the short length.
 > (they're at home and I didn't write down the number)
 > They've got three RJ-11? jacks and a DB 25 female port.  
 > a) are they of any use?  (since my 340's slot is full)
 > b) can they be used in a 330? (since flip has one :) )
 > c) does anybody want one?

That's a 4-port DCM card.  From dmesg on my hp380:

NetBSD 1.2A (BASALT) #0: Sat Jun 22 13:12:55 PDT 1996
HP9000/380/425 (25MHz MC68040 CPU+MMU+FPU, 4k on-chip physical I/D caches)
[ . . . ]
dcm0 at scode13 ipl 3 flags 0xe
[ . . . ]

I use port 0 for my PPP link (it's the only port with modem control).  
The rest are usable for terminals.  Port 1 can be used as the console if 
the remote switch it set on the card.

The serial performance on the dcm card is certainly better than the 
built-in serial on the lower-end 300s... The 345/375/380/400-series have 
a FIFO on the built-in port, so the gain is a little less.

Anyhow, they're certainly usable, as long as you have DIO slot available :-)

Somewhere in the port-hp300 archives is a pinout of the RJ ports, so you 
can make serial cables for them.

 -- save the ancient forests - -- 
Jason R. Thorpe                             
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