>On Sun, 14 Mar 1999, Maurice Smiley wrote:
>
>> > LocalTalk does run at double that speed, and the RAW serial ports are
>> > capable of dealing with 230kbps speeds...BUT, in order to achieve those
>> > speeds, you would need to use an external clock. The connectix QuickCam is
>> > an example of this I believe. It actually provides a clock for the serial
>> > port in order to get higher throughput to the serial port. To my knowlege,
>> > the only Macs that can go higher than 57600 w/o external clocking are the
>> > geoport-equipped ones, such as the AV Macs.
>>
>> Umm...it works on the MacOS side.  In fact, 3Com lists the entry level Mac
>> for running this as a Mac Plus running System 7.  So, it would seem that the
>> issue is indeed NOT the hardware being able to drive 115200, but either a
>> NetBSD configuration issue, *OR* NetBSD not supporting serial port speeds
>> over 57600.
>>
>> Can anyone confirm or deny this?
>
>The hardware can do 115200 and 230400 asynchronous mode (*). However I
>don't think that our kernel will support the interrupt load represented by
>either of these baud rates, and so I have the ports set to not enable
>those rates. Remember you're talking one interrupt every 10 bits, so
>you're talking 12k or 23k interrupts/sec.
>
>I'd be interested to know what 3Com does with the MacOS driver.

Actually, there is no driver. It's an external "modem"...you use it just
like any hayes-compatible. Unless you can get 115200 to show up in FreePPP
or whatever you're using, then you're still SOL as far as getting any use
out of bonding.

If you've got a capable Mac, you can use the serialspeed 230 to get the
higher speeds accessable...In the tumultuous times of the divergence of
MacPPP (FreePPP) just after 2.0.2, there were like 3 versions of the
module...Cliff McCullom, Steve Dagley & I forget who the other guy was each
had versions with features that the other lacked. I believe that it was
Steve Dagley's FreePPP 2.2.0SD that had the built-in higher speed support.

I've used the ImpactIQ TA for a couple years now on my Q840AV (MacOS w/
occasional NetBSD) and now have it hooked up to my AlphaStation running
NetBSD as a NAT server.

Mike
Bikers don't *DO* taglines.