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Subject: PacketRadioDigest 99/109
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Packet-Radio Digest Sun, 16 May 99 Volume 99 : Issue 109
Today's Topics:
Baycom modem to USB port? (3 msgs)
Best windows packet software???
DRSI Drivers (2 msgs)
FS:HAL PCI-4000
Send Replies or notes for publication to: <Packet-Radio@UCSD.Edu>
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Archives of past issues of the Packet-Radio Digest are available
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Loop-Detect: Packet-Radio:99/109
----------------------------------------------------------------------
Date: Sat, 15 May 1999 09:13:36 +0100
From: Roger Barker <roger@peaksys.demon.co.uk>
Subject: Baycom modem to USB port?
In article <7hi802$9r6$1@brokaw.wa.com>, Jeff McLeman
<jeffmcleman@hotmail.com> writes
>The USB class drivers should create a "com" port device. Therefore, as long
>as programs
>do the usual open/close/read/write to com devices, you should be fine. If
>the software tries to
>talk to the hardware directly, then, that will be a problem.
Which is exactly what Baycom drivers need to do. Also a low and
consistent latency in servicing the modem status interrupt is critically
important.
So, to return to the original question:-
>> > Marty <marty-k2@snet.net> wrote in message
>> > news:373B204E.13872DE8@snet.net...
>> > > Can a Baycom modem, such as a BP-1, can be connected through the a USB
>> > > port, and if so, how it would be wired?
The answer is - you can wire an RS232 device through an RS232 to USB
converter, but there's no way you could get a Baycom modem to work by
doing that.
--
Roger Barker, G4IDE roger@peaksys.demon.co.uk
Boston, UK http://www.peaksys.demon.co.uk
>.
------------------------------
Date: Sat, 15 May 1999 09:21:03 GMT
From: keinanen@sci.fi (Paul Keinanen)
Subject: Baycom modem to USB port?
On Fri, 14 May 1999 15:27:22 -0700, "Jeff McLeman"
<jeffmcleman@hotmail.com> wrote:
: The USB class drivers should create a "com" port device.
: Therefore, as long as programs
: do the usual open/close/read/write to com devices, you should be fine.
: If the software tries to
: talk to the hardware directly, then, that will be a problem.
The problem is that the Baycom is _not_ a COM port device and it has
nothing to do with RS-232 style serial communication. It does _not_
use the TxD and RxD pins for serial communication.
Baycom does not use the UART for converting parallel bytes to a serial
bit stream, since the UART operates in asynchronous mode, embedding
every byte between start and stop bits. The AX.25 protocol uses the
synchronous mode with no start and stop bits for each character. The
Baycom system does all the parallel/serial and serial/parallel
conversion in software and alters the state of the COM port handshake
pins in a non-standard way as serial input and output data pins. This
requires precise (submillisecond) timing and usually consumes a lot of
CPU resources and thus works best with MS-DOS style toy operating
systems.
Even if you could control the handshake pins of an external RS-232
port connected through the USB using various I/O-control calls and
detect state changes on the input handshake pins, the problem is how
to get a consistent submillisecond timing accuracy. Thus, it does not
make much sense to use USB for Baycom.
A few years ago, there was a system called PMP (Poor Man's Packet)
which used the handshake pins of the parallel port (instead of the
handshake pins of the serial port as Baycom does), so this might be a
solution if all COM ports are in use, but the parallel port is unused.
But since it operates in the same way as Baycom, it also suffers from
the same problems as Baycom.
Paul OH3LWR
>.
------------------------------
Date: Sat, 15 May 1999 06:24:47 -0500
From: "Charles Brabham" <n5pvl@texoma.net>
Subject: Baycom modem to USB port?
I saw a USB - to - Parallel port converter at Wall-Mart's the other day. I
wasn't expensive. Whether it would work with any of the parallel-port modems
is another question altogether.
Charles Brabham,
N5PVL @ N5PVL.#NTX.TX.USA.NOAM
http://www.texoma.net/~n5pvl
>.
------------------------------
Date: Mon, 10 May 1999 07:38:52 -0700
From: rjc100@ibm.net
Subject: Best windows packet software???
I am looking for the best packet radio software that will run on
Windows 3.1... THANKS
>.
>.
------------------------------
Date: Sat, 15 May 1999 08:19:59 -0600
From: "WB7GR-1" <wb7gr@cheyenneweb.com>
Subject: DRSI Drivers
I am looking for the drivers for a DRSI (1200) PC Packet Adapter.
Specifically a file called HAPNDRSI.SYS
Anyone know where I might find such a file?
Thanks.
wb7gr@cheyenneweb.com
>.
------------------------------
Date: Sat, 15 May 1999 17:10:46 +0200
From: anders.lageras@bigfoot.com (Anders Lageras)
Subject: DRSI Drivers
WB7GR-1 <wb7gr@cheyenneweb.com> wrote:
> I am looking for the drivers for a DRSI (1200) PC Packet Adapter.
>
> Specifically a file called HAPNDRSI.SYS
>
> Anyone know where I might find such a file?
No, but a packet driver that works with most drsi cards is flexnet.
http://dl0td.afthd.tu-darmstadt.de/~flexnet/index.html
--
73 de SM7UZI Anders Lagerås
>.
------------------------------
Date: Mon, 10 May 1999 13:12:51 -0400
From: Robert Stamper <rstamper@worldnet.att.net>
Subject: FS:HAL PCI-4000
I have for sale a HAL PCI-4000.This is a high quality HF radio DSP
multimode modem for RTTY,AMTOR,PACTOR and CLOVER.The unit is in perfect
working order and comes with the modem,manual,software and cable.The
orignal cost was $999.00 abt 2 years ago.Asking $275.00 shipped to lower
48.Please reply via. e-mail.
Regards
Bob Stamper
>.
------------------------------
End of Packet-Radio Digest V99 #109
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