Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!snorkelwacker!spdcc!gnosys!gst
From: gst@gnosys.svle.ma.us (Gary S. Trujillo)
Newsgroups: comp.sys.att
Subject: Re: Internal 2400 baud modem for the unix pc
Summary: John Milton answered this question.
Message-ID: <559@gnosys.svle.ma.us>
Date: 3 Jan 90 22:05:19 GMT
References: <1990Jan1.173553.11869@ntvax.uucp>
Reply-To: gst@gnosys.UUCP (Gary S. Trujillo)
Organization: gst's 3B1 - Somerville, Massachusetts
Lines: 52

In article <1990Jan1.173553.11869@ntvax.uucp> canoaf@ntvax.uucp (Augustine Cano) writes:
> ... 
> Some months ago, someone reported on some preliminary research about replacing
> the 1200 internal modem chip on the unix pc with a compatible 2400 baud chip.
> Further investigation was needed, but nothing else was ever heard...

Hmmm.  I thought the answer to this question was placed into the periodically-
posted "Answers to Commonly-Asked Questions," but I can't seem to find it in
my archived copy of the last one I snatched back in March.

Anyway, John B. Milton dealt with the question in one of the articles in his
"HwNote" series:

| From: jbm@uncle.UUCP (John B. Milton)
| Newsgroups: comp.sys.att,unix-pc.general
| Subject: Re: Can the 7300's modem go 2400 Baud?; HwNote11
| Keywords: HwNote P6 2400 floppy tape second hard drive
| Message-ID: <459@uncle.UUCP>
| Date: 14 Jan 89 08:30:04 GMT
| 
| ...Here we go again...
| 
  [a bunch of 2400 symbols from hardware.h & modem.h deleted]
| 
| >	Can the modem go 2400 Baud?  If not, why were these #define's made?
| 
| Those 2400 things are there BECAUSE...
| 
| Convergent Technologies, the OEM of the S4 (safari 4) a.k.a UNIXpc, was
| working on the next model of the machine. This was to be mother board
| revision P6.
|
| Things to be added:
| 
| 1. 2400 baud internal modem.
| 2. Provisions for a second hard drive.
| 3. Addition of a 4th hard disk head select bit.
| 4. Addition of a floppy tape drive, simlar to the external one, but slower!
| 5. Addition of a some cicuitry so that the kernel could sense a P6 mother
|    board and react properly.
| 
| ...The 2400 baud modem stuff was only put in as stubs. There is no real code
| to drive the 2400 baud modem if it was there. The 2400 baud modem DID work on
| machines inside Convergent. It used a proprietary AT&T 2400 DSP modem chip.
| This is the sort of thing AT&T uses to make their own modems. It is not some-
| thing the rest of us could get ahold of for reasonable prices. These days,
| there is no point with 2400 baud modems coming down in price...

-- 
--
Gary S. Trujillo			      gst@gnosys.svle.ma.us
Somerville, Massachusetts		      {wjh12,spdcc,ima,cdp}!gnosys!gst