Internal 2400 baud modem for the unix pc
Gary S. Trujillo
gst at gnosys.svle.ma.us
Thu Jan 4 09:05:19 AEST 1990
In article <1990Jan1.173553.11869 at ntvax.uucp> canoaf at 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 at 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 at 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 at gnosys.svle.ma.us
Somerville, Massachusetts {wjh12,spdcc,ima,cdp}!gnosys!gst
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