Mailing List Archive: CD-ROM Speed Reported Incorrectly

CD-ROM Speed Reported Incorrectly

Jan 22, 1999, 8:14 PM

Post #1 of 3 (190 views)

I have an Acer 24x CD-ROM drive. It's a plain vanilla ATAPI drive
with all the drivers built as modules. When I mount a CD this is the
message I get:
hdb: ATAPI 20X CD-ROM drive, 1800kB Cache
When I boot into my Win 95 partition it says it's a 24X drive.
Who's right?
I'm running the -final kernel, and everything else is up to date wrt
the versions given in the Changes doc. I started seeing this in the
pre7 kernel, which was the first of the pre series I used.
Other than that message the drive seems to work just fine. I can
mount data CD's and play music CD's without a problem. I can't,
however, eject the disk. I've seen that problem discussed here
before. I don't know if it was supposed to be fixed in the final
version, but I just wanted to report that it's still happening to me.
Walt Mankowski
waltman@netaxs.com
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Re: CD-ROM Speed Reported Incorrectly [ In reply to ]

waltman at netaxs

Jan 22, 1999, 10:07 PM

Post #2 of 3 (183 views)

Permalink

On Fri, Jan 22, 1999 at 10:14:07PM -0500, Walt Mankowski wrote:
> I can
> mount data CD's and play music CD's without a problem. I can't,
> however, eject the disk.
It turns out that was just my CD player. I tried another one and it
does eject the disk without a problem. Sorry for the confusion.
Walt
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Re: Setting terminal baud-rate. [ In reply to ]

rhw at BigFoot

Jan 23, 1999, 7:09 AM

Post #3 of 3 (183 views)

Permalink

Hi Ted, Richard.
>> There are no errors. A connected modem works fine. However, this
>> is a long-used call-back program which runs fine at speeds at and
>> below 38400. However when I set the speed to higher values, I
>> noted that the modem would only connect at 1200 baud!
> Well, I can't duplicate it on my 2.2.0-pre7 machine, with RedHat 5.2,
> and glibc 2.0.7.
I have seen the described behaviour in the past, and the problem was
modem-specific...
In my case, it was a Pace Supreme 14k4 FaxModem, and the modem
firmware had a bug in it where if the serial baud rate was higher than
38,400 Baud, it would quite happily talk across the serial link at
whatever speed was set, but would only allow the modem to connect at
speeds up to 4,800 Baud - yes, it would connect at 4,800 Baud (which
uses the 9,600 Baud signalling method) but not at 9,600 Baud.
I proved this by trying different modems - with that Pace being an
external modem (yes, the PC had a 16550AF uart), that wasn't hard. An
external USR Sportster 14k4/VoiceFax and an external BT 14k4 modem
both worked perfectly if the serial baud rate didn't exceed 57,600,
which is all they're specified up to - neither would even see the
text sent over the serial port at 115,200 Baud.
At the time, I wasn't on the Internet, but I wrote to Pace about this,
and received a note thanking me for the information, but not otherwise
commenting...
Hopefully, that helps...
Best wishes from Riley.
---
* ftp://ftp.MemAlpha.cx/pub/rhw/Linux
* http://www.MemAlpha.cx/~rhw/kernel.versions.html
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