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- From: eddy@einstein.et.tudelft.nl (J.G.E. Olk)
- Subject: Re: Problems with Philips CM50 CDROM player on fast PCs
- Message-ID: <1992Dec18.095902.4297@donau.et.tudelft.nl>
- Sender: news@donau.et.tudelft.nl (UseNet News System)
- Nntp-Posting-Host: einstein.et.tudelft.nl
- Organization: Delft University of Technology, Dept. of Electrical Engineering
- References: <1992Dec17.124523.16141@donau.et.tudelft.nl>
- Date: Fri, 18 Dec 1992 09:59:02 GMT
- Lines: 35
-
- eddy@einstein.et.tudelft.nl (J.G.E. Olk) writes:
-
- >Anyone got a solution to get the Philips CM50 CDROM player and the
- >proprietary interface card working on a fast machine?
-
- >The problem I experience with it is that reading a CDROM does not work
- >on all machines (I tried quite a few), the audio control stuff does however.
- >Especially on 486 machines (ISA or EISA) the CM50 won't read CDROMs,
- >disabling (all) caches doesn't help. On a 386DX/33 it works more or
- >less, although there are occasional read errors and, strangely enough,
- >lowering the CPU clock speed to 8MHz also puts the CM50 out of order.
- >On a 4.77/9.54 MHz V20 XT it works like a charm and switching the CPU
- >clock doesn't give any troubles.
-
- >I'm almost sure there is a problem in the PHILIPS.SYS device driver,
- ^^^^^^^^^^^-> CDROM.SYS
- >most likely with the DMA stuff to read the CDROM. I suspect there must
- >be some sort of relation between the CPU speed and the DMA transfer
- >speed. The PHILIPS.SYS I use is version 1.03, Oct. 1991.
- ^^^^^^^^^^^-> CDROM.SYS
- >Perhaps someone knows of a newer version?
-
- Whoops! Major typos. Really need those holidays :-)
-
- >Furthermore, I'd be very happy if someone could provide me with info
- >on the properietary interface so I can write my own DOS/Linux device
- >driver.
-
- >Thanks,
- >- Eddy
- >--
- >\ Eddy Olk Section Computer Architecture \
- >/ email: eddy@duteca.et.tudelft.nl Department of Electrical Engineering /
- >\ phone: +31-15-785021 Delft University of Technology \
- >/ The Netherlands /
-