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- From: aki@cruzio.santa-cruz.ca.us
- Newsgroups: comp.sys.ibm.pc.misc
- Subject: Re: Sony CD-ROM drives, any gotchas?
- Message-ID: <4861@cruzio.santa-cruz.ca.us>
- Date: Tue, 05 Jan 93 18:26:12 PST
- References: <93005.43985.J056600@LMSC5.IS.LMSC.LOCKHEED.COM>
- Sender: aki@cruzio.santa-cruz.ca.us
- Reply-To: aki@cruzio.santa-cruz.ca.us
- Lines: 34
-
- In article <93005.43985.J056600@LMSC5.IS.LMSC.LOCKHEED.COM>, J056600@LMSC5.IS.LMSC.LOCKHEED.COM writes:
- > In <1993Jan5.161014.7033@bcrka451.bnr.ca>, Roy Shepard writes:
- >
- > >I am thinking of adding a SONY CD-ROM drive to my 486SX. Are there
- > >any gotchas with this, especially with regards to conflicts with sound
- > >boards or COM ports?
- >
- > I'd look out for IRQ conflicts more than anything. Often, CD-ROMs are set up
- > on IRQ2 (the cascading interrupt to IRQ10-15?). I don't believe that they
- > need specific COM ports like a modem. There will be no conflict with sound
- > boards as long as they don't share IRQs (sound boards most often use IRQ7,
- > and sometimes IRQ5 as well). COM ports take IRQ3 and IRQ4. Unless you are
- > familiar with what IRQs are, your best bet may be to just set it to IRQ2
- > and forget about it.
-
-
- In fact most (read: I have yet to find an exception) CD-ROM drivers
- DO NOT use the IRQ and DMA capabilities of CDROM adapters. The data
- rate from the drive is too low. Everybody does polled I/O and saves
- a month in debugging.
-
- What does this mean for the regular CD-ROM user? Read the fine print.
- If the driver manual seez that it doesn't use DMA or IRQ's, don't
- worry about conflicts.
-
- As far as user friendliness goes: DO NOT buy a drive that uses
- those CD cases (i.e. the things you need to stick the disk in to
- get the disk into the drive). It's such a waste of time and
- money. I made the mistake.
-
- Aki.
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