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- Newsgroups: comp.sys.ibm.pc.hardware
- Path: sparky!uunet!haven.umd.edu!wam.umd.edu!tictac
- From: tictac@wam.umd.edu (Shake it to the Left)
- Subject: Help w/SB and Memory Parity Problem
- Message-ID: <1993Jan25.232937.29694@wam.umd.edu>
- Sender: usenet@wam.umd.edu (USENET News system)
- Nntp-Posting-Host: rac2.wam.umd.edu
- Organization: University of Maryland, College Park
- Date: Mon, 25 Jan 1993 23:29:37 GMT
- Lines: 97
-
- Recently I had posted on the network about problems I was having with
- installing a Soundblaster in a 486DX/50 based machine (a Zenon VLB).
- I want to thank those of you that responded, and I want to continue
- my investigation into what underlies the problem with these questions.
-
- When we left off, I was trying to install a regular SB 2.0 in my machine.
- I tried using 1.0 and 2.0, same problems. Test-sbc.exe freezes when
- trying the FM portion, and Windows gets upset when I try and play .WAV
- files, kicking me out and telling me on a blue screen that I have a
- memory parity error.
-
- This I see as two problems.
-
- The FM voice problem is something which, by your messages, Creative
- Labs seems to have acknowledged, but aside from that, where is
- 'the fix?' I am waiting on getting a SB-Pro to see if that may
- solve the problem, but I have gotten one message saying that even
- the Pro has this problem, due possibly to the fact that the bus
- speed runs circles around the SB.
-
- The problem I am now concerned with is that blue screen. I
- want to make sure there is nothing wrong with my machine.
-
- 1) Is a .WAV file FM? If so, it might explain the error, but
- then again, why did test-sbc.exe not kick me out as Windows
- did and say 'Memory Parity Error, System Halted'
-
- 2) Read the following clips from 'Memoirs of an Ultrasound Owner'
- This part/these parts were written by Etienne Mayrand
- (if you are reading this, I'd appreciate you sending me what
- you found out about your memory parity problems)
-
- ----Clips from Etienne's writing-------
- ----------------------
- Troubleshooting
-
- At this point, I was pretty confident that everything was
- fine. But this is not called the troubleshooting section for nothing.
-
- The next logical step was to try the demos. So, I typed
- mididemo.bat to hear the MIDI demos. The screen went blank, then
- nothing. Even the three finger salute was ignored. Grumble, reset. I
- checked everything twice, but still no go. Then, I remembered that I
- had set the bus frequency to a very high 16 Mhz. Maybe the soundcard
- was not able to keep up. I lowered the frequency to 4 Mhz (better be
- safe), launched the demos for the nth time and got... ON BOARD MEMORY
- PARITY ERROR, SYSTEM HALTED. Oh no...
-
- Finally, after two wrenching hours of uncertainty and doubt
- (is the card defective,...is the computer defective...,why me...), I
- discovered a CMOS option that allowed me to disable memory parity
- checking. It worked!! Later, I learned that I could get rid of the
- problem by changing the card setting from DMA channel 7 (16 bits) to
- DMA channel 3 (8 bits) without any loss in performance. Most computers
- have no problems, but I am the unlucky owner of one which does have a
- problem. So, for those who encounter the same glitch, either change
- the DMA channel used by the card, or disable parity checking.
-
- Windows 3.1 compatibility
-
- The UltraSound is Windows 3.1 compatible. At first, I had a
- problem with parity checking (again!). This time, each time I tried to
- launch Windows, it crashed with a "memory parity error". Since I
- thought I had solved that problem earlier by disabling parity checking
- in hardware, I didn't know what to do. Finally, I decided to remove
- any trace of the UltraSound driver from Windows and start over with a
- clean slate. As I was browsing the SYSTEM.INI configuration file,
- angrily deleting every reference to the UltraSound driver, I saw this
- line:
-
- device=*parity
-
- I commented it by adding a semi-colon at the beginning of the
- line, like this:
-
- ;device=*parity
-
- Then, I installed the UltraSound driver and restarted Windows.
- It worked! No more parity errors! (champaign, anyone?).
-
- To my knowledge, I am the only one who had this problem. It
- may be my memory chips, or a bug, or some mysterious conflict in
- memory. In case someone else has a similar problem, here's the
- recommended procedure for the installation of the UltraSound Windows
- 3.1 driver:
- -----------------------------end of clip----------------------------
-
- Etienne, if you read this, please let me know what you found out about
- your mysterious problem. For those of you patient enough to bear along
- with this message, have you seen this problem before? (Memory Parity
- Error?) What causes it? What can solve it?
-
- Concerned about more than the soundcard now,
- A. Almeida
- tictac@wam.umd.edu
- <please send replies directly to me, if anyone is curious about
- my findings, mail me and I will let you know>
-