cs161fdf@sdcc10.ucsd.edu (cs161fdf) (12/29/90)
Hi everyone,
I have a 33 MHz 386 pc by Positive. I think the mother board is
made by Eltech Research Inc. The system came with 1 meg
of 256k SIMMs, and after upgrading to 4 megs I think that I am having
memory problems. System hangs or gives Unrecoverable App.
Error in windows 3.0 when I tried to do anything and occationally hangs
in DOS also. CHECKIT gave me the following result:
MEMORY TEST PASS #1 RESULTS: (QUICK TEST ONLY)
Program Buffers.............................................Passed
Base Memory.................................................Passed
Extended Memory.............................................FAILED ***
ERROR at Address 221B48h, Bits ..D......654..10 Parity
ERROR at Address 221B4Ah, Bits .....A.........0 Parity
ERROR at Address 231B48h, Bits ..DC.A9.7.54.... Parity
ERROR at Address 231B4Ah, Bits FED..A9.....32.. Parity
ERROR at Address 241B48h, Bits ...C.A.8.654.2.0 Parity
ERROR at Address 241B4Ah, Bits .E.CB.9..6.43... Parity
ERROR at Address 261B48h, Bits FEDCBA9876543210
. . .
. . .
The error is always at address xx1B48h, but the memory test gets
through with no errors if i load HIMEM.SYS that comes with windows 3.
So I don't know what to make of this.
When I put in 4 megs, I had to change 2 PAL chips (from
Positive) on the mother board. Can anyone tell me what these are?
I put the old memory and PAL chips back in and ran the test and
got no errors. I don't think the problem is with 1 meg SIMMs either,
since I tested them on another machine. Can something be wrong with
new PAL chips that I put in?
Please email me any thoughts or ideas on this.
Thanks.
ye
(cs161fdf@sdcc10.ucsd.edu)sukenick@sci.ccny.cuny.edu (SYG) (01/02/91)
>of 256k SIMMs, and after upgrading to 4 megs I think that I am having >memory problems. System hangs or gives Unrecoverable App. >Error in windows 3.0 when I tried to do anything and occationally hangs > Extended Memory.............................................FAILED *** >The error is always at address xx1B48h, but the memory test gets >through with no errors if i load HIMEM.SYS that comes with windows 3. >So I don't know what to make of this. There are many methods of checking memory, and some are better at finding errors than others; however the "better" methods tend to take more time. Look up the October/90 issue of (IEEE) Computer magazine for more info. What to do in the meantime: Try each of these, and at the end of each, see which works. 1) Try the system at a slower speed, if that is switchable. 2) Are the new SIMMs the same (or faster) speed than the old ones? 3) Try taking then out (whilest donning ye olde grounde strape) using compressed air (the canned stuff is fine) and cleaning the dust on the board. Put them back in the same order that you took them out. If the problem is still at the same address(es): 4) Take the SIMMs out and shuffle them (no, don't throw them up in the air do it in some logical manner, keep track of which goes where) . If the address shifts, it's a bad SIMM, you'll have to figure out which SIMM corresponds to which bits/addresses and replace it. >got no errors. I don't think the problem is with 1 meg SIMMs either, >since I tested them on another machine. Can something be wrong with other machine had the same speed? >new PAL chips that I put in? Surely, if 4) shows no change in the address of the error. The other possibility is a motherboard problem, such as a power problem or intermittant short.