cwang@copper.ucs.indiana.edu (Ted Wang) (06/09/91)
Hello! I have a 80386-25 based PC with 64K cached memory and 4MB RAM. It uses a noname motherboard and AMI BIOS. When I turn on the computer, it does self memory testing and says 3968 OK instead of 4096 OK. I thought that this might because of the SIMMs, so I pulled out the SIMMs ( four 1MBx9 SIMMs) in my computer and plugged into my friend's computer and everything's fine (I mean he got 4096 OK message after the memory test). Any idea of where the lost 128K goes in my computer? Thanks in advance! Ted Wang cwang@copper.ucs.indiana.edu
shutton@bronze.ucs.indiana.edu (Scott K. Hutton) (06/09/91)
cwang@copper.ucs.indiana.edu (Ted Wang) writes: >Hello! I have a 80386-25 based PC with 64K cached memory and 4MB RAM. >It uses a noname motherboard and AMI BIOS. When I turn on the >computer, it does self memory testing and says 3968 OK instead of 4096 >OK. I thought that this might because of the SIMMs, so I pulled out >the SIMMs ( four 1MBx9 SIMMs) in my computer and plugged into my >friend's computer and everything's fine (I mean he got 4096 OK message >after the memory test). Any idea of where the lost 128K goes in my >computer? Thanks in advance! There was a question with a similar answer earlier. If you look in your CMOS setup, you will probably see that you have either or both of your Main and Video BIOS shadowed. This will automatically take about 192K out before you get to the memory count. Works on mine! Don't worry... it's still there; it's just being used! _____________________________________________________________________________ Scott K. Hutton, KA9WTR Internet: SHutton@UCS.Indiana.edu UCS Support Services SHutton@Bronze.UCS.Indiana.edu Indiana University Bitnet: SHutton@IUIS, SHutton@IUBACS
ckp@grebyn.com (Checkpoint Technologies) (06/09/91)
In article <1991Jun8.201349.14697@bronze.ucs.indiana.edu> cwang@copper.ucs.indiana.edu (Ted Wang) writes: >Hello! I have a 80386-25 based PC with 64K cached memory and 4MB RAM. >It uses a noname motherboard and AMI BIOS. When I turn on the >computer, it does self memory testing and says 3968 OK instead of 4096 >OK. (Sorry, this is not an answer to your question Ted...) A similar thing happens to me, but stranger. With 4M installed, the self test says 4096K, which is what I expect. But with 8M installed, it says 8064K - which is 128K short. I have a 386-33, apparently made by a company called TTL, and an AMI BIOS. -- Richard Krehbiel, private citizen ckp@grebyn.com (Who needs a fancy .signature?)
exnirad@brolga.cc.uq.oz.au (Nirad Sharma) (06/10/91)
ckp@grebyn.com (Checkpoint Technologies) writes: >In article <1991Jun8.201349.14697@bronze.ucs.indiana.edu> cwang@copper.ucs.indiana.edu (Ted Wang) writes: >>Hello! I have a 80386-25 based PC with 64K cached memory and 4MB RAM. >>It uses a noname motherboard and AMI BIOS. When I turn on the >>computer, it does self memory testing and says 3968 OK instead of 4096 >>OK. >(Sorry, this is not an answer to your question Ted...) >A similar thing happens to me, but stranger. With 4M installed, the >self test says 4096K, which is what I expect. But with 8M installed, it >says 8064K - which is 128K short. I have a 386-33, apparently made by a >company called TTL, and an AMI BIOS. >-- >Richard Krehbiel, private citizen ckp@grebyn.com >(Who needs a fancy .signature?) I don't know if this will help but when I had exactly the same problem with an IBM PS/2 Model 80 I was told that as soon as installed memory exceeds a certain level (2M for me) the system starts ROM shadowing. This could be what's happening to you people. Shadowing isn't much use to me as I run SCO Xenix which ignores most of the system ROM. -- Nirad Sharma (exnirad@brolga.cc.uq.oz.au) Phone : (+61 7) 365 7575 Systems Programmer Fax : (+61 7) 870 5080 Continuing Education Unit The University of Queensland. QLD 4072
jpollard@silver.ucs.indiana.edu (06/13/91)
In article <1991Jun8.201349.14697@bronze.ucs.indiana.edu> cwang@copper.ucs.indiana.edu (Ted Wang) writes: >Hello! I have a 80386-25 based PC with 64K cached memory and 4MB RAM. >It uses a noname motherboard and AMI BIOS. When I turn on the >computer, it does self memory testing and says 3968 OK instead of 4096 >OK. I thought that this might because of the SIMMs, so I pulled out >the SIMMs ( four 1MBx9 SIMMs) in my computer and plugged into my >friend's computer and everything's fine (I mean he got 4096 OK message >after the memory test). Any idea of where the lost 128K goes in my >computer? Thanks in advance! > >Ted Wang >cwang@copper.ucs.indiana.edu >
brigc@world.std.com (Brig C McCoy) (06/13/91)
In article <1991Jun12.192458.16961@bronze.ucs.indiana.edu> jpollard@silver.ucs.indiana.edu () writes: >>Hello! I have a 80386-25 based PC with 64K cached memory and 4MB RAM. >>It uses a noname motherboard and AMI BIOS. When I turn on the >>computer, it does self memory testing and says 3968 OK instead of 4096 [... ...] >>Any idea of where the lost 128K goes in my computer? Thanks in advance! >> >>Ted Wang >>cwang@copper.ucs.indiana.edu I'm not positive about this particular piece of hardware, but I know several of the newer machines are set up to use 128K to "shadow" the ROM code... that is copy the ROM code to the 128K of RAM where it'll run faster. +-----------------------------------------------------------------+ | Brig C. McCoy -- "Standard disclaimers" | | Systems Administrator -- | | Soft-tek International -- Internet: brigc@world.std.com | | 1999 North Amidon, Suite 340 -- Voice: 316 838-7200 | | Wichita, KS 67203-2124 -- Fax: 316 838-3789 | +-----------------------------------------------------------------+
waltp@bingvaxu.cc.binghamton.edu (walter piotrowski) (06/13/91)
The missing 128kB holds a RAM copy of the ROM BIOS. It's copied into RAM for speed. -- ----------------------------------------------- Walter G. Piotrowski Computer Science Department - Watson School State University of New York