🚀 go-pugleaf

In article <1993Jan25.130101.14684@dcs.warwick.ac.uk>, cae@dcs.warwick.ac.uk (Charles Elliott) writes:
> 
> I posted something about this a week ago, but got no replies. Here is the
> current situation.
> 
> I have a 486/33 with 8Mb, SIS chipset and AMI BIOS dated 07/07/91. When
> I boot up, the memory test only tests to 8064 Kb (a loss of 128Kb). Okay,
> so this is for shadowing. In the setup, there is no option to turn BIOS 
> shadowing on or off specifically, but there is an option saying 'Shadowing
> Option', and the BIOS help says that all shadowing is disabled if this option
> is disabled. Despite disabling this, the memory only test up to 8064. Despite
> this, I can turn video and other 32Kb shadows on, but even with them all
> enabled (and the shadowing option enabled) I still only lose 128Kb. Regardless
> of all settings (shadowing on or off, all or no other blocks shadowed), MSD
> tells me that 32Kb at C000 is taken for ROMS (I assume for the video) and 
> 64Kb is taken at the top of the 1Mb (for BIOS code?) and also, 8Kb is taken
> (I think at D800) for the BIOS on board my cacheing IDE controller.
> 
> This shadowing control problem (or complete lack of it) seems to be an
> AMI BIOS bug!! Has anyone else come across it.
> 
> 
> Thanks in advance (somebody must know some answers!)
> 
> Charles
> 

I wonder, my 286 has AMI bios 04/09/90 (or 09/04/90). Originally it had
1 Mb memory, I increased it to 3Mb and enabled shadowing for BIOS and
Video, it clicked to 3072. Then I added 2Mb and now it clicks to 5120.
I always thought it checks the whole memory whether one has shadowing
enabled or not, I may be wrong.
Are you sure that your chips (simms, sipps) are all ok? I mean that is
what it does while booting, tests the menory.

Seppo