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From: plim@hpsgpa.HP.COM (Peter Lim)
Newsgroups: comp.sys.ibm.pc
Subject: Re: AMI bios
Message-ID: <340021@hpsgpa.HP.COM>
Date: 15 Nov 89 09:26:50 GMT
References: <13225@eerie.acsu.Buffalo.EDU>
Organization: HP Singapore IC Design Ctr
Lines: 48

>  Hi! I am using AMI BIOS (c)1989 on my '386. I have a problem and a quick
> 
Me too. Skip the hard disk bit, I don't know much in that area.

> My question:
> I saw an option to change CMOS to have "Shadow RAM". I can enable
> BIOS Shadow RAm, EGA Shadow RAM, and Interleave Memory.
> Should I enable all 3 types?pes??? What does Shadow RAM mean? BIOS
> Shadow RAM seemed to speed up the CPU.
> 
Go ahead, enable all 3 types and the PC will decide which one to
turn off at run time if not applicable. Shadow RAM means copying the
content of ROM into RAM and from then on run using the RAM, and of
course it speeds up the system as RAM runs a lot faster than ROM.


> Also, I have 1MB installed. The computer BIOS at BOOT-UP checks
> from 0-1024KB, but I cannot get use from 640K-1MB. I tried
> the emm.sys that comes with MSDOS 4.01 but it says memory is not
> available. I know this memory is called expanded memory.
> I want to command.com in a ramdisk in this memory to
> speed up shelling to DOS, etc... How do I do this??
> I tried enabling between 640K-1MB in CMOS, but I get 8 beeps when I
> boot up (and must change this back)....
> 
I think you can't recover the 384K between 640K and 1Meg. As far as
I know, they are dedicated to shadow RAM usage and are simply not
used if shadow RAM is off. Don't know, some machine might allow you
to remap these RAM to above 1Meg with some switch setting. Now if
you are running a 386, then you might like to use QEMM from Quaterdeck 
which allows you to load most of your TSR into the memory in between
640K and 1Meg which are not used.

I managed to enable the 64K just above 640K and get a total of 704K
for DOS. I was using Hercules which did not use this memory range.


Regards,
Peter Lim.
HP Singapore IC Design Center.

      E-mail address:              plim@hpsgwg
      Snail Mail address:          Peter Lim
                                   Hewlett Packard Singapore,
                                   (ICDS, ICS)
                                   1150, Depot Road,
                                   Singapore   0410.
      Telephone:                   (065)-279-2289