Dear Help Screen,
I have an old 80486 DX-40 PC running MS Office 4 with the
following specifications:
Windows 3.11 and DOS 6.22
AMIBIOS (C)1993 30X-VS-XX-CP
8Mb RAM (8x1Mb sticks)
VESA local bus
210 HDD
In the hope of enticing one of my children to use it at university for typing assignments, etc (in lieu of buying a second-hand Win9x PC), I dusted it off and added 16Mb of RAM. I replaced the first bank of 4x1Mb sticks with 4x4Mb sticks and retained the second bank of 1x1Mb sticks (they are under the power supply and therefore not easy to remove).
On boot-up, the 20096 Kb of memory is recognised but this is followed by the error message:
CMOS memory size mismatch.
Run setup utility.
Press F1 to resume.
However, upon entering the Standard CMOS Setup the total memory installed is recognised: Base Memory: 640 Kb Extended Memory: 19456 Kb
My understanding is that I have 3 options from here: 1) Remove the second bank of 1x1Mb sticks. (This would involve removing the power supply unit first.); or 2) Run the CMOS AutoConfiguration with BIOS Defaults; or 3) Run the CMOS AutoConfiguration with POWER-ON Defaults.
I would be grateful for any advice you can provide. I am hoping a solution can be found whereby the full 20 Mb RAM can be retained (20Mb is better than 16).
Thanks in advance.
Roy Hayward Grafton 6 July 2002
