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IBM 5170  -  GSETUP


Motherboard BIOS configuration of the 5170 is referred to by IBM as SETUP.  Some people refer to it as CMOS SETUP.
IBM's way of performing SETUP, is to use boot the 5170 from the 'Diagnostics for the IBM Personal Computer AT' floppy.

The use of the third-party DOS program GSETUP.EXE is an alternative.

If you decide to use GSETUP.EXE, then note the following known problems/issues:

Problems/Issues

1. A design flaw in GSETUP is that it expects the existing expansion memory setting in the CMOS/RTC chip to be 0 or a multiple of 128 KB (which is the norm).
If, for whatever reason, the existing expansion memory is not 0 or a multiple of 128 KB, then you will probably discover that you cannot set the expansion memory setting to the figure that you need it to be.
If you are in that situation, you need to clear the CMOS/RTC chip by performing the procedure here, and then rerun GSETUP.
   
2. The first BIOS revision (01/10/84) in the IBM 5170 does not support 720K drives/diskettes, but with that BIOS fitted in your 5170, GSETUP incorrectly allows you to set the floppy drive type to 720K.
That is a design flaw in GSETUP.
Note that taking advantage of the flaw will not magically provide 720K support in the BIOS.
   
3. The first BIOS revision (01/10/84) and the second BIOS revision (06/10/85) in the IBM 5170 do not support 1.44M drives/diskettes, but with either of those BIOS' fitted in your 5170, GSETUP incorrectly allows you to set the floppy drive type to 1.44M.
That is a design flaw in GSETUP.
Note that taking advantage of the flaw will not magically provide 1.44M support in the BIOS.