Arcom SBC104, Technical Manual

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Appendix B. Disabling the On-board Flash
The AFFS Flash Filing System used to organise the on-board Flash always assigns the on-board
memory as drive C:\. If it is necessary for your primary c:\ drive to be a IDE hard drive then the Flash
should be disabled (This is particularly useful if the SBC104 is intending to run Windows from an IDE
drive).
To disable the Flash enter the BIOS SET-UP as described in Appendix B. Press Pg Up (Page Up) to
the Chipset Register menu. A warning message will be displayed saying that improper use of the
Chipset registers may cause the system to fail. Press any key to reach the register table. Scroll down
to register 48 and across to bit 4. Press the space bar to change the 1 to a 0. Scroll right to bit 5 and
press the space bar to change this to a 0. This will disable the part of the EPROM BIOS that loads in
the AFFS to run the Flash memory. Press F10 to re-boot. The SBC104 will boot, without the usual
AFFS and Millennium Check messages, to the floppy or hard drive that is connected.
To activate the Flash simply return to the Chipset register menu in the BIOS SET-UP and change bits
4 and 5 of register 48 back to 1’s.
WARNING: Do not alter any of the other values in the Chipset register menu. If the SBC104 does not
appear to work correctly after the BIOS settings have being changed then turn of the SBC104 move
LK3 from position A to B. Wait a few seconds and then replace LK3 back in position A. Turn on the
SBC104 and the BIOS will boot the SBC104 with the default BIOS settings.
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2192-08704-000-000 J562 SBC104