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Chapter 2 WINBIOS Setup 65
3 Programming the Flash ROM
All versions of the Apollo IV motherboard use Flash EPROM to store the
system BIOS. The advantage of Flash EPROM is the EPROM chip does not
have to be replaced to update the BIOS. The end user can actually reprogram
the BIOS, using a ROM file supplied by American Megatrends.
Programming the Flash EPROM
Step Action
1 Turn power off. Make sure the computer has a working speaker.
2 Insert the floppy disk with the S772P.ROM file in drive A:.
3 Before DOS boots, press and hold down the <Ctrl> and <Home> keys to
reprogram the Flash EPROM-based AMIBIOS. The bootblock code immediately
reads the A: drive, looking for the new BIOS information.
4 When the flash ROM has successfully been programmed, the computer will
reboot.
Bootblock BIOS Actions When you reprogram from system boot, the bootblock BIOS code:
Reads S772P.ROM from the root directory of the floppy disk in drive A:.
Erases the Flash EPROM.
Programs the Flash EPROM with the data read from the floppy disk in drive
A:.
Generates a CPU reset, rebooting the computer.
The bootblock part of the Flash EPROM is not programmed. Should you
inadvertently open the disk drive door or turn power off to the computer while
programming the Flash EPROM, the bootblock will be unaffected. Simply
turn power back on and begin the Flash ROM programming process again.
Cont’d