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Chapter 2 - Installation
2.6
ADDING EXTENDED BIOS
The XVME-678/688 has one 256Kx8 EPROM that can represent the entire IBM BIOS range. The device
address is the physical address which is viewed from an EPROM programmer such as a Data I/O. The
system address is the address the code appears at when plugged into the EPROM site on the XVME-
678/688, as addressed by the 80386SX processor.
A diagram of the XVME-678/688 and EPROM programmer addresses is shown below:
Device Address
30000-3FFFFF
20000-2FFFF
10000-1 FFFF
08000-0FFFF
00000-07FFF
System BIOS
64K
Diagnostics
64K
User Area
64K
User Area
32K
Video BIOS
32K
System Address
FOOOO-FFFFF
EOOOO-OEFFFF
DOOOO-DFFFF
CBOOO-CFFFF
COOOO-C7FFF
Adding on-board extended BIOS to the XVME-678/688 involves two major steps: programming the
EPROM and setting the Extended BIOS Setup Menu.
Programming the EPROM
Before beginning, make sure your EPROM programmer supports 2-Mbit devices.
1.
Remove the 32-pin EPROM from socket U8.
2.
Place the EPROM into the EPROM programmer's socket.
3.
Load the EPROM into the RAM of the programmer. Set the starting address at
OH.
4.
Remove the EPROM from the socket.
2-20
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