0803R.ROM is patched ACPI 0803 bios for 900HA - to install MacOSX Leopard for example
0803.ROM is original rom
AFUDOS.EXE is a bios flash utility which can flash older bios version on your EEEPC

dsdt.aml is a DSDT file for the 900HA with 0803 bios and the specific parts and hardware which were on my 900HA laptop. You'll be lucky if it works OK on your 900HA 8-). 