I was given a bunch of multibus boards many years ago. There were many iSBC 286/10 and iSBC 286/10A boards in the group.
The ROMs appear to be standard Intel boot ROMS. There are 4 27128 EPROMS. Here they are: U41-174894-001.bin. U76-174894-002.bin. U40-174894-003.bin. U75-174894-004.bin.
1212 MST 10 June 2013