Using MKBJ.EXE (it has old names in help it displays ;).

MKBJ output bootromx.bin driver.com boot-file driver-args

output		- name of file to be put in rom
driver.com	- packet drive for network card
boot-file	- name of file in SYS:LOGIN dir (can specify
		  server name, like: \\NWSERV\NET$BOOT.SYS)
driver-args	- args to be passed to the driver; one of
		  them is packet vector, and it must be 0x65

(hope it is more explanatory than one line shown by MKBJ.EXE)
