INT 15,C1 - Return Extended BIOS Data Area Segment (PS/2 only)

AH = C1

on return:

CF = 0 if successful

= 1 if error

AH = when CF set, 80h for PC & PCjr, 86h for XT (BIOS 11/8/82)

ES = ~EBDA~ segment address if PS/2

- the EBDA is used internally by the PS/2 BIOS routines

- the EBDA is allocated at the top of user memory by the ~POST~

routine