Online HelpPC 2.10 Quick Reference Utility Copyright 1991 David Jurgens
INT 15,21 - Power On Self Test (POST) Error Log (PS/2 except 30)
AH = 21h
AL = 00 read POST error log
= 01 write error code to POST error log
BH = Device code (if write)
BL = Device error (if write)
on return
CF = 0 if successful
= 1 if in error (AH contains code)
if reading POST error log:
AH = 00h if successful
= 80h (PCjr and PC) = 86h for all other machines
BX = number of POST error codes stored
ES:DI pointer to POST error log
if writing POST error log:
AH = 00h if successful = 01 POST error log full
= 80h (PCjr and PC) = 86h for all other machines
[helppc.bosbyte.nl] int 15,21