Bios Data Areas - IBM PC CONVERTIBLE Technical Reference

BIOS Data Areas
0000
0000 04 [
0008 04 [
0010 ????
0012 ??
0080
0040
0020
=
0010
=
0002
=
0001
0013 ????
0015 ??
=
0080
=
0040
= 0020
-
-
--
-
-
-- -
-
-
--
-
-
-
-
-
-
--
-
- - - - - -
-
- - - - -
-
-
- - --
; ROM BIOS DATA AREAS
DATA SEGMENT AT 40H
RS23LBASE
DW 4 DUP(?) ADDR RS232 ADA (COM1-COM4)
????
PRINTEILBASE
ow
4 DUP(?) AD DR PRINTERS (LPTl-LPT3)
????
EQUIPMENT WORD
OW ; INSTALLED HARDWARE
I
15-14
I
13
I
12
I
11-9
I
8
I
7 -6
I
5-4
I
3-1
I
0
I
I
I
IPL DSKT INSTALLED
-- UNUSED
INITIAL VIDEO MODE
NUMBER OF DISKETTE DRIVES
UNUSED
NUMBER OF COM DEVICES
-- JOYSTICK ATTACHED
INTERNAL MODEM INSTALLED
NUMBER OF PRINTERS ATTACHED
POST STATUS FLAG
POSLSTATUS DB POST ERROR FLAGS AND STATUS
(DURING POST)
FATAL_ERROR
EQU 80H POST DETCD FATAL SYS ERROR
NON-FATAL_ERR
EQU
40H POST HAS DETECTED AN ERROR
(NON_FATAL)
BAD_RTCMEM
EQU
20H RTC MEMORY BAD - DO NOT USE
FEATURE_ERROR
EQU 10H
FEAT DEV FAILED (ROM_SCAN)
MFG~ODE EQU 02H MANUFACTURING MODE ACTIVE
POSLACTlVE EQU 01H POST IS CURRENTLY ACTIVE
M E M 0 R Y S I Z ( 1 K B Y T E S )
MEMORLSIZE DW
; MEMORY SIZE IN K BYTES
BATTERY CONTROL FLAGS
BALSTATUS DB BATTERY SUPPORT STATUS
LOW_BALSIG
EQU
80H LOW BATTERY SIGNALLED FLAG
LOW_BALHOLO
EQU
40H LOW BATTERY KEY HOLD STATE
LOW_BALPEND
EQU
20H LOW BAT PENDING SECOND SENSE
ROM BIOS 2-17