IBM AT 5170 Technical Reference page 202

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ADDRESS: 0040: 0000
BASE ADDRESSES OF RSZ32 ADAPTERS
SECOND LOG I CAL RS23Z ADAPTER
RESERVED
RESERVED
BASE ADDRESSES OF PR
I
NTER ADAPTERS
SECOND LOG I CAL PR I NTER ADAPTER
TH I RD LOG I CAL PR I NTER ADAPTER
RESERVED
INSTALLED HARDWARE FLAGS
INITIALIZATION FLAGS
BASE
~E~ORY
SIZE IN K BYTES IX 1024)
SCRATCHPAD FOR MANUFACTURING
ERROR CODES
KEYBOARD SHIFT STATE AND STATUS FLAGS
SECOND BYTE OF KEYBOARD STATUS
STORAGE FOR ALTERNATE KEY PAD ENTRY
PO I NTER TO HEAD OF KEYBOARD BUFFER
POINTER TO TAIL OF KEYBOARD BUFFER
THE BUFFER IS EMPTY
ROOM FOR 1 5 SCAN CODE ENTR I ES
DRIVE RECALIBRATION STATUS
BIT 3-0 : DRIVE 3-0 RECALIBRATION
BEFORE NEXT SEEK IF BIT IS : 0
MOTOR STATUS
BIT 3-0 : DRIVE 3-0 CURRENTLY RUNNING
BIT 1 : CURRENT OPERATION I S A WRITE
TIME OUT COUNTER FOR MOTORIS) TURN OFF
RETURN CODE STATUS BYTE
CMD BLOCK IN STACK FOR DISK OPERATION
STA"fUS BYTES FROM DISKETTE OPERATION
CURRENT DISPLAY MODE (TYPE)
NUMBER OF COLUMNS ON SCREEN
LENGTH OF REGEN BUFFER I N BYTES
STARTING ADDRESS IN REGEN BUFFER
CURSOR FOR EACH OF UP TO 8 PAGES
CURRENT CURSOR MODE SETTING
CURRENT PAGE BEING DISPLAYED
BASE ADDRESS FOR ACTIVE DISPLAY CARD
CURRENT SETTING OF THE 3xa REGISTER
CURRENT PALETTE SETT I NG - COLOR CARD
STACK SAVE, etc.
POINTER TO ROM INITIALIZATION ROUTINE
POINTER TO I/O ROM SEGMENT
FLAG INDICATING AN INTERRUPT HAPPENED
LOW WORD OF T I MER COUNT
HIGH WORD OF TIMER COUNT
TIMER HAS ROLLED OVER SINCE LAST READ
BIT 1:1 IF BREAK KEY HAS BEEN PRESSED
WORD: I 234H
I
F KEYBOARD RESET UNDERWA Y
FIXED DISK STATUS
COUNT OF FIXED DISK DRIVES
HEAO CONTROL BYTE
RESERVED (PORT OFFSET)
5-30 TESTl