IBM XT 5160 - Page 227

IBM Personal Computer MACRO Assembler Version 2.00
B I OS I ---- 01/ 10/86 INTERRUPT 15H B I OS ROUTI NES
I-I
01-10-86
ASSUME
CS:CODE
0000
CASSETTE
10_1
PROC FAR
0000 FB
STI
ENABLE INTERRUPTS
000 I 80 FC 80
CMP
AH,080H
CHECK FOR RANGE OF 00-7FH
0004 73 06
JAE
Cl
-
G
SK I P AND
HANDLE, ELSE RETURN ERROR
0006
Cl :
ERROR
0006 B4 86
MOV
AH,86H
SET BAD COMMAND
0008 F9
STC
SET CARRY FLAG ON (CY:l )
0009
CI
-
F:
COMMON EXIT
0009 CA 0002
RET
FAR RETURN EXIT FROM ROUTINES
OOOC
Cl
-
G:
CONT I NUE CHECK I NG FOR FUNCT I ON
OOOC 80 FC CO
CMP
AH,OCOH
CHECK FOR CONF I GURAT I ON PARAMETERS
OOOF 74 2E
JE
CONF_PARMS
(AH) : OOH
(AH) : OIH
(AH) : 02H
(AH) : 03H
RETURNS FOR THESE FUNCTI ONS ALWAYS (AH) : 86H, CY : I)
I F CASSETTE PORT NOT PRESENT
; - -- - - - - - - - - - - -- - - - -- ---- -- - - - - - - -- - - - -- --- - - - - - - - - - --- - - - - - --- - ----- - -- ----- - - I
; INPUT - UNUSED FUNCT IONS :
;
(AH I : 04H THROUGH 7FH :
; RETURNS FOR
THESE FUNCT IONS ALWAYS (AH) : 86H, CY : 1) :
;
(UNLESS I NTERCEPTED BY SYSTEM HANDLERS) :
NOTE: THE KEYBOARD I NTERRUPT HANDLER INTERRUPTS WITH AH:4FH :
TIMEOUT
LENGTH OF FOLLOW I NG TABLE
SYSTEM MODEL BYTE
SYSTEM MODEL TYPE BYTE
BIOS REVISION LEVEL
10000000 : DMA CHANNEL 3 USE BY B I OS
01000000 : CASCADED I NTERRUPT LEVEL 2
00 I 00000 : REAL T I ME CLOCK AVA I LABLE
00010000 : KEYBOARD SCAN CODE HOOK 1 AH
RESERVED
RESERVED
RESERVED
RESERVED
;
SYSTEM/BIOS CONFIGURATION TABLE
; LOAD (OS) WITH OATA SEGMENT SELECTOR
DESCR I
PT I ON TYPE
I NTERRUPT COMPLETE FLAG SET
( AL I TYPE CODE
OOH -> 7FH
SER I ALL Y REUSABLE DEV ICES
OPERATI NG SYSTEM MUST SER I ALI ZE ACCESS
80H -> BFH
REENTRANT DEV ICES; ES: BX I S USED TO
01 STI NGU ISH 0 I FFERENT CALLS (MULTI PLE I /0
CALLS ARE ALLOWED S IMUL TANEOUSL Y)
COH -> FFH
WA I T ONLY CALLS -- THERE I S NO
COMPLEMENTARY 'POST' FOR THESE WA I TS •
THESE ARE TIMEOUT ONLY. TIMES ARE
FUNCT I
ON NUMBER DEPENDENT.
JOYSTI CK SUPPORT
(OX) : OOH - READ THE CURRENT SW ITCH SETT I NGS
RETURNS
AL : SW ITCH SETT I NGS (B I TS 7 -4)
(OX) : 0 I H - READ THE RES I STI VE INPUTS
RETURNS AX : A ( x) VALUE
BX : A ( y) VALUE
CX : B ( x) VALUE
OX : B ( y) VALUE
EXTENDED MEMORY SIZE DETERM I NE
EVENT WAIT (NULL)
PROGRAM TERM I NAT I ON (NULL)
(BX) : DEVICE 10
DEV I CE CLOSE (NULL I
(BX) : DEVICE 10
(CX) : PROCESS 10
DB
DB
DB
DB
OW 8
DB MODEL BYTE
DB TYPE BYTE
DB B lOS-LEVEL
DB ? -
(AH) : 88H
(AHI : 91H
(AHI : 83H
(AHI : 84H
(AH) : 82H
(AH) : 81H
I NT 15 H - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ---- - - - - - - - - ---- --- - ----- - -- ---
INPUT - CASSETTE I/O FUNCTI ONS :
:
:
:
:
:
:
:
; - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -- - - - - - ------ --- - - - - ------- - - -- - - - - -- -- - - - - -- I
; EXTENS IONS
; (AH) : 80H DEVICE OPEN (NULL)
; (BX ) : DEV I CE 10
(CX) : PROCESS 10
;
;
;
;
;
;
OOH : DISK YES
o1H : 0 I SKETTE YES
02H : KEYBOARD NO
80H : NETWORK NO
ES:BX --> NCB
FDH : 0 I SKETTE MOTOR START YES
FEH : PR I NTER YES
(AH) : COH RETURN CONFIGURATION PARAMETERS POINTER
RETURNS
(AH) : OOH AND CY: 0 (I F PRESENT ELSE 86 AND CY: 1)
(ES: BX) : PARAMETER TABLE ADDRESS PO INTER
WHERE:
PAGE
118,121
TITLE BIOSI ---- 01/10/86 INTERRUPT 15H BIOS ROUTINES
.LlST
CODE SEGMENT BYTE PUBL I C
PUBL I C CASSETTE_IO_I
EXTRN CONF TBL: NEAR
EXTRN DDS: NEAR
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BIOSI (01/10/86)