IBM PC CONVERTIBLE Technical Reference page 192

0373 74 ID
0375 FE OE 0040 R
JE
DEC
JNZ
T6
MOTOILCOUNT
T6 0379 75 17
037B E4 77
037D A8 80
037F 74 06
0381 24 BF
0383 OC 20
0385 E6 77
; RETURN I F COUNT NOT OUT
DEGATE DISKETTE DRIVES BEFORE TURNING OFF MOTOR TO INSURE THAT A
RE-SELECT OF A DRIVE WITHIN 800 USECS OF MTR OFF WILL NOT GLITCH DRV
LINES
IN
TEST
JZ
AND
OR
OUT
AL, DSKLCNTL
AL,DSKLNMI
T5A
AL ,NOT FDLPWR
AL, DSKLDEGATE
DSKLCNTL, AL
DEGATE DISKETTE DRIVES
DISKETTE POWER NMIS ENABLED?
JUMP I F NOT
ONLY DEGATE IF NMI ENABLED
TURN OFF DISKETTE MOTORS AND DESELECT DRIVE
0387
80 26 003F R CO T5A: AND MOTOILSTATUS,OCOH ; TURN OFF MTR STATUS BITS
038C
BO 04
038E BA 03F2
0391 EE
0392
0392 CD lC
0394 BO 20
0396 E6 20
0398
BO OB
039A E6 20
039C E4 20
039E OA CO
03AO 75 OE
03A2 F6 06 OOAO
03A7
74 07
03A9 80 26 OOAO
03AE CD 4A
03BO
03BO 5A
03Bl
58
03B2 IF
03B3 CF
03B4
03B4
MOV AL, FDLRUN ; TRN OFF MTRS SLCTS & DMAII NTS
MOV
DX,DRIVE_CNTL
OUT
DX,AL
T6:
INT
lCH XSFER CONTROL TO A USER RTNE
END OF INTERRUPT
MOV
OUT
AL,EOI
INTAOO,AL ; END OF INTERRUPT TO CNTLR
CHECK FOR ANY OTHER INTERRUPTS IN SERVICE
MOV
AL, READ_I SR
SET TO READ INSERVICE REG
OUT INTAOO,AL
IN AL,INTAOO READ IN-SERVICE-REG
OR AL,AL ANYTHING IN SERVICE?
JNZ T7 YES, ALARM SERVICE MUST WAIT
CHECK FOR USER RTC ALARM ROUTINE PENDING ACTIVATION
R 02 TEST RTLWAILFLAG,ALARM_PEND ; ALRM INTERRUPT PENDING?
JZ T7 ; JUMP IF NOT
CALL USER ALARM ROUTINE DUE TO RTC ALARM PENDING FLAG BEING SET
R FD
AND RTLWAILFLAG, NOT
ALAR~PEND
; TURN OFF FLAG
INT 4AH
T7 :
POP DX
POP AX
POP DS
IRET
TMRO_INT8
ROMCODE ENDS
END
; XSFER CTOL TO USR ALARM RTNE
RESET MACHINE STATE
RETURN FROM INTERRUPT
ENDP
ROM BIOS 2-167