IBM PC CONVERTIBLE

038E
0393
0394
0394
0395
039A
039B
039C
039D
039D
039D
039E
039F
03A2
03A7
03A9
03AB
03AE
03BO
03B1
03B2
03B3
03B3
03B3
03B4
03B7
03B8
03B9
03BB
03BB
03BD
03CO
03CO
03C1
03C3
03C5
03C7
03CC
03CC
03CD
03CE
03CF
80 OE 0041 R 80 OR
DISKETTLSTATUS, TIMLOUT; NO INTERRUPT OCCURRED ERROR
F9 STC
; ERROR RETURN
J37 :
9C PUSHF
; SAVE CURRENT CARRY
80 26 003E R 7F AND SEEICSTATUS, NOT
INLFLAG ; TURN OFF INTERRUPT FLAG
9D POPF
RECOVER CARRY
59 POP CX
C3 RET
GOOD RETURN CODE COMES
FROM TEST I NST
WAILINT ENDP
----- -- - - - -- --- - - -- -- --- - - - - - - - - -- - - - - - -- - -- - -- - - - - -- - --
,
; DSKLINTE
THIS ROUTINE HANDLES THE DISKETTE INTERRUPT
; INPUT
; NONE
; OUTPUT
THE INTERRUPT FLAG IS SET IS SEEICSTATUS
; -- -- --- - - - -- - - - - -- -- - - - ----- - - - - - - - - - - - --- - - --- - -- -- - - --
DSKLINTE PROC
FAR
1E PUSH
DS
50 PUSH AX
E8 0000 E CALL DDS
;
SET UP DATA SEGMENT
80 OE 003E R 80 OR
SEEICSTATUS,INLFLAG
BO 20
E6 20
B8 9101
CD 15
58
1F
CF
FC
BE 0042
51
52
B3 07
33 C9
BA 03F4
EC
A8 80
75 OB
E2 F9
MOV AL,EOI END OF INTERRUPT MARKER
OUT INTAOO,AL
I NTERRUPT CONTROL PORT
MOV AX,09101H
SIGNAL DEVICE OPERATION COMPLETE
INT 15H
POP AX
POP DS RECOVER SYSTEM
IRET
RETURN FROM INTERRUPT
DSKLINTE ENDP
RESULTS
INPUT
OUTPUT
THIS ROUTINE WILL READ ANYTHING THAT THE NEC CONTROLLER HAS
TO SAY FOLLOWING AN INTERRUPT.
NONE
CY = 0 SUCCESSFUL TRANSFER
CY = 1 FAILURE -- TIME OUT IN WAITING FOR STATUS
NECSTATUS AREA HAS STATUS BYTE LOADED INTO IT
(AH,BX,Si) DESTROYED
; -- - - - - - - - - - - - - - - - - - - - - - -- - - - - - ----- - - - - - - - -- --- - - - - - - - - -- -- - - - -- - - - - - - --
RESUL TS PROC NEAR
CLD
MOV SI,OFFSET NECSTATUS ; POINTER TO DATA AREA
PUSH CX SAVE COUNTER
PUSH DX
MOV BL,7
;
MAX STATUS BYTES
; ----- WAIT FOR REQUEST FOR MASTER
J38: INPULLOOP
XOR CX,CX
COUNTER
MOV
DX, FDCSTATUS
STATUS PORT
J39: WAIT FOR MASTER
IN AL,DX GET STATUS
TEST AL, REQ~ASTER MASTER READY
JNZ J40A TESLDIR
LOOP J39 ; WAILMASTER
80 OE 0041 R 80 OR DISKETTE_STATUS, TIME_OUT
J40: ; RESULTS_ERROR
F9 STC ; SET ERROR RETURN
5A POP DX
59 POP CX
C3
RET
;----- TEST THE DIRECTION BIT
ROM BIOS 2-133