IBM XT 5160 - Page 204

PAGE 118,121
TITLE PRT ------ 01/10/86 PRINTER ADAPTER BIOS
.LlST
( DX) = PR I NTER TO BE USED (0, I ,2 I CORRESPOND I NG TO ACTUAL VALUES
IN OPR I NTER BASE AREA
DATA AREA OPR I NTER BASE CONTA I NS THE BASE ADDRESS OF THE PR I NTER CARD (S I
AVA I
LABLE ( LOCATED-AT BEG I NN I NG OF DATA SEGMENT, 408H ABSOLUTE, 3 WORDS I
CODE SEGMENT
BYTE PUBL I C
PUBLIC PRINTER_IO_1
EXTRN DDS: NEAR
5-57
RETURN
RECOVER REG I
STERS
RETURN TO CALLING PROGRAM (AHI = STATUS
RETURN ERROR
BITS FOR I NVAL I D CALLS
OUTPUT CHARACTER TO DATA PORT
POINT TO STATUS PORT
TEST DX = ZERO, INDICATING NO PRINTER
EX IT, NO PR I NTER ADAPTER AT OFFSET
TEST FOR (AH) = OOH
PR I NT CHARACTER IN (AL )
TEST FOR (AHI = 01H
I N I TI ALI ZE PR INTER
TEST FOR (AH) = 02H
GET PR I NTER STATUS
ENTRY PO I NT FOR ORG OEFD2H
I NTERRUPTS BACK ON
SAVE WORK REG I STERS
CHECK FOR PR I
NTER NUMBER VAL I D 0 - 3
ERROR EX I T I F OUT OF RANGE
SAVE CHARACTER TO
BE PR I NTED
SAVE SEGMENT
ADDRESS
DATA SEGMENT
SAVE WORK PO I NTER REG I STER
GET PR I NTER PARAMETER
LOAD TIMEOUT VALUE
WORD OFF SET INTO T ABLE INTO (S I )
GET
BASE ADDRESS FOR PR I NTER CARD
RECOVER
CALLERS (S I I REG I STER
AND
(DS I SEGMENT REG I STER
I-I
01-10-86
PRINTER (01/10/86)
FAR
DX,AL
DX
BX
DX
AH,029H
AH
B80
AH
B60
AH,AH
B30
(AH) IS MODIFIED WITH STATUS INFORMATION
ALL OTHERS UNCHANGED
S I
SI,DX
BL , OPR I NT TI M OUT [ S I ]
SI,I --
DX,OPRINTER BASE[SI]
SI -
DS
DS:NOTHING
DX,DX
BIO
BH,AL
DS
DDS
DX
BX
DX,03H
BIO
PROC
OUT
INC
(AHI= 02H
POP
POP
IRET
MOV
(AHI= OOH
PR I NT THE CHARACTER IN (AL )
(AH) = OIH
OR
JZ
DEC
JZ
DEC
JZ
ASSUME CS :CODE,DS: DATA
MOV
PUSH
CALL
PUSH
MOV
MOV
SHL
MOV
POP
POP
ASSUME
OR
JZ
REGI STERS
I
NT I 7 H - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - --
PRINTER 10 :
THIS ROUTINE PROVIDES COMMUNICATION WITH THE PRINTER :
INPUT :
PR I NT THE CHARACTER IN (AL I :
ON RETURN, ( AH I = 1 I F CHARACTER NOT PR I NTED (T I ME OUT I :
OTHER BITS SET AS ON NORMAL STATUS CALL :
INITIALIZE THE PRINTER PORT :
RETURNS WITH (AHI SET WITH PRINTER STATUS :
READ THE PRINTER STATUS INTO (AHI :
7 6 5 4 3 2-1 0 :
I I I I I I 1- I = T I ME OUT :
I I I I I 1- UNUSED :
I I I I 1- 1 I /0 ERROR :
I I I '- I = SELECTED :
1 1 1_ 1 = OUT OF PAPER :
1 1 :
I 1- 1 = ACKNOWLEDGE :
'- 1 = NOT BUSY :
:
:
I
:
:
:
:
:
:
:
:
B30:
BIO:
B20:
; DATA AREA OPR I NT TIM OUT ( BYTE) MAYBE CHANGE TO CAUSE DIFFERENT
TIME OUT WAITS. DEFAULT=20
PR INTER_I 0_1
STI
PUSH
PUSH
CMP
JA
1
2
3
4
5 0000
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50 0000
51
52 0000 FB
53 0001 52
54 0002 53
55 0003 83 FA 03
56 0006 77 25
57
58 0008 8A F8
59 OOOA IE
60 OOOB E8 0000 E
61
62 OOOE 56
63 OOOF 8B F2
64 0011 8A 9C 0078 R
65 0015 Dl E6
66 00 17 8B 94 0008 R
67 001 B 5E
68 001C IF
69
70 001D OB D2
71 001F 74 OC
72
73 0021 OA E4
74 0023 74 OD
75
76
0025 FE CC
77 0027 74 4B
78
79
0029 FE CC
80 002B 74 39
81
82 002D
83 002D B4 29
84
85 002F
86 002F 5B
87 0030 5A
88 0031 CF
89
90
91
92
93
0032
94 0032 EE
95 0033 42
I BM Persona I Computer MACRO Assemb I er Vers i on 2.00
PRT ------ 01/10/86 PR I NTER ADAPTER B I OS