IBM XT 5160 - Page 194

PUSH SI
CLI
MOV BX, [OBUFFER_TAIL); GET THE "IN TO" POINTER TO THE BUFFER
MOV S I ,BX ; SAVE A COPY I N CASE BUFFER NOT FULL
CALL K4 ; BUMP THE PO I NTER TO SEE I F BUFFER I S FULL
CMP BX, [OBUFFER HEAD); WILL THE BUFFER OVERRUN I F WE STORE TH IS?
.JE K502 -, YES - I NFORM CALLER OF ERROR
MOV [S I ) ,CX ; NO - PUT THE ASC I I I SCAN CODE I NTO BUFFER
MOV [OBUFFER TAIL) ,BX; AD.JUST "IN TO" POINTER TO REFLECT CHANGE
SUB
AL,AL - ; TELL CALLER THAT OPERATION WAS SUCCESSFUL
.JMP K504 ; SUB I NSTRUCT I ON ALSO RESETS CARRY FLAG
; ------ ASC I I STATUS
5-47
1-2
01-10-86
BUFFER FULL I NO I CAT I ON
RETURN TO CALLER WITH STATUS IN AL
GET THE EXTENDED SHIFT STATUS FLAGS
GET SYSTEM SHIFT KEY STATUS
MASK ALL BUT SYS KEY BIT
SH I FT THE SYSTEM KEY BIT OVER TO
BIT 7 POSITION
GET SHIFT STATES BACK
~~~~~ N~~~ ~~~A~~: ~6' B 7~;DT~i~T;H AND I NS_SH I FT
GET RIGHT CTL AND AL T
ELIMINATE LC EO AND LC EI
OR THE SH I FT-FLAGS TOGETHER
GET THE
SHIFT STATUS FLAGS
RETURN TO CALLER
TEST FOR CHARACTER I N BUFFER (EXTENDED)
RETURN I F BUFFER EMPTV
SAVE ZF FROM TEST
ROUT I NE TO XLATE FOR EXTENDED CALLS
GIVE I T TO THE CALLER
TEST FOR CHARACTER I N BUFFER
RETURN I F BUFFER EMPTY
SAVE
ZF FROM TEST
ROUTINE TO XLATE FOR STANDARD CALLS
CARRY CLEAR MEANS PASS VAL I 0 CODE
I
NVAL I 0 CODE FOR TH I S TYPE OF CALL
THROW THE CHARACTER AWAY
GO LOOK FOR NEXT CHAR, I F ANY
RESTORE
ZF FROM TEST
RECOVER REG I STER
RECOVER SEGMENT
THROW AWAY FLAGS
KEYBOARD (01/10/86)
AL,OIH
AH ,OKB FLAG I
AH,SYS-SHIFT
CL,5 -
AH,CL
AL ,OKB FLAG I
AL,OllToOIIB
AH,AL
AL ,OKB FLAG 3
AL,OOOOIIOOB
AH,AL
AL,OKB FLAG
KIO_EXTT
MOV
MOV
AND
MOV
SHL
MOV
AND
OR
MOV
AND
OR
MOV
.JMP
CALL K2S
.JZ K2B
PUSHF
CALL K lOS XLA T
.JNC K2A- -
POPF
CALL K I S
.JMP K2
POPF
POP CX
POP BX
POP
OS
RET 2
CALL K2S
.JZ K2B
PUSHF
CALL K 10 E XL AT
.JMP SHORT-K2A
K502:
K504:
; ------ WR I TE TO KEYBOARD BUFFER
K500:
K3:
; ------ SH I FT STATUS
K3E:
K2A:
K2B:
K2:
K2E:
115
116
I 17 003B E8 00C4 R
118 003E74 18
119 0040 9C
120 0041 E8 0001 R
121
0044 EB II
122
123
0046 E8 00C4 R
124 0049 74 00
125 004B 9C
126 004C E8 OODC R
127 004F 73 06
128 0051 90
129 0052 E8 009E R
130 0055 EB EF
131
132 0057 90
133 0058 59
134 0059 5B
135 005A IF
136 005B CA 0002
137
138
139
140 005E
141 005E 8A 26 0018 R
142 0062 80 E4 04
143 0065 BI 05
144 0067 02 E4
145 0069 AO 00 I 8 R
146 006C 24 73
147 006E OA EO
148 0070 AO 0096 R
149 0073 24 OC
150 0075 OA EO
151 0077 AO 0017 R
152 007A EB A9
153
154
155
156
007C
157 007C 56
158 0070 FA
159 007E 8B IE OOIC R
160 0082 8B F3
161 0084 E8 0 I 14 R
162 0087 3B IE OOIA R
163 008B 74 OB
164 0080 89 OC
165 008F 89 IE OOIC R
166 0093 2A CO
167 0095 EB 03 90
168 0098
169 0098 BO 0 I
170 009A
171 009A FB
172 009B 5E
173 009C EB 87
174
175 009E
IBM Personal Computer MACRO Assembler Version 2.00
KEYBRD - - - 0 I 110/86 KEYBOARD ADAPTER B I OS