IBM 5150 PC Technical Reference (6025005, August, 1981) (PDF)

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0019 ??
OOlA ????
ODIC ????
ODIE (16 ???'?)
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0036
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0042 (7 ?? J
78 eTL_SHIFT EOU 04H ; CONTROL SHIFT KEY DEPRESSED
79 lEfT_SHIFT EOU 02H ; lEFT SHIFT KEY DEPRESSED
80 RIGHT_SHIFT EOU O1H ; RIGHT SHIFT KEY DEPRESSED
81
82 DB ; SECOND BYTE OF KEYBOARD STATUS
83
INS_SHIFT 84 EOU 80H ; INSERT KEY IS DEPRESSED
85 CAPS_SHIFT EOU 40H ; CAPS LOCK KEY IS DEPRESSED
8. HUH_SHIFT EOU 20H ; NUN LOCK KEY IS DEPRESSED
87 SCROLL_SHIFT EOU IOH SCROLL LOCK KEY IS DEPRESSEO
88 HOLD_STATE EOU 08H SUSPEND KEY HAS BEEN TOGGLED
89
90 ALT_INPUT DB STORAGE fOR ALTERNATE KEYPAD ENTRY
91 BUFFER_HEAD OW POINTER TO HEAD Of KEYBOARD BUFFER
.2 BUFFER_TAIL OW POINTER TO TAIL OF KEYBOARD BUFFER
93 KB_BUFFER OW 16 Dupe? I j ROOM FOR 15 ENTRIES
94 KB_BUFFER_EHO LABEL WORD
.5
96 j------ HEAD = TAIL INDICATES THAT THE BUFFER IS EMPTY
.7
••
••
98 NUMJEY EOU SCAN CODE FOR NUMBER LOCK
SCROLL_KEY EOU 70 SCROLL LOCK KEY
100 ALTJEY EOU 5. ALTERNATE SHIFT KEY SCAN COOE
101 CTL_KEY EOU 2. SCAN CODE FOR CONTROL KEY
102 CAPS_KEY EOU 58 SCAN CODE FOR SHIFT LOCK
103 LEFT_KEY EOU 42 SCAN CODE FOR LEFT SHIFT
104 RIGHTJEY EOU 54 SCAN COOE FOR RIGHT SHIFT
105 INS_KEY EOU 82 SCAN CODE FOR UlSERT KEY
10. DEL_KEY EOU 83 SCAN CODE FOR DELETE KEY
107
108 j -------------------------------------------­
109 j DISKETTE DATA AREAS
110 j -------------------------------------------­
111 DB ; DRIVE RECALIBRATION STATUS
112 BIT 3-0 = DRIVE 3-0 NEEDS RECAL BEFORE
113 NEXT SEEK IF BIT IS = 0
114 INTJLAG EOU oaOH ; INTERRUPT OCCURRt:NCE FLAG
115 MOTOR_STATUS DB ; MOTOR STATUS
11. BIT 3-0 = DRIVE 3-0 IS CURRENTLY R\..INI'IIHG
117 I BIT 7 = CURRENT OPERATION IS A WRITE. REQUIRES DEU.Y
118 ttOTOR_COUNT DB ; TIME OUT COUNTER fOR DRIVE TURN OFF
MOTOR_WAIT EQU 37 ; TWO SECONDS OF COUNTS FOR I1OTOR TURN OFF
"' 120
121
122 DISKETTE_STATUS DB j SINGLE BYTE OF RETURN CooE INFO FOR STATUS
123 TIME_OUT EQU 80H ; ATTACHMENl rAILED TO RESPOND
124 BAD_SEEK EQU 40H ; SEEK OPERATION FAILED
125 BAD_NEC EQU 20H ; NEe CONTROLLER HAS FAILED
12' BAD_CRC EQU IOH j BAD CRC ON DISKETTE READ
127 DMA_BOUNDARY EqU 09H ; ATTEMPT TO DMA ACROSS 64K BOUNDARY
128 BAD_DMA EQU 08H ; DMA OVERRUN ON OPERATION
12' RECORD_NOTJND EQU 04H I REQUESTED SECTOR NOT FOUND
130 WRITE_PROTECT EQU OJH I WRITE ATTEMPTED ON WRITE PROT DISK
131 BAO ADDR_HARK EQU 02H ADDRESS MARK HOT FOUND
132 BAD_CHO EQU O1H BAD COMNAND PASSED TO DISKETTE I/O
133
134 DB 7 DUP(?) ; STATUS BYTES FROM NEC
135
0049 ??
004A ????
004C ????
004E ????
~ 0050 (8 ????I
0060 ????
0062 ??
0063 ?1?1
0065 ??
0066 ??
0067 '????
0069 ????
136 j -------------------------------------------­
137 ; VIDEO DISPLAY DATA AREA
138 ; -------------------------------------------­
139 CRT_MODE DB ; CURRENT CRT HOOE
140 CRT_COLS OW ; HUMBER OF COLUMNS ON SCREEN
141 CRT_LEN ow j LENGTH OF REGEN IN BYTES
142 CRT_START OW STARTING ADDRESS IN REGEN BUFFER
143 CURSOR_POSN ow 8 DUP{?) ; CURSOR FOR EACH OF UP TO a PAGES
144 CURSOR MODE OW CURRENT CURSOR MODE SETTING
145 ACTIVE_PAGE DB CURRENT PAGE BEING DISPLAYED
14. ADDR_684S OW BASE ADDRESS FOR ACTIVE DISPLAY CARD
147 CRT_MODE SET DB CURRENT SETTING Of 1liE 3X8 REGISTER
14B CRT_PALLETTE DB ; CURRENT PALLETTE SETTING COLOR CARD
14,
150 ; -------------------------------------------­
151 ; CASSETTE DATA AREA
152 j-------------------------------------------­
153 OW ;TIME COUNT AT DATA EDGE
154 ow JCRC REGISTER
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