BDOS Function Summary
CP/M 2.2, CP/M 3.0, MP/M 2.1
Compiled by Jim Lopushinsky
Notation:
.something means the address of something.
/-----CP/M 2.2
| /---CP/M 3.0
| | /-MP/M 2.1
| | | INPUT RETURNED
FUNC v v v FUNCTION NAME PARAMETERS VALUES
0 X X X System Reset none none
1 X X X Console Input none A = char
2 X X X Console Output E = char none
3 X X - Auxiliary Input none A = char
3 - - X Raw Console Input none A = char
4 X X - Auxiliary Output E = char none
4 - - X Raw Console Output E = char none
5 X X X List Output E = char none
6 X X X Direct Console I/O E = 0FFH/ A = char/
0FEH/ status/
0FDH/ none
char
7 X - - Get I/O Byte none A = IOBYTE
7 - X - Auxiliary Input Status none A = 00/0FFH
8 X - - Set I/O Byte E = IOBYTE none
8 - X - Auxiliary Output Status none A = 00/0FFH
9 X X X Print String DE = .String none
10 X X X Read Console Buffer DE = .Buffer Characters in
buffer
11 X X X Get Console Status none A = 00/01
12 X X X Return Version Number none HL = Version
13 X X X Reset Disk System none see def
14 X X X Select Disk E = Disk Number see def
15 X X X Open File DE = .FCB A = Dir Code
16 X X X Close File DE = .FCB A = Dir Code
17 X X X Search for First DE = .FCB A = Dir Code
18 X X X Search for Next none A = Dir Code
19 X X X Delete File DE = .FCB A = Dir Code
20 X X X Read Sequential DE = .FCB A = Err Code
21 X X X Write Sequential DE = .FCB A = Err Code
22 X X X Make File DE = .FCB A = Dir Code
23 X X X Rename File DE = .FCB A = Dir Code
24 X X X Return Login Vector none HL= Login Vector
25 X X X Return Current Disk none A = Cur Disk #
26 X X X Set DMA Address DE = .DMA none
27 X X X Get Addr (Alloc) none HL= .Alloc
28 X X X Write Protect Disk none none
29 X X X Get R/O Vector none HL= R/O Vector
30 X X X Set File Attributes DE = .FCB A = Dir Code
31 X X X Get Addr (DPB) none HL= .DPB
32 X X X Set/Get User Code E = 0FFH/ A = Curr User/
user number none
33 X X X Read Random DE = .FCB A = Err Code
34 X X X Write Random DE = .FCB A = Err Code
35 X X X Compute File Size DE = .FCB r0, r1, r2
36 X X X Set Random Record DE = .FCB r0, r1, r2
37 X X X Reset Drive DE = Drive A = Err Code
Vector
38 - X X Access Drive DE = Drive none
Vector
39 - X X Free Drive DE = Drive none
Vector
40 X X X Write Random with Zero Fill DE = .FCB A = Err Code
41 - - X Test and Write Record DE = .FCB HL= Err Code
41 - X - Test and Write Record DE = .FCB A = 0FFH
42 - X X Lock Record DE = .FCB HL = Err Code
43 - X X Unlock Record DE = .FCB HL = Err Code
44 - X X Set Multi-sector Count E = # Sectors A = Return Code
45 - X X Set BDOS Error Mode E = Err Mode none
46 - X X Get Disk Free Space E = Drive # Number of Free
Sectors
47 - X X Chain to Program E = Chain Flg none
48 - X X Flush Buffers E = Purge Flg A = Err Flag
49 - X - Get/Set System Control DE = .SCB PB A = Returned Byte
Block HL= Returned Word
50 - X - Direct Bios Calls DE = .BIOS PB BIOS Return
59 - X - Load Overlay DE = .FCB A = Err Code
60 - X - Call Resident System DE = .RSX PB A = Err Code
Extension
98 - X - Free Blocks none none
99 - X - Truncate File DE = .FCB A = Dir Code
100 - X X Set Directory Label DE = .FCB A = Dir Code
101 - X X Return Directory Label Data E = Drive A = Label Data
102 - X X Read File Date Stamps DE = .FCB A = Dir Code
and Password Mode
103 - X X Write File XFCB DE = .FCB A = Dir Code
104 - X X Set Date and Time DE = .DAT none
105 - X X Get Date and Time DE = .DAT Date and Time
A = seconds
106 - X X Set Default Password DE = .Passwrd none
107 - X X Return Serial Number DE = .Serial # Serial Number
field
108 - X - Get/Set Program Return Code DE = 0FFFFH/ HL= Ret Code/
Code none
109 - X - Get/Set Console Mode DE = 0FFFFH/ HL= Console Mode/
Mode none
110 - X - Get/Set Output Delimiter DE = 0FFFFH/ A = Output Delim/
E = Delimiter none
111 - X - Print Block DE = .CCB none
112 - X - List Block DE = .CCB none
128 - - X Absolute Memory Request DE = .MD A = Err Code
129 - - X Relocatable Memory Request DE = .MD A = Err Code
130 - - X Memory Free DE = .MD none
131 - - X Poll E = Device none
132 - - X Flag Wait E = Flag A = Err Code
133 - - X Flag Set E = Flag A = Err Code
134 - - X Make Queue DE = .QCB none
135 - - X Open Queue DE = .UQCB A = Err Code
136 - - X Delete Queue DE = .QCB A = Err Code
137 - - X Read Queue DE = .UQCB none
138 - - X Conditional Read Queue DE = .UQCB A = Err Code
139 - - X Write Queue DE = .UQCB none
140 - - X Conditional Write Queue DE = .UQCB A = Err Code
141 - - X Delay DE = # ticks none
142 - - X Dispatch none none
143 - - X Terminate Process E = Term. Code none
144 - - X Create Process DE = .PD none
145 - - X Set Priority E = Priority none
146 - - X Attach Console none none
147 - - X Detach Console none none
148 - - X Set Console E = Console none
149 - - X Assign Console DE = .APB A = Err Code
150 - - X Send CLI Command DE = .CLICMD none
151 - - X Call Resident Sys Proc DE = .CPB HL= result
152 - X X Parse Filename DE = .PFCB see def
153 - - X Get Console Number none A = Console #
154 - - X System Data Address none HL= Sys Data Addr
155 - - X Get Date and Time DE = .TOD date and time
156 - - X Return Process Descriptor none HL= PD Addr
157 - - X Abort Specified Process DE = .ABT PB A = Err Code
158 - - X Attach List none none
159 - - X Detach List none none
160 - - X Set List E = List # none
161 - - X Conditional Attach List none A = Err Code
162 - - X Conditional Attach Console none A = Err Code
163 - - X MPM Version Number none HL= Version #
164 - - X Get List Number none A = List #
