Appendix K
K.1 COMPARISONS BETWEEN MS-DOS AND CP/M-86
FUNCTION NR MSDOS(AH) CPM-86(CL)
Terminate 0 NC DL=0 =>back to CCP
DL=1 =>remain in
memory
Conin 1 Returns: Returns:
AL=ascii char AL=ascii char
checks are made checks are made
input is echoed input is echoed
Conout 2 DL is char DL is char
Aux /rdr 3 Returns: Returns:
AL is char AL is char
Aux/pun 4 DL is char DL is char
Print 5 DL is char DL is char
Dir Con I/O 6 DL=FF=>Cons input DL=FF=>Cons input
Returns: Returns:
AL=00=>no char AL=cons char
AL<>00=>Cons char DL=FE=>Cons stat
DL<>FF=>Cons output Returns:
DL is char AL=00=>no char
DLcons output
DL is char
Dir con Input / 7 Return AL=char Returns:
Get I/O byte AL=IOBYTE
Conin,No Echo/ 8 See func 1 DL=IOBYTE
Set I/O byte
Print String 9 DS:DX=[charstr$] DX=[charstr$]
uses func 2
Read console A DS:DX=[datalen, DX=[datalen,
Buffer inlen,data..] inlen, data..]
last char always CR CR not in data
inlen doesn't
include CR.
Editing functions
apply.
Constat B Returns: Returns:
AL=FF=>char AL=01=>char
=00=>no char =00=>no char
Conin with flush/ C Flush buffer then Returns:
Get version no. do function 1,6,7,8 BX=version
or A if in AL.
See above for
parameters
Disc reset (system) D Set A, flushes Select A and
buffers makes all R/W
Select disc E DL=drive DL=drive
Returns:
AL=number of drives
Open file F DS:DX=[FCBu] DX=[FCBu]
FCB (E,F,20)=00H FCB(C)=0
Returns: Returns:
AL=00=>Okay AL=00=>Okay
=FF=>not found =FF=>not found
Close file 10 DS:DX=[FCBo] DX=[FCBo]
Returns: Returns:
AL=00=>Okay AL=(0,1,2,3)=>Ok
=FF=>not found =FF=>not found
Search 1st entry 11 DS:DX=[FCBu] DX=[FCBu]
Return: Return:
AL=FF=>not found AL=FF=>not found
2 FCB's: extended, AL=(0,1,2,3)=> Okay
normal Curr DMA=dir record
Search next entry 12 DS:DX=[FCB] see 11 Must be preceded
Return: by 11 or 12.
AL=FF=>not found See 11 for return
Delete file 13 DS:DX=[FCBu] DX=[FCB]
Return: Return:
AL=FF=>not found AL=FF=not found
=00=>okay =00=>okay
Read sequential 14 DS:DX=[FCBo] DX=[FCBo]
Return: Return:
AL=00=>okay AL=00=>okay
=01=>no data =01=>eof-no data
=02=>not enough mem
=03=>partial record
Into current Into current DMA
transfer address
Write seg. 15 DS:DX=[FCBo] DX=[FCBo]
Return: Return:
AL=00 AL=00=>okay
=01=>disc full =01=>dir full
=02=>not enough =02=>data full
memory
Make file 16 DS:DX=[FCBu] DX=[FCBu]
Return: Return:
AL=00 AL=00,01,02,03=>Ok
=FF=>no dir.space
Inits to zero len Inits to zero
file len file
Rename file 17 DS:DX=[FCBr] DX=[FCBr]
Return: Return:
AL=00>ok AL=00=>ok
=FF=>not found =FF=>not found
DS:DX+11H=new filename DX+10H=new filename
"?"supported unambiguous filename
Not defined / 18 ND Return:
Return login vect BX=login vector
for discs
Current disc 19 Return: Return:
AL=current sel drive AL=current disc
0=>A,... 0=>A,...
Set disc xfr / 1A DS:DX=disc DX=DMA offset
addr set DMA transfer addr
offset
Allocation table/ 1B Return: Return:
vector DS:BX=allocation table ES:BX=allocation vector
DX=alloc unit count
AL=records per
alloc unit
CX=sector size
Not defined / 1C ND No parameters
writ prot. disc
/Get R/O vector 1D ND BX=R/O Vector
/Set file 1E ND DX=[FCB]
attributes with attributes set
Return:
AL=00=>ok
=FF=>not found
/Get disc 1F ND ES:BX=[disc parameters]
parameter
/Set/get user 20 ND DL=FF=>gets user code
code 0->F=>set user code
Return:
AL=current code
if FF in DL
Random read 21 DS:DX=[FCBo] DX=[FCBo]
Return: Return:
AL=00=>ok AL=00=>ok
01=>no more data 01=>read unwritten.
02=>not enough mem 02=>NC
03=>partial 03=>can't close ext.
04=>unwritten extent
05=>NC
06=>out of range
Random write 22 DS:DX[FCBo] DX=[FCBo]
Return: Return:
AL=00=>ok AL=00=>ok
01=>disc full 01=>NC
02=>not enough mem 02=>no avail data
03=>can't close ext
04=>NC
05=>no dir space
06=>out of range
File size 23 DS:DX=[FCBu] DX=[FCB]random
Return: Return:
AL=00=>ok AL=00=>ok
=FF=>not found FF=>not found
Random record set Random record set
Set random rec 24 DS:DX=[FCBo] DX=[FCBo]
Set random record Set random record
in record FCB= in record FCB=
current blocks next sequential
Set vector / 25 AL=interrupt to set DX=drive vector
Reset drive DS:DX=vector values return AL=00
Create program/ 26 DX=new prog segment ND
Random block rd/ 27 DS:DX=[FCBo] ND
CX=record count
Return:
01=>eof, complete
02=>not enough mem.
03=>eof,partial
CX=record count of read
FCB updated
Random block wrt 28 See 27 except See 22 DX=[FCBo]
Return: Zero fills data
AL=01=>no disc space block
If CX=0=>set file
size to random record
Parse file name/ 29 DS:SI=[string,cr]source ND
ES:DI=[FCBu] destination
AL=0=>no scan off
reading gaps
1=>scan off
FCBu is created
Return:
AL=00=>ok
AL=01=>ok, ? Or * present
DS:SI=[name]
ES:DI=[blank] if no name
Get date / 2A Return: ND
CX=year
DH=month
DL=day
Set date/ 2B CX,DX as 2A ND
Get time/ 2C CH=hour ND
CL=min
DH=sec
DL=1/100ths
Set time/ 2D CX,DX as 2C ND
Set/Reset verify 2E DL=0 ND
flag/
/Direct Bios call 32 ND DX=[parameter block]
/Set DMA base 33 ND DX=DMA base
/Get DMA base 34 ND Return:
ES:BX=DMA base
/Get max mem 35 ND DX=[MCB]
Return:
AL=00=>Ok
=FF=>no mem.
/Get ABS max 36 ND DX=[MCB]
Return:
as for 35
/Alloc. mem 37 ND DX=[MCB]
Return:
AL=00=>Ok
=FF=>insuff. mem.
/Alloc ABS mem 38 ND DX=[MCB]
Return:
as for 37
/Free mem 39 ND DX=[MCB]
/Free all mem 3A ND No parameters
/Program Load 3B ND DX=[FCBo]
ret AX=FFFFH=>
bad load else
AX=base page
BX=base page.
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