Int E0  - Cp/m-86, Concurrent Cp/m, Dr Multiuser DOS - Function Calls      [O]

   CL = function number
   DS,DX = parameters

Return: as appropriate for function

Notes: several functions are covered in more detail in following entries
   most of these calls are also supported by Digital Research's DOS Plus
     v2.1; the unsupported functions are 26h,29h-2Bh,3Ah,3Dh-62h,71h-8Ch,
     90h-92h,94h-97h,9Bh-ABh, and AEh-FFh

See Also: INT 21/AX=4459h,INT 21/AH=E0h"DOS Plus"

Values for function number:
 00h   terminate calling process (see also INT 21/AH=00h)
 01h   read a character
 02h   write character to default console (see also INT 21/AH=02h)
 03h   read character from default AUX (see also INT 21/AH=03h)
 04h   write character to default AUX (see also INT 21/AH=04h)
 05h   write character to default list device (see also INT 21/AH=05h)
 06h   perform raw I/O on default console (see also INT 21/AH=06h)
 07h   return default AUX input status
 08h   return default AUX output status
 09h   write string to default console (see also INT 21/AH=09h)
 0Ah   read string from default console (see also INT 21/AH=0Ah)
 0Bh   return default console input status (see also INT 21/AH=0Bh)
 0Ch   get BDOS release ID
 0Dh   reset all disk drives (see also INT 21/AH=0Dh)
 0Eh   set default drive (see also INT 21/AH=0Eh)
 0Fh   open file via FCB (see also INT 21/AH=0Fh)
 10h   close file via FCB (see also INT 21/AH=10h)
 11h   search for first matching file with FCB (see also INT 21/AH=11h)
 12h   search for next matching file with FCB (see also INT 21/AH=12h)
 13h   delete file via FCB (see also INT 21/AH=13h)
 14h   sequential read via FCB (see also INT 21/AH=14h)
 15h   sequential write via FCB (see also INT 21/AH=15h)
 16h   create file via FCB (see also INT 21/AH=16h)
 17h   rename file via FCB (see also INT 21/AH=17h)
 18h   get bit map of logged drives
 19h   get default drive (see also INT 21/AH=19h)
 1Ah   set DMA address offset
 1Bh   get default disk allocation vector (see also INT 21/AH=1Bh)
 1Ch   set default drive to read-only
 1Dh   get bit map of read-only drives
 1Eh   set file attributes via FCB (see also INT 21/AX=4301h)
 1Fh   get address of disk parameter block (see also INT 21/AH=1Fh)
 20h   get/set default user number
 21h   read random record via FCB (see also INT 21/AH=21h)
 22h   write random record via FCB (see also INT 21/AH=22h)
 23h   compute file size with FCB (see also INT 21/AH=23h)
 24h   get FCB random record number (see also INT 21/AH=24h)
 25h   reset specified drives
 26h   access specified drives (not in DR DOS Plus v2.1)
 27h   free specified drives
 28h   write random with FCB, zero fill (see also also INT 21/AH=28h)
 2Ah   lock records in FCB file (see also INT 21/AH=5Ch)
 2Bh   unlock records in FCB file (see also INT 21/AH=5Ch)
 2Ch   set BDOS multisector count
 2Dh   set BDOS error mode
 2Eh   get free space on disk
 2Fh   load, initialize, and jump to process (see also INT 21/AH=4Bh)
 30h   flush write-deferred buffers
 31h   get/set system variable (DOS Plus v2.1)
 32h   call BIOS (XIOS) character routine (see below)
 33h   set DMA address segment
 34h   get DMA buffer address
 35h   CP/M-86 allocate maximum memory
 36h   allocate maximum memory at specified segment
 37h   CP/M-86 allocate memory segment (see also INT 21/AH=48h)
 38h   allocate memory at specified segment
 39h   CP/M-86 free specified memory segment (see also INT 21/AH=49h)
 3Ah   CP/M-86 free all memory (not in DOS Plus v2.1)
 3Bh   load .CMD file into memory
 3Ch   (DOS Plus v2.1) call RSX program
 40h   (DR-NET) log on a server
 41h   (DR-NET) log off a server
 42h   (DR-NET) send a message
 43h   (DR-NET) receive a message
 44h   (DR-NET) get network status
 45h   (DR-NET) get requestor configuration table
 46h   (DR-NET) set compatibility attributes
 47h   (DR-NET) get server configuration table
 48h   (DR-NET) set network error mode
 49h   (DR-NET) attach network
 4Ah   (DR-NET) detach network
 4Bh   (DR-NET) set default password
 4Ch   (DR-NET) get-set long timeout
 4Dh   (DR-NET) get parameter table
 50h   (DR-NET) get network information
 53h   get current time (see also INT 21/AH=2Ch)
 54h   set current time (see also INT 21/AH=2Dh)
 55h   get binary system date (see also INT 21/AH=2Ah)
 56h   set system date (see also INT 21/AH=2Bh)
 57h   allocate system flag
 58h   deallocate system flag
 59h   reserve memory in global area
 5Ah   lock physical drive
 5Bh   unlock physical drive
 5Ch   search path for executable file
 5Dh   load and execute command (see also INT 21/AH=4Bh)
 5Eh   get/set process exit code
 5Fh   set country information
 60h   get country information
 63h   truncate FCB file (see also INT 21/AH=28h)
 64h   create/update directory label
 65h   get directory label
 66h   get FCB date stamp and password mode
 67h   write extended FCB
 68h   set system date and time
 69h   get system date and time in binary
 6Ah   establish password for file access
 6Bh   get OS serial number
 6Ch   (DOS Plus v2.1) get/set program return code
 6Dh   get/set console mode
 6Eh   get/set string delimiter
 6Fh   write block to default console
 70h   write block to default list device
 71h   execute DOS-compatible function
 74h   set FCB time and date stamps
 80h   allocate memory
 82h   deallocate memory
 83h   poll I/O device
 84h   wait on system flag
 85h   set system flag
 86h   create message queue
 87h   open message queue
 88h   delete message queue
 89h   read from message queue
 8Ah   conditionally read from message queue
 8Bh   write to message queue
 8Ch   conditionally write to message queue
 8Dh   delay calling process
 8Eh   call process dispatcher (yield CPU)
 8Fh   terminate calling process (same as function 00h)
 90h   create a process
 91h   set calling process' priority
 92h   attach to default console
 93h   detach from default console
 95h   assign default console to process
 96h   interpret and execute commandline
 97h   resident procedure library
 98h   parse ASCII string into FCB (see also INT 21/AH=29h)
 99h   return default console
 9Ah   get address of system data (SYSDAT)
 9Bh   get system time and date
 9Ch   return calling process' descriptor
 9Dh   terminate process by name or PD address
 9Eh   attach to default list device
 9Fh   detach from default list device
 A0h   select default list device
 A1h   conditionally attach to default list device
 A2h   conditionally attach to default console
 A3h   get OS version number
 A4h   get default list device
 A5h   attach to default AUX
 A6h   detach from default AUX
 A7h   conditionally attach to default AUX
 A8h   set default AUX
 A9h   return default AUX
 ACh   read block from default AUX
 ADh   (DOS Plus v2.1) write block to default AUX
 B0h   configure default AUX
 B1h   get/set device control parameters
 B2h   send Break through default AUX
 B3h   allocate physical memory
 B4h   free physical memory
 B5h   map physical memory
 B6h   nondestructive message queue read
 B7h   timed wait on system flag
 B8h   get/set I/O port mapping
 B9h   set list device timeout
 BAh   set AUX timeout value
 BBh   execute XIOS service
 BDh   (DR Multiuser DOS) delay
 FFh   return 80386 to native mode

Values for DOS Plus v2.1 XIOS functions:
 00h   terminate program
 01h   ???
 02h   check for console input status
 03h   read character from console
 04h   write character to console
 05h   write character to list device
 06h   write character to auxiliary device
 07h   read cahracter from auxiliary device
 0Fh   get list device status
 10h-14h reserved
 15h   device initialization
 16h   check console output status
 17h-7Fh reserved
---BBC Acorn---
 80h   get XIOS version
 81h   get Tube semaphore
 82h   release Tube semaphore
 83h   select text/graphics
 84h   update B&W graphics rectangle
 85h   update color graphics rectangle
 86h   get/release/update mouse
 87h   get system error info
 88h   entry in CLOCK called by WatchDog RSP
 89h   BBC OSBYTE function
 8Ah   BBC OSWORD function

DR Multiuser DOS Error Return Codes:
 00h no error
 01h system call not implemented
 02h illegal system call number
 03h cannot find memory
 04h illegal flag number
 05h flag overrun
 06h flag underrun
 07h no unused Queue Descriptors
 08h no free queue buffer
 09h cannot find queue
 0Ah queue in use
 0Ch no free Process Descriptors
 0Dh no queue access
 0Eh empty queue
 0Fh full queue
 10h CLI queue missing
 11h no 8087 in system
 12h no unused Memory Descriptors
 13h illegal console number
 14h no Process Descriptor match
 15h no console match
 16h no CLI process
 17h illegal disk number
 18h illegal filename
 19h illegal filetype
 1Ah character not ready
 1Bh illegal Memory Descriptor
 1Ch bad return from BDOS load
 1Dh bad return from BDOS read
 1Eh bad return from BDOS open
 1Fh null command
 20h not owner of resource
 21h no CSEG in load file
 22h process Descriptor exists on Thread Root
 23h could not terminate process
 24h cannot attach to process
 25h illegal list device number
 26h illegal password
 28h external termination occurred
 29h fixup error upon load
 2Ah flag set ignored
 2Bh illegal auxilliary device number