Index for interrupt INT 6B

Table of Contents by Order
6B - INT 6B - DECnet DOS - PORT DRIVER
6B - INT 6B - VIRUS - "Saddam" - ORIGINAL INT 21h VECTOR
6B - INT 6B C - HP Vectra AT - IRQ19 - RESERVED HARDWARE INTERRUPT
6B0000 - INT 6B - Novell NASI/NACS, Ungermann-Bass Net One SERIAL I/O - BUFFERED WRITE
6B0100 - INT 6B - Novell NASI/NACS, Ungermann-Bass Net One SERIAL I/O - BUFFERED READ
6B02 - INT 6B - Novell NASI/NACS, Ungermann-Bass Net One SERIAL I/O - INSTALL CHECK
6B0600 - INT 6B - Novell NASI/NACS, Ungermann-Bass Net One SERIAL I/O - CONTROL
6B0700 - INT 6B - Novell NASI/NACS, Ungermann-Bass Net One SERIAL I/O - GET STATUS
6B08 - INT 6B - TelAPI - CHECK FOR BREAK SIGNAL
6B10 - INT 6B - NPC NCSI EXTENDED SERIAL I/O - GET STATUS
6B11--DX0001 - INT 6B - NPC NCSI EXTENDED SERIAL I/O - ALLOCATE A VIRTUAL CIRCUIT
6B12 - INT 6B - NPC NCSI EXTENDED SERIAL I/O - VIRTUAL CIRCUIT STATUS
6B13 - INT 6B - NPC NCSI EXTENDED SERIAL I/O - SET/RETRIEVE REQUEST/REPLY SERVICE NAME
6B14 - INT 6B - NPC NCSI EXTENDED SERIAL I/O - SET/RETRIEVE SERVICE ADDRESS
6B15 - INT 6B - NPC NCSI EXTENDED SERIAL I/O - SET/RETRIEVE VIRTUAL CIRCUIT CONFIG
6B16 - INT 6B - NPC NCSI EXTENDED SERIAL I/O - LOG AND/OR INITIALIZE VIRTUAL CIRCUIT
6B17 - INT 6B - NPC NCSI EXTENDED SERIAL I/O - DISCONNECT A VIRTUAL CIRCUIT
6B18 - INT 6B - NPC NCSI EXTENDED SERIAL I/O - WRITE DATA ON A VIRTUAL CIRCUIT
6B19 - INT 6B - NPC NCSI EXTENDED SERIAL I/O - READ DATA ON A VIRTUAL CIRCUIT
6B1A - INT 6B - NPC NCSI EXTENDED SERIAL I/O - RECEIVE STATUS
6B1B - INT 6B - NPC NCSI EXTENDED SERIAL I/O - TRANSMIT STATUS
6B1C - INT 6B - NPC NCSI EXTENDED SERIAL I/O - CLEAR RECEIVE BUFFER
6B1D - INT 6B - NPC NCSI EXTENDED SERIAL I/O - TRANSMIT BUFFER CONTROL
6B1E - INT 6B - NPC NCSI EXTENDED SERIAL I/O - ISSUE CONTROL REQUEST
6B1F - INT 6B - NPC NCSI EXTENDED SERIAL I/O - EXTERNAL STATUS
6B20 - INT 6B - Connection Manager CLIENT.EXE - ???
6B21 - INT 6B - NPC NCSI EXTENDED SERIAL I/O - QUERY NAME SERVICE
6B6B - INT 6B - Tandy SCHOOLMATE PLUS - API

INT 6B - DECnet DOS - PORT DRIVER
InstallCheck:	test for a signature area (see #03729) immediately preceding
	  the interrupt handler
SeeAlso: INT 6A"DECnet",INT 6C"DECnet"
Index:	installation check;DECnet DOS Port Driver

Format of DECnet DOS signature area:
Offset	Size	Description	(Table 03729)
 -5	BYTE	major version number
 -4	BYTE	minor version number
 -3   3 BYTEs	signature (ASCII "PDV")

INT 6B - VIRUS - "Saddam" - ORIGINAL INT 21h VECTOR
SeeAlso: INT 21/AX=FFFFh,INT 61"VIRUS",INT 70"VIRUS"

INT 6B C - HP Vectra AT - IRQ19 - RESERVED HARDWARE INTERRUPT
SeeAlso: INT 0B"IRQ3",INT 6A"HP Vectra",INT 6C"HP Vectra"

INT 6B - Novell NASI/NACS, Ungermann-Bass Net One SERIAL I/O - BUFFERED WRITE
	AX = 0000h
	CX = length
	ES:BX -> buffer
Return: CX = number of bytes written
Program: NASI is Novell's NetWare Asynchronous Services Interface (purchased
	  from Network Products Corp, who call it NCSI) which runs on
	  workstations; NACS is the NetWare Asynchronous Communications
	  Services module which runs on servers
InstallCheck:	test for the signature string "NCSI" three bytes past the
	  interrupt handler; see also AH=02h.
	As of version 3.0, Novell's NASI can be distinguished from NPC's
	  NCSI by the presence of an 'A' immediately following the signature
Notes:	this function is also supported by TelAPI, NPC NCSI, and Connection
	  Manager CLIENT.EXE; for TelAPI, nonzero values in AL specify a
	  connection ID
	Connection Manager returns CF set/AL=FFh if called while an INT 6B
	  call is already in progress
SeeAlso: AX=0100h,AH=18h,INT 14/AH=19h,INT 14/AH=E3h

INT 6B - Novell NASI/NACS, Ungermann-Bass Net One SERIAL I/O - BUFFERED READ
	AX = 0100h
	CX = length of buffer
	ES:BX -> buffer
Return: CX = number of bytes read
Note:	also supported by TelAPI and NPC NCSI; for TelAPI, nonzero values in
	  AL specify a connection ID
SeeAlso: AX=0000h,AH=19h,INT 14/AH=18h,INT 14/AH=E2h,INT 14/AX=FF02h

INT 6B - Novell NASI/NACS, Ungermann-Bass Net One SERIAL I/O - INSTALL CHECK
	AH = 02h
	AL nonzero
Return: AL = 00h if present and OK
Note:	this function is also supported by TelAPI and NPC NCSI
SeeAlso: AX=0700h

INT 6B - Novell NASI/NACS, Ungermann-Bass Net One SERIAL I/O - CONTROL
	AX = 0600h
	CX = command
	    02h send break
	    04h disconnect
	    06h hold
Return: CF clear if successful
	    AL = 00h
	CF set on error
	    AX < 0
Note:	this function is also supported by TelAPI and NPC NCSI

INT 6B - Novell NASI/NACS, Ungermann-Bass Net One SERIAL I/O - GET STATUS
	AX = 0700h
Return: CH <> 00h if connection active
Notes:	this function is also supported by TelAPI and NPC NCSI
	Novell TelAPI returns CX=FF01h and CF clear
SeeAlso: AH=02h,AH=10h

INT 6B - TelAPI - CHECK FOR BREAK SIGNAL
	AH = 08h
	AL = circuit number
Return: CF clear if no breaks
	    AL = 00h
	    CX = 0000h
	CF set if one or more breaks received
Note:	this function also clears ??? flag
SeeAlso: INT 14/AX=FF00h

INT 6B - NPC NCSI EXTENDED SERIAL I/O - GET STATUS
	AH = 10h
	AL = connection ID (Novell TELAPI.EXE)
	CX = ???
	ES:BX -> buffer for status (see #03730)
Return: CF clear if successful
	    CL = ???
	    CH = ???
	CF set on error
	???
Notes:	this function is also supported by TelAPI
	when shelled out to an external protocol from Novell NASI, the circuit
	  whose status indicates that it is connected is the currently active
	  circuit
SeeAlso: AX=0700h,AH=12h,AH=1Fh

Format of NASI status:
Offset	Size	Description	(Table 03730)
 00h	BYTE	number of allocated virtual circuits
 01h	BYTE	reserved
 02h  9 BYTEs	states of emulated circuits 0-8
		00h idle
		01h attached Telnet session, in command state
		02h attached Telnet session, connected with host
		03h-06h ??? (not returned by TelAPI)
Note:	this description is derived from the Novell TelAPI emulation of NASI

INT 6B - NPC NCSI EXTENDED SERIAL I/O - ALLOCATE A VIRTUAL CIRCUIT
	AH = 11h
	DX = 0001h
	AL = 00h
	ES:BX -> service name string (8 characters, blank-padded)
Return: CF clear if successful
	    AL = virtual circuit number allocated (01h for Novell TELAPI.EXE)
	    CL = ??? (01h for Novell TELAPI.EXE)
	    CH = ??? (01h for Novell TELAPI.EXE)
	CF set on error
	    ???
Note:	this function is also supported by TelAPI
SeeAlso: AH=12h,AH=15h,AH=16h,AH=17h,AH=18h

INT 6B - NPC NCSI EXTENDED SERIAL I/O - VIRTUAL CIRCUIT STATUS
	AH = 12h
	AL = virtual circuit number (0-8)
Return: CF clear if successful
	    AL = virtual circuit number
	    CL = virtual circuit's state
		00h idle
		01h Telnet session, in command state
		02h Telnet session, connected to host
		03h-06h ??? (not returned by TelAPI)
	CF set on error
	    AL = error code
		E2h invalid virtual circuit number
		E4h specified virtual circuit not allocated
Note:	this function is also supported by TelAPI
SeeAlso: AH=10h,AH=15h,AH=1Ah,AH=1Bh,AH=1Fh

INT 6B - NPC NCSI EXTENDED SERIAL I/O - SET/RETRIEVE REQUEST/REPLY SERVICE NAME
	AH = 13h
	AL = virtual circuit number
	CL = direction (00h get, nonzero set)
	ES:BX -> buffer for/containing service name
Return: ???
Note:	this function is also supported by TelAPI
SeeAlso: AH=14h,AH=15h

INT 6B - NPC NCSI EXTENDED SERIAL I/O - SET/RETRIEVE SERVICE ADDRESS
	AH = 14h
	AL = virtual circuit number
	ES:BX -> buffer for/containing service address
Return: ???
Note:	this function is also supported by TelAPI, which only supports
	  retrieving the address
SeeAlso: AH=13h,AH=15h,AH=21h

INT 6B - NPC NCSI EXTENDED SERIAL I/O - SET/RETRIEVE VIRTUAL CIRCUIT CONFIG
	AH = 15h
	AL = virtual circuit number
	CL = direction (00h get, nonzero set)
	ES:BX -> buffer for/containing virtual circuit config (see #03731)
Return: ES:BX buffer filled
Note:	this function is also supported by TelAPI
SeeAlso: AH=13h"NCSI",AH=14h"NCSI"

Format of virtual circuit configuration:
Offset	Size	Description	(Table 03731)
 00h	WORD	buffer length
 02h	WORD	port ID
 04h	WORD	receive rate
 06h	WORD	receive word length
 08h	WORD	receive stop bits
 0Ah	WORD	receive parity
 0Ch	WORD	transmit rate
 0Eh	WORD	transmit word length
 10h	WORD	transmit stop bits
 12h	WORD	transmit parity
 14h	WORD	DTR
 16h	WORD	RTS

INT 6B - NPC NCSI EXTENDED SERIAL I/O - LOG AND/OR INITIALIZE VIRTUAL CIRCUIT
	AH = 16h
	AL = virtual circuit number
	CL = ??? switch (00h, ???)
Return: CF clear if successful
	    AL = virtual circuit number
	CF set on error
	    ???
Note:	this function is also supported by TelAPI, which always returns CF
	  clear and AL=00h
SeeAlso: AH=11h,AH=12h,AH=17h

INT 6B - NPC NCSI EXTENDED SERIAL I/O - DISCONNECT A VIRTUAL CIRCUIT
	AH = 17h
	AL = virtual circuit number
Return: CF clear if successful
	CF set on error
	???
Note:	this function is also supported by TelAPI, which always returns CF
	  clear and AL=00h
SeeAlso: AH=11h,AH=16h

INT 6B - NPC NCSI EXTENDED SERIAL I/O - WRITE DATA ON A VIRTUAL CIRCUIT
	AH = 18h
	AL = virtual circuit number
	CX = number of characters to send
	ES:BX -> buffer containing characters to be sent
Return: CF clear if successful
	CF set on error
	???
Note:	this function is also supported by TelAPI, which always returns CF
	  clear and AL=30h
SeeAlso: AX=0000h,AH=12h,AH=19h

INT 6B - NPC NCSI EXTENDED SERIAL I/O - READ DATA ON A VIRTUAL CIRCUIT
	AH = 19h
	AL = virtual circuit number
	CX = number of characters to read
	ES:BX -> buffer for received characters
Return: CX = 0000h if failed
	CX = nonzero (possibly number of characters received) if successful
Note:	this function is also supported by TelAPI
SeeAlso: AX=0100h,AH=12h,AH=18h

INT 6B - NPC NCSI EXTENDED SERIAL I/O - RECEIVE STATUS
	AH = 1Ah
	???
Return: ???
SeeAlso: AH=12h,AH=1Bh

INT 6B - NPC NCSI EXTENDED SERIAL I/O - TRANSMIT STATUS
	AH = 1Bh
	???
Return: ???
SeeAlso: AH=12h,AH=1Ah

INT 6B - NPC NCSI EXTENDED SERIAL I/O - CLEAR RECEIVE BUFFER
	AH = 1Ch
	AL = circuit number
Return: nothing
SeeAlso: AH=1Dh"NCSI",AH=1Eh"NCSI"

INT 6B - NPC NCSI EXTENDED SERIAL I/O - TRANSMIT BUFFER CONTROL
	AH = 1Dh
	???
Return: ???
SeeAlso: AH=1Ch,AH=1Eh

INT 6B - NPC NCSI EXTENDED SERIAL I/O - ISSUE CONTROL REQUEST
	AH = 1Eh
	???
Return: ???
SeeAlso: AH=1Ch,AH=1Dh

INT 6B - NPC NCSI EXTENDED SERIAL I/O - EXTERNAL STATUS
	AH = 1Fh
	???
Return: ???
SeeAlso: AH=10h,AH=12h

INT 6B - Connection Manager CLIENT.EXE - ???
	AH = 20h
	???
Return: ???
Program: Connection Manager by Softwarehouse Corp. permits the sharing of
	  serial ports over an IPX or NetBIOS-based network
Note:	CLIENT.EXE returns CF set/AL=F9h if AH is not 00h to 21h on entry

INT 6B - NPC NCSI EXTENDED SERIAL I/O - QUERY NAME SERVICE
	AH = 21h
	AL = virtual circuit number
	CL = ??? (00h or 01h)
	ES:BX -> buffer for service name structure (see #03732)
Return: CF clear if successful
	    ES:BX buffer filled
	CF set on error
Notes:	a program should call this function after allocating a virtual circuit
	  and check that the general name matches the requested service
	prior to version 3.0, Novell's NASI returned the first available port;
	  v3.0+ returns the first port found--check the returned status to
	  determine whether the port is available
SeeAlso: AH=14h"NCSI"

Format of NCSI service name structure:
Offset	Size	Description	(Table 03732)
 00h	WORD	buffer length
 02h  8 BYTEs	service name
 0Ah  8 BYTEs	general name
 12h  8 BYTEs	specific name
 1Ah  4 BYTEs	???
---Novell NASI v3.0+ ---
 1Eh	BYTE	port number
 1Fh	BYTE	port status
		00h idle (available)
		01h allocated (available)
		02h connected
		03h on hold

INT 6B - Tandy SCHOOLMATE PLUS - API
	AH = 6Bh
	AL = E0h to FFh
Note:	details not yet available