;CHAOS NET INTERFACE DEFS			-*- PALX -*-

;USUAL ADDRESS IS 764140 .  USUAL INTERRUPT VECTOR IS 270 .

CAICSR=164140		;COMMAND STATUS REG
CH.CSR==0		;OFFSET OF CSR FROM THE BASE ADDRESS
 %CATIE==1		;0 FORMERLY XMT BUSY NOW QUAD TIMER INTERRUPT ENABLE (R/W)
 %CALPBK==2		;1 LOOP BACK MODE (DOESN'T USE CABLE WHEN ON) (R/W)
 %CASPY==4		;2 RECIEVE MSGS FOR ANY DESTINATION (R/W)
 %CARCL==10		;3 CLEAR THE RECEIVER. WRITING A 1 CLEARS RCV DONE
			; AND ENABLES THE RECEIVER TO GOBBLE ANOTHER MESSAGE (WO)
 %CAREN==20		;4 RCV INT ENB (R/W)
 %CATEN==40		;5 XMT INT ENB (R/W)
 %CATAB==100		;6 TRANSMIT ABORTED BY ETHER CONFLICT (RO)
 %CATDN==200		;7 TRANSMIT DONE. SET WHEN TRANSMITTER IS DONE
 %CATCL==400		;8 CLEAR THE TRANSMITTER MAKING IT READY (WO)
			;9-12    LOST COUNT (RO) [# MSGS RCVED WITH RCV BFR FULL]
			;        WHEN MSG IS WAITING IN BUFFER, THIS COUNTS
			;        THE MESSAGES THAT MATCHED OUR DESTINATION OR
			;        WERE BROADCAST, BUT COULDN'T BE RECIEVED.
			;	 WHEN RECEIVER IS RE-ENABLED (WRITE 1 INTO %CARDN)
			;	 THE COUNT IS THEN CLEARED.
			;	 WHEN A MESSAGE IS LOST, RECEIVER ZAPS ETHER
			;	 SO TRANSMITTER WILL ABORT (IF MESSAGE WAS DESTINED
			;        TO US.)
 %CARST==20000		;13 I/O RESET (WO)
 %CAERR==40000		;14 CRC ERROR (RO)
 %CARDN==100000		;15  RCV DONE.  

CAIMYN=164142		;MY # (READ ONLY)
			;RETURNS THE [SOURCE] HOST# OF THIS INTERFACE.		
CH.MYN==2		;OFFSET
CH.NET==3		;OFFSET FOR READING SUBNET #


CAIWBF=164142		;WRITE BUFFER (WRITE ONLY)
CH.WBF==2		;OFFSET
			;FIRST WAIT FOR TDONE. (OR SET IT VIA CSR)
			;FIRST WORD IN RESETS TRANSMITTER AND CLEARS TDONE.
			;STORE INTO THIS REGISTER TO WRITE WORDS OF MESSAGE,
			;LAST WORD IN IS DESTINATION ADDRESS, THEN READ CAIXMT.
			;SOURCE ADDRESS AND CHECK WORD PUT IN BY HARDWARE.

CAIRBF=164144		;READ BUFFER (READ ONLY)
CH.RBF==4		;OFFSET
			;THE FIRST WORD READ WILL BE FILLED TO THE LEFT
			;TO MAKE THE MESSAGE RECIEVED A MULTIPLE OF 16 BITS.
			;IF THE NUMBER OF DATA BITS IN THE MESSAGE WAS A
			;MULTIPLE OF 16, THIS WORD WILL BE THE FIRST WORD PUT
			;INTO THE BUFFER BY THE TRANSMITTING HOST.
			;THE LAST 3 WORDS READ ARE DESTINATION, SOURCE, CHECK.

CAIRBC=164146		;RECEIVE BIT COUNTER  (READ ONLY)
CH.RBC==6		;OFFSET
			;WHEN A MESSAGE HAS BEEN RECEIVED THIS IS ONE LESS THAN
			;THE NUMBER OF BITS IN THE MESSAGE (16 X THE
			;NUMBER OF WORDS INCLUDING THE THREE OVERHEAD WORDS.)
			;AFTER THE LAST WORD (THE CRC WORD) HAS BEEN READ, IT IS 7777
			;BITS 10 AND 11 ARE THE HIGH ORDER BITS, AND IF THEY ARE ONE,
			;THEN THERE WAS A BUFFER OVERFLOW

			;NOTE:  FOR THE Q-BUS VERSION OF THE INTERFACE (FOR LSI-11'S)
			;WRITING CAIMYN INTO CAIRBC INITIATES TRANSMISSION.

CAIXMT=164152		;READING THIS INITIATES TRANSMISSION (!!)
CH.XMT==12		;OFFSET
			;THE VALUE READ IS ONE'S OWN HOST#.
			;**** NOTE COMMENT ABOVE UNDER CAIRBF FOR LSI-11'S ****

;REFERENCING ADDRESSES IN THE GROUP OF 8 WORDS NOT LISTED HERE, OR
;USING COMBINATIONS OF READ/WRITE NOT LISTED HERE, WILL TYPICALLY CAUSE
;STRANGE AND BIZARRE EFFECTS.

CAIBRV==270		;STANDARD INTERRUPT VECTOR


;;; OPCODES AND CONNECTION STATES FROM SYSTEM;CHSDEF > (BE SURE TO UPDATE BOTH
;;; PLACES IF YOU MAKE A CHANGE).

;PACKET OPCODES

 %CORFC==1		;REQUEST FOR CONNECTION
 %COOPN==2		;OPEN
 %COCLS==3		;CLOSE
 %COFWD==4		;FORWARD
 %COANS==5		;ANSWER
 %COSNS==6		;SENSE STATUS
 %COSTS==7		;REPORT STATUS
 %CORUT==10		;ROUTING INFO (NOT YET USED)
 %COLOS==11		;REPORT LOSSAGE
 %COLSN==12		;LISTEN FOR RFC
 %COMNT==13		;MAINTENANCE USE, IGNORED BY NORMAL NCPS
 %COEOF==14
 %COUNC==15
 %COMAX==16		;HIGHEST NON-DATA OPCODE +1
 %CODAT==200		;NORMAL DATA OPCODE (NOTE SIGN BIT OF WORD IS SET)
 %CODWD==300		;16-BIT DATA


;PACKET SIZE (THESE NUMBERS ARE FOR 4K PACKET BUFFERS)

%CPMXW==126.	;MAXIMUM NUMBER OF PDP10 WORDS IN WHOLE PACKET
%CPMXC==488.	;MAXIMUM NUMBER OF CHARACTERS OF DATA

;CONNECTION STATES

%CSCLS==0	;CLOSED
%CSLSN==1	;LISTENING
%CSRFC==2	;RFC RECEIVED
%CSRFS==3	;RFC SENT
%CSOPN==4	;OPEN
%CSLOS==5	;BROKEN BY RECEIPT OF "LOS"
%CSINC==6	;BROKEN BY INCOMPLETE TRANSMISSION (NO RESPONSE TO SNS)