Type ASSEMBLE
Source Lines : 2,416
Fixes Applied : 25
Most Recent Version : Thursday, December 7, 1978
Last Fix ID : [HRC370DK]
Module
DMKCNS - SLOW-SPEED TERMINAL INTERRUPT HANDLER
Function
SECOND LEVEL INTERRUPT HANDLER FOR 3210, 3215, 1052, 2150,
7412 SYSTEM CONSOLES, AND 2741, 1050, TTY TERMINALS.
PERFORMS I/O INTERRUPT HANDLING INCLUDING ERROR RECOVERY
FOR THESE DEVICES.
Attributes
RE-ENTRANT, RESIDENT, ENTERED VIA INTERRUPT OR CPEXBLOK
Operation
IN AP-MODE
DMKCNSIC IS ENTERED VIA CPEXBLOK WHENEVER DMKQCN HAS ADDED
A CONTASK TO AN EMPTY CONTASK STACK, OR WHEN A PRIORITY
TASK HAS BEEN STACKED. THE CCW STRING IS BUILT IN THE
CONTASK CREATED BY DMKQCN, AS FOLLOWS:
1. WRITE CONTASK'S:
3210, 3215, 1052, ETC.:
WRITE CCW FOR THE EBCDIC DATA, WITH OR WITHOUT CARRIAGE
RETURN AS SPECIFIED BY 'NOAUTO', FOLLOWED BY EITHER A NO-OP
OR AN ALARM CCW, AS SPECIFIED BY 'ALARM'.
2741, 1050:
WRITE CCW FOR THE DATA, FOLLOWED BY READ ACKNOWLEDGMENT
FOR 1050 ONLY. A CARRIAGE RETURN CHARACTER (X'5B') IS ADDED
TO THE END OF THE DATA UNLESS 'NOAUTO' IS SPECIFIED,
AND THE NECESSARY IDLE CHARACTERS (1 IDLE PER 10 DATA CHARS)
ARE INSERTED AFTER THE CARRIAGE RETURN. AN EOB IS ALSO SET
FOR A 1050.
CPT-TWX:
WRITE CCW FOR THE DATA, FOLLOWED BY A WRITE FOR THE BELL
IF 'ALARM' WAS SPECIFIED. THE SEQUENCE 'CR,LF,XOFF,RUBOUT'
IS ADDED AT THE END OF THE DATA UNLESS 'NOAUTO' IS SET.
2. READ CONTASK'S:
3210, 3215, 1052, ETC.:
READ CCW FOR THE SPECIFIED LENGTH, FOLLOWED BY A NO-OP.
2741, 1050:
WRITE OF ADDRESSING CHARACTERS (CIRCLE-C FOR 2741, CIRCLE-C,
COMMON POLL FOR 1050), FOLLOWED BY PREPARE, FOLLOWED BY READ
OF SPECIFIED LENGTH, DATA-CHAINED TO A DUMMY READ-SKIP FOR
4096 BYTES (TO IGNORE EXECSS DATA).
CPT-TWX:
WRITE FOR '., XON' PROMPTING SEQUENCE, FOLLOWED BY READ
OF SPECIFIED LENGTH, DATA-CHAINED TO DUMMY READ-SKIP (4K).
IF THE 'INHIBIT' PARMATER IS SET IN THE READ CONTASK, EITHER
THE 2741, 1050 PRINT SUPPRESS FEATURE IS ENABLED TO PREVENT
DATA TYPEOUT, OR A MASKING STRING IS WRITTEN TO OBSCURE THE
INPUT DATA. A NULL LINE OR ATTENTION FOR AN INHIBIT READ
WILL FORCE THE MASKING STRING TO BE TYPED, AND FOR THE PRINT
SUPPRESS FEATURE TO BE DISABLED.
Calls to Other Routines
DMKBLDVM - TO BUILD A VMBLOK FOR A NEW USER
DMKCFMBK - TO PLACE A USER IN CP CONSOLE FUNCTION MODE
DMKCFMAT - TO SIMULATE A VIRTUAL CONSOLE ATTENTION
DMKQCNCL - TO CLEAR THE CONTASK STACK
DMKQCNET - TO PROCESS SPOOLING, ETC. OF FINISHED CONTASK'S
DMKQCNTO - TO DISCONNECT A USER IN CASE OF LINE FAILURE
DMKCVTBH - TO CONVERT A BINARY DEVICE ADDRESS TO EBCDIC
DMKSCNRU - TO LOCATE A REAL DEVICE BLOCK (RDEVBLOK)
DMKIOSQR - TO INITIATE A START I/O
DMKTRMID - TO IDENTIFY THE TRANSLATE TABLE TO BE USED
DMKIOERR - TO RECORD PERMENANT I/O ERRORS
DMKMSWR - TO SEND I/O ERROR MESSAGE TO THE OPERATOR
DMKSCNRD - TO GET THE REAL ADDRESS FROM AN RDEVBLOK
DMKCPIEM - RE-ENTRY TO DMKCPI FOR ALTERNATE CONSOLE
DMKERMSG - TO SEND ERROR MESSAGES TO THE OPERATOR
DMKIOEST - TO CAUSE THE UPDATE OF STATISTICAL DATA COUNTERS
DMKLOKSW - SWITCH TO ANOTHER VMBLOK IF SYSTEM IS AP-MODE
DMKPTRAN - TO BRING IN THE TRANSLATE TABLE