Program Logic Manual - All about the IBM 1130 Computing System

SYNCHRONOUS COMMUNICATIONS ADAPTERSUBROUTINE (SCAT1)Alarm. If the operation is the turning on/off of theaudible alarm, SCAT1Call Processing1. turns the audible alarm on in the local systemif digit 4 of the control parameter is zeroThe call processing routine2. turns the audible alarm off in the local systemif digit 4 of the control parameter is non-zero• Checks the call parameters for errors 3. returns to the calling routine at LIBF+2.a Sets up the processing of subsequent interrupts Close. If the operation is a Close, SCAT1depending on the operation requested by the call1. resets the SCA• Initiates the requested operation 2. clears the programmed indicators in SCAT13. decrements the $SCAT counter by 1 (word 17Operationin COMMA)4. returns to the calling routine at LIBF+2When entered via a LIBF, SCAT1Open. If the operation is an Open, SCAT11. saves XR1, XR2, accumulator and extension, andstatus1. determines the requested mode of operation2. examines the control parameter to determine the from digit 4 of the control parameter (digit 4operation requestedzero indicates Data In, non-zero indicates Data3. obtains and saves the I/O area address and error Out)routine address parameters if the operation is 2. puts the addresses of the read response, writean Open, Transmit, or Acknowledge and Receive response, and timeout routines for the Openand Error Statisticsoperation into the interrupt branch addresses4. determines, if the operation is a Transmit or 3. begins transmission of the IDLE character forAcknowledge and Receive, from digit 3 of the1. 5 secondscontrol parameter if ILRCs will be present in 4. increments the $SCAT counter by 1transmitted or received data records (digit 3 5. sets the retry counter to 7non-zero indicates ILRCs will be present, zero 6. sets RTBSY on (non-zero)indicates ILRCs will not be present)7. returns to the calling routine at LIBF+4Test. If the operation is a Test, SCAT11. checks the routine busy indicator (RTBSY)2. returns to the calling routine at LIBF+3 ifRTBSY is off (zero)3. returns to the calling routine at LIBF+2 ifRTBSY is on (non-zero)Auto Answer. If the operation is the enabling/disabling of the auto answer interrupt, SCAT11. (if digit 4 of the control parameter is zero)enables the auto answer interrupt, saves theI/O area address, and returns to the callingroutine at LIBF+32. (if digit 4 of the control parameter is non-zero)disables the auto answer interrupt and returnsto the calling routine at LIBF+2Transmit. If the operation is a Transmit, SCAT11. puts the addresses for the read response,write response, and timeout routines for theTransmit operation into the interrupt branchaddresses2. determines the type of transmission from digit 2of the control parameter (digit 2 equal to 0indicates transmission of a data record, 1 indicatestransmission of the End of Transmissionsequence, and 2 indicates transmission of theTelephone sequence)3. performs a Start Write (puts the SCA in the transmitmode and causes a write response interrupt)4. sets the retry counter to 75. sets RTBSY on (non-zero)6. returns to the calling routine at LIBF+4108