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*              IPB   HELP FILE  4 MAY 1978                *
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       THIS FILE CONTAINS THE INSTRUCTIONS FOR THE USE OF THE
INTERPROCESSOR BUFFER.  THE BUFFER WAS ADDED TO THE SYSTEM AS
A PROJECT FOR EECS415.  THE INSTRUCTOR FOR THE COURSE WAS
DALE SPARKS AND YOU SHOULD BE INDEBTED TO HIM FOR THE HARDWARE
AND THE INFORMATION REGARDING THE SOFTWARE THAT MADE THIS
PROJECT POSSIBLE

       THE DEVICE HANDLER WAS MODIFIED FROM A TELETYPE HANDLER
AND THEREFORE HAS SOME OF THE SAME CHARACTERISTICS.  THE IPB
DOES NOT, HOWEVER, PACK THE DATA.  IT TRANSFERS FULL 12 BIT
WORDS.  THIS IS AN IMPORTANT POINT THAT SHOULD NOT BE FORGOTTON.

       THE IPB IS SEEN BY THE OS/8 OPERATING SYSTEM AS JUST
ANOTHER DEVICE.  IT CAN BE READ FROM OR WRITTEN TO IN THE
SAME WAY ANYOTHER DEVICE CAN.  THE ONLY EXCEPTION TO THIS SEEMS
TO BE THAT THE IPB IS NOT USABLE BY ABSLDR.  THAT IS, "IPB:"
CANNOT BE SPECIFIED AS INPUT TO ABSLDR AT THE PRESENT TIME
(THE RESONS BEHIND THIS ARE BEING INVESTIGATED AND IT IS HOPED
THAT THIS WILL BE CORRECTED IN THE NEAR FUTURE).


***USE OF THE IPB***

       THE INTERPROCESSOR BUFFER CONNECTS TWO PDP8/E'S TOGETHER.
AS WAS MENTIONED BEFORE IT TRANSFERRES 12 BIT WORDS. IT IS
THEREFORE RECCOMENDED THAT UNLESS THE TTY: IS BEING USED TO
RECEIVE THE DATA FROM THE IPB THAT IMAGE MODE BE USED FOR ALL
TRANSFERS. THIS ASSURES THAT THE DATA WILL ALL BE TRANSFERRED.

--EXAMPLES:--
1)     TO TRANSFER THE FILE IPB.HL FROM THIS MACHINE TO THE
OTHER ONE WITH THE IPB TYPE:

       .R PIP               OS/8 PRINTS THE .
       *IPB:<IPB.HL/I       PIP  PRINTS THE *

THIS WILL ALLOW THE DATA TO BE SENT.
ON THE RECEIVING MACHINE TYPE:

       .R PIP               OS/8 PRINTS THE .
       *IPB.HL<IPB:/I       PIP  PRINTS THE *

THIS WILL MAKE THE IPB.HL FILE ON THE SECOND MACNINE.
(ON DTA0:)

2)     TO USE THE SECOND MACHINE AS A LINE PRINTER DO NOT
USE THE /I AND TYPE TTY:<IPB: IN RESPONSE TO THE * FROM PIP
ON THE SECOND MACHINE.

--ADDING IPB: TO AN UNDERPRIVILIGED OS/8 SYSTEM--

       IT IS ASSUMED THAT SINCE YOU HAVE THIS FILE YOU ALSO
HAVE ACCESS TO THE FILE IPB002.BN.  IF NOT, CONTACT DALE SPARKS
OR JOHN BRAYER IN THE EECS DEPARTMENT OF THE UNIVERSITY OF NEW
MEXICO.

       TO ATTACH THE IPB DRIVER TO THE OS/8 OPERATING SYSTEM
FOLLOW THE INSTRUCTIONS IN THE OS/8 HANDBOOK UNDER BUILD FOR
ADDING DEVICE DRIVERS TO THE SYSTEM.  THIS IS A VERY ACCURATE
DESCRIPTION AND FOR THAT REASON IS NOT REPEATED HERE. YOU WILL
NEED THE FOLLOWING INFORMATION:

  1)   THE BINARY FILE IS IPB002.BN
  2)   YOU WILL PROBABLY HAVE TO UNLOAD LNC IN ORDER
       FOR THERE TO BE ENOUGH ROOM. (IF YOU GET A
       "NO ROOM" MESSAGE.
  3)   THE GNAME AND PNAME ARE BUFF AND IPB RESPECTIVELY
  4)   BE SURE TO ISSUE THE BO COMMAND WHEN THE DRIVER
       HAS BEEN INSERTED
  5)   **********NOTICE**********NOTICE**********NOTICE*******
            THE BUILD PROGRAM ON THE TC08 SYSTEM IS TCRBLD.
            USING BUILD WILL SCREW UP THE SYSTEM!!!!!!!!!!!
       **********NOTICE**********NOTICE**********NOTICE*******

CHANGES WILL BE ADDED TO THE FRONT OF THIS FILE (AFTER THE
HEADER) AND WILL BE DATED SO THAT YOU DO NOT HAVE TO WADE
THROUGH ALL OF THE STUFF YOU ALREADY KNOW JUST TO SEE IF THERE
HAVE BEEN ANY CHANGES MADE RECENTLY.

       IF YOU HAVE ANY QUESTIONS OR COMMENTS REGARDING THE
IPB DRIVER PLEASE DIRECT THEM TO JOHN MCDERMOTT, JR. OR
DALE SPARKS.