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Host Addressable Printing On Control Unit Terminal Displays

IP.com Disclosure Number: IPCOM000102651D
Original Publication Date: 1990-Dec-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 3 page(s) / 79K

Publishing Venue

IBM

Related People

Hayashi, N: AUTHOR [+2]

Abstract

Host Addressable Printing (HAP) on Control Unit Terminal (CUT) displays is disclosed which can process the print data from the Host to the display-attached printer. To facilitate this function, a new logical path between the control unit and the CUT display terminal has been defined and implemented. Fig. 1 shows a logical path in the system.

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Host Addressable Printing On Control Unit Terminal Displays

       Host Addressable Printing (HAP) on Control Unit Terminal
(CUT) displays is disclosed which can process the print data from the
Host to the display-attached printer. To facilitate this function, a
new logical path between the control unit and the CUT display
terminal has been defined and implemented.  Fig. 1 shows a logical
path in the system.

      The logical path between the control unit and the CUT display
for the HAP function comprises:
      1. HAP feature (feature address C, D)
      2. Bit 4 of the Poll command
      3. Poll response and status register for the HAP
         feature
      Fig. 2 shows base and HAP features.

      Using these HAP feature commands (Fig. 3) the control unit with
the new control program can write/read the HAP buffer and can
set/update the HAP registers.
      Fig. 4 shows a poll command bit 2-4.

      The bit 4 of the Poll command which was originally a reserved
bit is now used for the CUT HAP support. The Poll command is a
special command because it is independent from any features; any
feature can respond its status as an answer to the Poll. The Poll
command is one of the read commands but bit 2 and 3 of Poll command
is used for the special control for specific feature as if it were a
write-type command.  Bit 4 is now used to determine whether the
control goes to the Base feature or the HAP feature (Fig. 4).
    ...