Browse Prior Art Database

Extended Memory Read to Isolate Display Types

IP.com Disclosure Number: IPCOM000119825D
Original Publication Date: 1991-Mar-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 2 page(s) / 54K

Publishing Venue

IBM

Related People

Kavita, V: AUTHOR [+3]

Abstract

A method to isolate different types of displays belonging to the same group is disclosed. During bring-up, the workstation controller (WSC) reads extended memory at a particular address for all displays of the same group; the differences in data at that address are used to isolate the display types.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 76% of the total text.

Extended Memory Read to Isolate Display Types

      A method to isolate different types of displays belonging
to the same group is disclosed.  During bring-up, the workstation
controller (WSC) reads extended memory at a particular address for
all displays of the same group; the differences in data at that
address are used to isolate the display types.

      A method to isolate different types of displays belonging to
the same group is disclosed.  During bring-up, the WSC reads extended
memory at a particular address for all displays of the same group.
The differences in data at that address are used to isolate the
display types between IBM dependent displays, non-IBM dependent
displays, and PCs emulating dependent displays (see the figure).

      Displays attached to the WSC can be IBM non-programmable
terminals (NPTs), non-IBM NPTs or programmable workstations (PWSs)
emulating NPTs.  The bring-up sequence for a particular group of NPTs
is the same.  The WSC will now provide a way to determine which of
the three types the attached display is.

      During bring-up, the WSC will issue a read to a particular
address in the extended memory of the attached display.  IBM NPTs
belonging to a particular display group have a unique sequence of
bytes at a specif- ic address (for example, a portion of the display
part number).  Another unique sequence of bytes can be specified at
the same address for non-IBM NPTs by publishing the suggested
sequence in a disp...