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Host Performance Highlights
Existing 3270 graphics users will generally benefit from improved system
performance when using the work stations with GDDM Release 4. GDDM
Release 4, together with the Graphics Control Program, uses the
programmability and segment storage of the work stations to offload some
commonly-used graphics functions from the host processor to the work
station. The following advantages result:
•
Host path-length is reduced.
•
The data stream for many graphics pictures is reduced.
•
Where the application has been suitably designed, the number of
interactions with the host computer is reduced when moving segments
of a picture around at the work station. Furthermore, only the
changed segments of a picture need be retransmitted from the host
computer.
Appendix D contains a more detailed statement of these performance
improvements.
Local Environment
Existing IBM Personal Computer Application Programs
Existing IBM Personal Computer application programs are supported on
the work stations by:
•
Emulation of the IBM PC Color Graphics Adapter
•
Emulation of the PC keyboard interrupts
•
Software emulation of the IBM PC Basic Input Output Services (BIOS)
interface.
Details of the limitations of the IBM PC Color Graphics Adapter emulation
and of restrictions on programs that do not use the BIOS interface are
given in Appendix B. Users must test particular PC application programs
in which they are interested to ensure that they run on the work stations.
Chapter 5. The Software Environment
55
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