Overlay Command Set; An Example Of Overlay Nesting - IBM 6400 Programmer's Reference Manual

Overlay Command Set

Overlay Command Set
The overlay command set contains the commands the printer uses to store,
delete, and present information in the overlay memory of the printer. These
commands are independent of any specific data types used in defining the
overlay.
The overlay is contained between the Begin Overlay (BO) command and the End
Page (EP) command and cannot contain itself. Overlays can be nested; that is,
overlays can contain other overlays. The depth of the overlay nesting cannot
exceed five levels.
Figure 25 shows an overlay nesting.
Figure 25. An Example of Overlay Nesting
The following commands are the overlay command set: The following pages
describe the overlay command set commands.
Notes:
1. 64XX does not support Secure Overlay (value X
2. See "Notation Conventions" on page 27 regarding the notation convention
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6400 IPDS
Table 104. Overlay Command Set
Name Command
Begin Overlay X D6DF
'
Deactivate X D6EF
'
Overlay
Include Overlay X D67D
'
Overlay is not supported).
for Include Overlay bytes 3-5 and 7-9.
Sub- Description
command
'
'
'
' 01 ' in byte 2 of Include