Compuprint 4247-Z03 Programmer Manual - Manual (Page 105)

Overlay (BO)” on page 194. Figure 7 shows various data types on a page.
Notes:
1. Overlays and page segments can be merged on this page.
2. Text and data blocks can be positioned at different places on this page.
3. A logical page can be positioned anywhere with respect to the physical medium.
Mixing Rules
IPDS allows the same physical pel to be overwritten an unlimited number of times. Overwriting can occur
both within a block and across blocks. For example, within text blocks, overwriting can be caused by using
the Overstrike control. Within a graphics block, overwriting occurs whenever one graphics area or figure
overlays another. Across block overwriting can occur whenever one IPDS block physically overlays any
portion of another IPDS block.
Within each block, the 4247 Printer further defines background pels and foreground pels. Foreground pels
are:
v The one pels of a character
Figure 7. A Sample Page Constructed on an IPDS Printer
Chapter 3. Intelligent Printer Data Stream 85