Display Data StreamChapter —6
274 TE 2000
5250 Terminal Emulation Programmer’s Guide
Roll
Function
The Roll command causes the image presented in the terminal display to
roll up or down across the larger image area available on the IBM Display
Station.
Restrictions
The command is rejected if the display is in the prehelp error, posthelp
error, system request, or SS message state.
Note: If the display supports a separate message line, and the message line
is selected, the command is rejected only for system request and SS mes-
sage states. The command is processed with the display in error state.
Format
The command consists of five bytes in the following form:
Row Number
ESC Command Direction Top Bottom
Hex 04 Hex 23 Hex 08 Hex 01 Hex 23
Bits in the direction byte define the direction and number of lines to roll.
See the following chart for the bit meanings. Bit 7 is the most signif icant
bit.
Bit Description
7 0=Roll up
1 = Roll down
6–0 Number of lines to roll
The top row number tells the first line for inclusion in the roll. Bottom
row number tells the last row number to include. Top and bottom row
numbers together define the number of lines presented on the display for
the roll.
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