IBM 32x Carriage return 0D CR, Test 0F SI, Display position 10 DLE, Input/output device commands

Input/output device commands 11-9-2005

line is cleared, and the cursor position is unchanged. This command always stops the scrolling alphanumeric message.

Carriage return (0D) <CR>

0D

Purpose:

Causes the cursor to move to the leftmost position of the current line. This command stops the scrolling alphanumeric message if the cursor position is on the top line when this command is sent.

Test (0F) <SI>

0F

Purpose:

Causes the first 40 characters in the currently selected character set to be displayed once. At the end of the test, a test pattern is written that turns all pixels ON. At the end of the test, the display is cleared and is reset to the power-on state as described at “Reset (1F) <US>” on page A-7.

Display position (10) <DLE>

10nn

Purpose:

Changes the cursor position. The byte that follows the command byte indicates the character position where the next data-string write operation is to start. Any values greater than X'27' are ignored and the cursor position remains unchanged. This command stops the scrolling alphanumeric message if the cursor position is on the top line when this command is sent.

X'00'	Top left
X'13'	Top right
X'14'	Bottom left
X'27'	Bottom right

Normal-display control mode (11) <DC1>

11

Purpose:

Sets normal display-control mode (DC1) and permits data to be written to either line. After a character is written, the cursor moves one position to the right. When the display position is at the last position of the top line, the cursor moves to the first position of the bottom line. When the display position is at the last position of the bottom line, the cursor moves to the first position of the top line. The display remains in DC1 mode until a DC2 mode command is issued, a reset command is issued, or power is removed from the display.

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