Specifications

172 AMD Geode™ GeodeROM Functional Specification
Video BIOS Support
32087C
13.1.14 Function 0Dh - Read Dot
Description:
Returns the color of the pixel at the specified location in graphics mode. This function has no effect in text mode.
Passed:
Returns:
None.
13.1.15 Function 0Eh - Write TTY
Description:
Writes a character to the display at the current cursor position. The cursor position is updated to the next available
position. If the cursor is at the end of the line, then the cursor is placed at the beginning of the next line. If the cursor is
at the end of the screen, then the entire display is scrolled up one line and the cursor is placed at the beginning of the
last line.
Several control characters have an effect on the cursor position without writing an actual character to the display. The
bell character (ASCII 07h) beeps the speaker once without changing the cursor position. The backspace character
(ASCII 08h) moves the cursor back one position on the line unless the cursor is already at the beginning of the line. At
that point the backspace has no effect. The line feed character (ASCII 0Ah) moves the cursor down one row without
changing the column position. If the cursor is already at the bottom of the screen, the display is scrolled up one line.
The carriage return (ASCII 0Dh) moves the cursor position to the beginning of the current line.
Passed:
Returns:
None.
Parameter Description
AH 0Dh
DS Seg0
AL Pixel color
BH Page
CX Column
DX Row
Parameter Description
AH 0Eh
DS Seg0
AL Character to write to TTY device
BL Foreground color in graphics mode