Atari ST series Technical Reference Manual page 305

Unlike GEM
output any character for which there is image data, the con­
sole device screen emulates a DEC VT-52 display terminal,
and treats the ASCII characters from 0 to 31 as nonprinting
control characters. This means that it interprets the ASCII
character 13 as a carriage return, an instruction to move the
cursor to the beginning of the line, rather than as a character
that should be printed. There are a number of VT-52 escape
codes to which the console device responds. These escape
sequences are strings of characters beginning with the ASCII
character 27 (Esc), followed by one or more text characters.
The VT-52 codes to which BconoutQ responds are:
Esc A
Esc B
Esc C
Esc D
Esc E
Esc H
Esc I
Esc J
Esc K
Esc L
Esc M
Esc Y
(row + 32)
(column + 32)
Esc b (register)
Esc c (register)
Esc d
Esc e
Esc f
Esc j
Esc k
Esc 1
graphics text functions, which
Cursor Up
Cursor Down
Cursor Right
Cursor Left
Clear Screen and Home Cursor
Home Cursor
Cursor Up (scrolls screen down if at top line)
Clear to End of Screen
Clear to End of Line
Insert Line
Delete Line
Position Cursor at Row, Col (starts with 0)
Select Foreground (Character) Color
Select Background Color
Clear to Beginning of Screen
Cursor On
Cursor Off
Save Cursor Position
Move Cursor to Saved Position
Clear line
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