Radio Shack TRS-80 Model II Reference Manual page 199

Technical Information
VDCHAR
Video Character,(function code 8)
This routine outputs a character to the current cursor position. It is a Scroll
Mode routine, as described above.
Control Codes not listed below are ignored.
KEY
HEX FUNCTION
CODE
(fl)
01 Blinking cursor on.
(N)
02 Cursor off.
(CTRl)(][)
04 Turns on steady cursor.
(BACKSPACE)
08 Moves cursor back one position and
blanks the character at that position.
(TAB)
09 Advances cursor to next tab position. Tab
positions are at 8-character boundaries,
8,16,24,32, .. ,
(CTRUQ]
OA Line feed-cursor moves down to next
row, same column position.
(CTRl)(][)
OB Positions cursor to beginning of previous line.
Cursor will not move into the scroll-protected
area
(ENTER)
OD Moves cursor down to beginning of next line.
(CTRl)(J[)
OE Turns dual routing on.
(CTRU(]J
OF Turns dual routing off.
(CTRl)CI)
14 Homes cursor to the first non scroll-protected
position.
(CTRUOO
17 Erases to end of line, cursor doesn't move.
(CIRl)CX)
18
Erases to end of screen, cursor doesn't move.
(CTRUW
19 Sets Normal Display mode (white on black).
Remains Normal until reset by programmer.
(CTRl)W
1A Sets Reverse Display mode (black on white).
Remains Reverse until reset by programmer.
(ESC)
1B Erases screen and homes cursor (position 0).
S
1C Moves cursor back one position.
~
1D
Moves cu rsor forward one position.
(j)
1E
Sets 80 character/line and clears Display.
(I)
1F Sets 40 character/line and clears Display.
Table4.7. Received Control Codes, Code<X'20'
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