BOB-3 Version 3.4 Application Guide ~ Copyright © 2004 by Decade Engineering ~ Page 11
{Un
Background color for RAM characters (local mode). “n” = 0~7. Defaults to 4 (blue). See
{Q
commands for important details!
{VE
&
{VD
Enable/Disable text crawl (horizontal scroll). When enabled, only a single line of text is displayed.
Incompatible with vertical scrolling. Oversize characters are allowed. Do not change the mode or
polarity of output ports P0~P5 during crawl mode–when
{VD
is transmitted, they will be reset to
the values in effect when
{VE
was sent. Color and blink controls are ‘global’ in crawl mode. P5
output must be available. Supplemental circuitry is required; see System Hookup section.
{VLnn
Sets crawl line number. “nn” = 00~16. Defaults to 16 (bottom of screen).
{VRn
Crawl rate control. “n” = 0~2. Defaults to 1.
{VW<data>}
Writes crawl buffer. Character string length may be up to 256. Do not embed any commands in
the character string.
{Ynn<data>
Similar to
{P
, but loads a single RAM character bitmap. “nn” = 00~62. Must be followed by exactly
26 bytes of data.
{ZCn
<CR>
clears to end of line if “n” = 1. “n” defaults to 0, for normal
<CR>
behavior.
{ZPnn
Sets new print position starting column (after
<CR>
). “nn” = 00~39. Default = 00.
{1D
Restores default display width value (9F).
{1Shh
Sets display width. “hh” is a 2-digit hex number in the range of 36~C6. Defaults to 9F. Note: [1]
Characters can distort sync if they go off screen. [2] Use
{HH
command to fix horizontal position.
{2C
&
{2L
Sets
<CR>
or
<LF>
to trigger the normal carriage return and line feed response.
<CR>
is default.
Notes:
o
In genlock/overlay mode, any color specification other than black causes a white display. The color controls
operate normally only in local video generation mode. Command color parameters are as follows:
“n” Color
0 Black
1 Red
2 Green
3 Yellow
4 Blue
5 Magenta
6 Cyan
7 White
o
RAM characters are not treated the same as ROM characters in the display. Outlines and blinking are not
available. See
{I
,
{Q
and
{U
commands for additional discussion. Include a space character in custom
character sets, to avoid frequent
{T
mode switching. The space character at 3F in RAM behaves like the
space character at FF in ROM. They both show screen color instead of character cell background color.
o
Version 3.4 vertical scroll mode changes: If print position is set to a row outside the scroll block, the
command is now accepted. To restore print position to the scroll line, issue the scroll enable command
{JE
, or set the print position within the scroll block using
{Cxxyy
(“yy” is ignored in favor of the active scroll
line, but it must be present). If the current print position is within a scroll block,
<CR>
triggers a scroll and
moves the print position to the beginning of the new line. A
<CR>
that moves the print position into the
scroll block (from the last line of a non-scrolling area into the top line of a scroll block) also moves the print
position to the active scroll line.
o
Starting with firmware version 3.0, command exceptions cause the command processor to abort. BOB-3
emits
{?<CR
> as in previous firmware versions, but does nothing else in response to the faulty command.
