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When using LB, the end of the text must be terminated. If the text is not terminated, instructions and other text
following the actual label statement are displayed on the CRT The label mode can be terminated with an ASCII
end-of-text code (decimal code 3), or with a character specified by the DT command. The label terminator
command, DT suffixed with the character selected as the terminator (see line 30 above), must precede the label.
The terminator character itself must immediately follow the label.
The character codes listed below provide special label functions. Instructions for a particular function are normally
given in the function's decimal code.
Code
l
8
10
11
12
13
17
18
32
145
146
147
Abbreviations within the parenthesis are shorthand notation for writing display programs. They are
l
gramming codes.
A blink-on instruction causes the label statement to blink until a subsequent blink-off or end-of-text instruction in
the program is executed.
For the skip-to-next-block instructions, the 4096 addresses in the display memory are hypothetically divided into
256 blocks of 16 addresses each. Execution of a skip instruction causes the program to skip to the fist address in
the next higher block of 16 addresses (code 145)) to skip over the next two higher blocks to the fist address in the
third higher block (code 146)) or to skip over four blocks to the first address in the fifth higher block (code 147).
For example, if the program is at any address from (b through 15 (the fist block of 16 addresses) and a
skip-to-next-16-b&k is executed, the program skips to address 16 (the fist address in the second block of 16
addresses). Similarly, if the program is at address 84 in the sixth block of 16 addresses, and a skip-to-next-32-block
is executed, the program skips over two blocks of 16 addresses to address 128 (the fist address in the ninth block).
Again, if the program is at address 84 in the sixth block, but the instruction this time is for a skip-to-next&l-block,
the program skips over four blocks to address 160 in the eleventh block of 16 addresses.
Function
l
l
null
back space (BS)
line feed
vertical tab (opposite of line feed) (VT)
form feed (move beam to f&O) (FMFD)
carriage return (CR)
blink on (bkon)
blink off (bkof)
space (SP)
skip to next higher block of 16 addresses (sk 16)
skip to third higher block of 16 addresses (sk 16)
skip to fifth higher block of 16 addresses (sk 64)
(Continued) LB
not
pro-
Programming 2 13
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