Character Set Extension; Seven-Bit Environment - Texas Instruments 880 User Manual

•
A transmitted default configuration report appears
in the following form:
[880; 14;27;36;41 c
where 14, 27, 36, and 41 are configuration codes
(see Table 3-1). A transmitted status report
appears in this form:
[880;AB;CD;EF; ... ;YZn
where AB, CD, etc. are error codes (see Table 4-1).
5.4 CHARACTER SET EXTENSION
The Model 880 Printer structure allows you to
define the contents of the "in-use" character set
table. The in-use table is the table of characters
currently being printed. The contents of the in-
use table can be entirely replaced by alternate
character sets, or individual characters in the in-
use table can be replaced by individual charac-
ters invoked from alternate character sets. There
are four possible alternate character sets, called
GO, G1, G2, and G3.
NOTE
Character set extension is possible
only if optional character sets are
installed on the Applications Con-
troller board.
BITS
4321
BITS
0000 0
0001 1
0010
2
0011 3
0100 4
0101 5
0110 6
0111 7
1000 8
1001 9
1010 A
1011 B
1100 C
1101 D
1110 E
1111 F
1<:- COLUMNS-:> I
<--
ROWS
--:>
I
8 7 6 5 4 3 2
DATA BYTE
7 0 0 0 0 1 1 1 1
6 0
0 1 1 0 0 1 1
5 0 1 0 1 0 1
0
1
0 1 2 3 4 5
6
7
~C
-
r--
O -
_ N _
_ T _
_ R _
_ 0 _
G-SET
_ L _
r -
-
r - S -
~E_
r - T -
I
I
2222627-24
Figure 5-1. Seven-Bit Character Set Table
5.4.1 Seven-Bit Environment
Configuration codes 31, 32, 35, 36, 37, and 38
define a 7-bit environment. Seven data bits define
a 128-character in-use table containing control
characters in columns 0 and 1 and printable char-
acters in columns 2 through 7. The area defined
by columns 2 through 7 is called the GL (G-Ieft)
character set. The decimal equivalents of the
binary numbers formed by bits 1 through 4 are the
row numbers, and the decimal equivalents of the
binary numbers formed by bits 5 through 7 are the
column numbers. See Figure 5-1.
5-7