Epson FX-80 Operation Manual page 55

(7) How to send control codes
Printing and other functions are controlled by inputting control codes such as CR,
ESC -, etc. .
Control codes may be broadly divided into the following two categories.
(1) i-byte control codes
(2) Control codes expanded by an ESC code
In BASIC, control codes can be sent to the printer as follows.
(Example 1) To send BEL code,
LPRINT CHR$(7);
<beep>
(Example 2) To send ESC - (1)0 code,
LPRINT CHR$(27);"-";CHR$(1);
(8) Input buffer
The printer is capable of storing up to 2k bytes of data in its input buffer for quick
data proceessing. This function is enabled by setting DIP switch pin 1-4 ON.
When DIP switch pin 1-4 is OFF, the 2k bytes input buffer is used as a RAM area
for the Download CG.
Print
(CR, LF, etc.)
bemg stored m
input buffer
Host Input
Print data
Print
computer
l
buffer (2k)
J
buffer
'-
Da~a
input
wi~hout
Control codes
I
(
Normally, data from the host computer is sent to the printer without being stored in
the input buffer, as shown in the figure above.
When the input buffer function is enabled by setting the DIP switch, all the data
output from the host computer will be stored first in the input buffer before being
sent to the printer.
I
\
.
3-4