Epson PX-8 User Manual page 128

A-2 Use of the ESCAPE Code Control Sequences
Where numeric codes must be given from the keyboard (shown as n or m in
the escape sequence - these are ASCII codes) the key or key combination giv-
ing that code can be found in the table in Appendix E. Some sequences cannot
be obtained direct from the keyboard. Also some control codes (e.g. CTRL-M
which is equivalent to pressing the RETURN key) will function normally and
so terminate the input.
Example 1 ESC control sequence from the CP 1M command line
The following example shows how to turn the cursor off and then back on again
on the CP 1M command line.
Press the ESC key followed by the number "2" then press the RETURN key.
The display will show:
A>"[2 RETURN
?
A>
with no cursor after the CP 1M prompt. To make the cursor display return,
type the ESC key followed by the number "3". The question mark in either
case means CP/M does not understand the command.
Example 2 The Use of the CONOUT routine
The CONOUT routine (section 5.7.3) be used to execute the console ESC se-
quences, for example to change the cursor to non flashing.
LD C.IBH
CALL CONOUT
LD C. D6H
CALL CONOUT
LD C. OlH
CALL CONOUT
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A-3 The ESC Sequences
ESC "070"
Reads the character corresponding to the specified code from the character gener-
ator ROM and displays it at the present cursor position in the currently select-
ed screen (in the virtual screen for modes 0, 1, and 2, and in the real Screen
for mode 3). The sequence is as follows:
Keyboard ESC, OJo,n
Decimal 27,37,n
Hexadecimal IB,25,n
The value of n is the ASCII code corresponding to the character to be displayed.
This code cannot be obtained directly from the keyboard.
ESC"
*"
Clears the currently selected screen and moves the cursor to the home position.
The
I
CLR
I
key or
I
CTRL
I -
[iJ performs the same function.
Keyboard ESC,
*
Decimal 27,42
Hexadecimal IB,2A
ESC "2"
Turns off display of the cursor. However, the cursor is still present even though
it cannot actually be seen.
Keyboard ESC,2
Decimal 27,50
Hexadecimal IB,32
The cursor can also be turned on and off by using the CONFIG program.
ESC "3"
Turns on the cursor.
Keyboard ESC,3
Decimal 27,51
Hexadecimal IB,53
A-S
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