Epson PX-8 User Manual page 114

CONST is the entry point for the subroutine which reads the console status
and sets it in register A.
Return Parameter
Register A OOH Indicates that the console input buffer is empty.
Register A
=
FFH Indicates that the console input buffer contains
characters.
1iI"~@'
Entry Point: WBOOT
+
06H
CONIN is the entry point for the subroutine which enables a character to be
input from the keyboard. It loops indefinitely until a character is entered when
the buffer is empty. Because it is also possible to press the Programmable Func-
tion keys, special provision is made for them as follows.
Return Parameters
Register A contains the ASCII code of the input character if a key other than
a PF key is pressed.
The FUNKFLG (address F108H) setting determines the contents of register A
when a PF key is pressed.
If
FUNKFLG is set to FFH, registers A and C contain the following data:
Register C Register A
Code returned by the PF keys
PF key pressed
FFH
Code as in table
of right
PFI EOH PF6 E5H
PF2 ElH PF7 E6H
OTHER KEY
OOH ASCII code
pressed
PF3 E2H PF8 E7H
PF4 E3H PF9 E8H
PF5 E4H PFIO E9H
If
FUNCFLG is not set to FFH (normally it will be 0), then register A will con-
tain the ASCII code of the key pressed if a key other than a PF key is pressed,
and will contain the first character of the PF key string if a PF key is pressed.
Continuous polling of the keyboard will cause the other characters to be en-
tered from the PF key string as if they were typed from the keyboard.
"'·m·
I .. 1
Entry Point: WBOOT
+
09H
5-12
CONOUT is the entry point for the subroutine which outputs a character to
the console from register C. Note that a number of functions can be obtained
by using the control codes in Appendix E and also the ESC control sequences
in Appendix A.
Entry parameter
Register C
=
ASCII code of character to be output to the console
5.7.4 BIOS subroutines for use with devices
Entry point: WBOOT
+
OCH
LIST is the entry point for the subroutine which outputs a character to the log-
ical device LST:. It will be output if both DSR and TxRDY are" 1 " , otherwise
will wait until these conditions are satisfied.
Entry parameter
Register C
=
ASCII code of character to be output to LST:
Entry Point: WBOOT
+
OFH
PUNCH is the entry point for the subroutine which outputs a character to the
logical device PUN:.
Entry parameter
Register C
=
ASCII code of character to be output
'j1:t!nljAi
Entry Point: WBOOT
+
12H
READER is the entry point for the subroutine which reads a character from
the logical device RDR:. This subroutine loops until a character is input.
Return Parameter
Register A
=
ASCII code of character input from RDR:
5-13
I