Acorn Computers Limited PLUS 1, User Manual

Page: 27 / 30

Appendix A 21
*FX21,X
Flushes (empties) the buffer specified by the second parameter, as follows:
*FX21,0
— flushes the keyboard buffer
*FX21,3
— flushes the printer output buffer
*FX21,4-7
— flush sound output buffer number 0, 1, 2 or 3
*FX140,X
Selects the cassette filing system, with any value of X.
*FX163,128,X
Enables or disables input/output through the Plus 1:
*FX163,128,0
— enables printer and ADCs
*FX163,128,1
— disables printer and ADCs
*FX225,X
Changes the effect of typing the user-defined function keys as follows:
*FX225,0
— ignores the function keys
*FX225,1
— the function keys will generate the character string defined by the user
*FX225,2-255
— the function keys will generate an ASCII code based on the second
parameter f1 generates a code one more than the second parameter, f2 a code two more, etc
*FX226,X
Changes the effect of typing function keys in the range A to P, as follows:
*FX226,0
— ignores function keys in this range
*FX226,1
— function keys in this range will generate the BASIC keywords marked on their
keycaps
*FX226,2-255
— function keys in this range will generate an ASCII code based on the
second parameter FUNC
A
produces a code the same as the second parameter, FUNC B a code
one higher, etc