Apple IIe - Page 304

304 Apple lie Users Handbook
output before executing this subroutine. X = 00 corresponds to
256 blanks.
PRBYTE ($FDDA/64986) A = ?? X = -- Y = --
PRBYTE outputs the hexadecimal value stored in the accumula-
tor to the current output device.
PREAD (FB1 E/64286) A =?? X = -- Y =value of controller
PREAD reads the hand control specified in the X-register (0 -3). It
then returns that value in the Y-register.
PRHEX ($FDE3/64995) A=?? X = -- Y = --
PRHEX outputs the lower nibble of the accumulator , one hex
digit , to the current output device.
PRNTAX ($F941/63809) A=?? X = -- Y = --
PRNTAX outputs a four digit hex number. The upper two digits
must be stored in the accumulator. The lower two digits must be
stored
in the X-register.
RDCHAR ($FD35/64821) A=?? X = ?? Y = ??
RDCHAR is another input subroutine that retrieves characters
from the standard input subroutine . RDCHAR also interprets
ESCAPE codes.
RDKEY ($FDOC/64780) A =character X = -- Y = --
RD KEY calls the input subroutine. The input subroutine's
starting address must be stored in locations $38-$39. This routine
is usually KEVIN.
READ ($FEFD/65277) A=?? X = ?? Y = ??
READ converts a series of tones into digital data and then stores
this data. The
following locations must contain pointers before