762



762            2FA            CHAR
     Internal code value for the most recent character read or written
     (internal code for the value in ATACHR below). This register is
     difficult to use with PEEK statements since it returns the most
     recent character; most often the cursor value (128, $80 for a
     visible, zero for an invisible cursor).

763            2FB            ATACHR
     Returns the last ATASCII character read or written or the value of
     a graphics point. ATACHR is used in converting the ATASCII
     code to the internal character code passed to or from CIO. It also
     returns the value of the graphics point. The FILL and DRAW
     commands use this location for the color of the line drawn,
     ATACHR being temporarily loaded with the value in FILDAT,
     location 765; $2FD. To force a color change in the line, POKE the
     desired color number here (color * sixteen + luminance). To see
     this register in use as character storage, try:

     10 OPEN#2,4,0,"K:"
     20 GET#2,A
     30 PRINT PEEK(763);" "; CHR$(A)
     40 GOTO 20

     Make sure the PEEK statement comes before the PRINT CHR$
     statement, or you will not get the proper value returned. When
     the RETURN key is the last key pressed, ATACHR will show a
     value of 155.

764            2FC            CH
     Internal hardware value for the last key pressed. POKE CH with
     255 ($FF; no key pressed) to clear it. The keyboard handler gets
     all of its key data from CH. It stores the value 255 here to indicate
     the key code has been accepted, then passes the code to CH1,
     location 754 ($2F2). If the value in CH is the same as in CH1, a
     key code will be accepted only if the proper key debounce delay
     time has transpired. If the code is the CTRL-1 combination (the
     CTRL and the "1" keys pressed simultaneously), then the
     start/stop flag at 767 ($2FF) is complemented, but the value is not
     stored in CH. The auto repeat logic will also store store key
     information here as a result of the continuous pressing of a key.
     This is neither the ATASCII nor the internal code value; it is the
     "raw" keyboard matrix code for the key pressed. The table for
     translation of this code to ATASCII is on page 50 of the OS User's
     Manual. In a two-key operation, BIT 7 is set if the CTRL key is
     pressed, BIT 6 if the SHIFT key is pressed. The rest of the bytes
     are the code (ignored if both BITs 7 and 6 are set). Only the code
     for the last key pressed is stored here (it is a global variable for