1406



     found in location 650 ($28A). Location 61 ($3D) points to the
     current byte being written or read.
     CASBUF is also used in the disk boot process; the first disk
     record is read into this buffer.

     A cassette record consists of 132 bytes: two control bytes set to 85
     ($55; alternating zeros and ones) for speed measurement in the
     baud rate correction routine; one control byte (see below); 128
     data bytes (compared to 125 data bytes for a disk sector), and a
     checksum byte. Only the data bytes are stored in the cassette
     buffer. See De Re Atari for more ~nformaUon on the cassette
     recorder.


CONTROL BYTE VALUES

Value      Meaning
250 ($FA)  Partial record follows. The actual number of bytes is stored
           in the last byte of the record (127).
252 ($FC)  Record full; 128 bytes follow.
254 ($FE)  End of File (EOF) record; followed by 128 zero bytes.

---------------------------------------------------------------------------
Locations 1152 to 1791 ($480 to $6FF) are for user RAM (outer
environment) requirements, depending on the amount of RAM
available in the machine. Provided you don't use the FP package or
BASIC, you have 640 ($280) free bytes here.
Locations 1152 to 1279 ($480 to $4FF) are 128 ($80) spare bytes.
The floating point package, when used, requires locations 1406 to 1535
($57E to $5FF).

1406           57E            LBPR1
     LBUFF prefix one.

1407           57F            LBPR2
     LBUFF prefix two.

1408-1535      580-5FF        LBUFF
     BASIC line buffer; 128 bytes. Used as an output result buffer for
     the FP to ASCII routine at 55526 ($D8E6). The input buffer is
     pointed to by locations 243, 244 ($F3, $F4).

1504           5E0            PLYARG
     Polynomial arguments (FP use).

1510-1515      5E6-5EB        FPSCR
     FP scratch pad use.

1516-1535      5EC-5FF        FPSCR1
     Ditto. The end of the buffer is named LBFEND.