APPENDIX TWELVE



     Byte          Hex         Use
     55308         D80C        Device name in ASCII
                               (optional)
     55309/55310   D80D/D80E   Open vector LSB-1/MSB
     55311/55312   D80F/D810   Close vector LSB-1/MSB
     55313/55314   D811/D812   Get byte LSB-1/MSB
     55315/55316   D813/D814   Put byte LSB-1/MSB
     55317/55318   D815/D816   Status vector LSB-1/MSB
     55319/55320   D817/D818   Special vector LSB-1/MSB
     55321         D819        JMP
     55322/55323   D81A/D81B   Init vector LSB/MSB
     55324         D81C        Unused

     On a cold start, the OS polls for parallel devices, and if it finds
     one, JMPs (through 55321; $D819) to the INIT routine at
     55322/55323 ($D81A, $D81B) which places the address of the ge-
     neric parallel device handler into the handler tables with the
     device name.

57344-58367    E000-E3FF      CHARSET1
     Standard (domestic) character set; default on power-up or RE-
     SET; pointed to by 756 (S2F4).

58368-65535    E400-FFFF      OS
     The OS has been considerably rewritten and changed since the
     400/800. The ANTIC, PIA, and POKEY chips are the same, but
     many OS routines have been moved. The vectors in RAM have
     remained in place for the most part, so software which avails it-
     self of these locations can run on all machines, Always use the
     vectors when writing software to use OS routines, never the ac-
     tual routines themselves; they may change, while the vectors
     will not.

     Locations 58368-58495 ($E400-$E47F) still contain the vector ta-
     bles. but point to different locations than the 400/800 (for more
     information, refer back to the 400/800 section). The vectors (ex-
     cept JMP) all point to the address of the routine minus 1:

     Device & Loc      Open    Close  Get    Put    Status Special JMP to
     E:  58368 $E400   EF93    F2D2   F249   F2AF   F21D   F2C2    EF6E
     S:  58384 $E410   EF8D    F2D2   F17F   F1A3   F21D   F9AE    EF6E
     K:  58400 SE420   F21D    F21D   F2FC   F22C   F21D   F22C    EF6E
     P:  58416 $E430   FEC1    FF06   FEC0   FECA   FEA2   FEC0    FE99
     C:  58432 $E440   FCE5    FDCE   FD79   FDB3   FDCB   FCE4    FCDB

     The JMP vectors in locations 58448-58583 ($E450-$E4D7) remain
     the same, but point to new vector addresses: