Antic Magazine 1982 December/Antic_December_1982_Vol_1_No_5.atr/forthfa5.txt

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( 60 ANTIC ISSUE #5  SCREEN #1               )¢0 VARIABLE IOCB# ( AN INDEXING CLOBAL VARIABLE )¢¢: IOCBX IOCB# @ 16 * ;¢  ( BYTE OFFSET FROM IOCB 0 )¢¢HEX¢CODE CALL -CIO¢XSAVE STX, 0 ,X LDA, TAX, ( TOP STACK IN TO X REG)¢E456 JSR, XSAVE LDX, POP JMP, ( CIO VECTOR DROP TOP STACK )¢END-CODE¢¢: SERVES.AS ( DEFINING WORD )¢  <BUILDS , ( COMPILE BASE ADDR FOR CONTROL BLOCK 0)¢     DOES> @ IOCBX + ; ( GET BASE ADDR ADD OFFSET )¢( 61 ANTIC #5                                                                     )¢( BUILD ACCESS WORDS )¢HEX¢342 SERVES.AS COMMAND ( BYTE LOCATION )¢343 SERVES.AS STATUS     ( BYTE )¢344 SERVES.AS BUFF-ADDR ( 16BIT WORD )¢348 SERVES.AS BUFF-LEN    (  WORD  )¢34A SERVES.AS AUX1   ( BYTE )¢34B SERVES.AS AUX2   ( BYTE )¢¢: GETCHR.  ( GET CHAR FROM ANY DEVICE)¢7 COMMAND C! HERE BUFF-ADDR !¢1 BUFF-LEN ! ( SETUP CONTROL BLACK )¢IOCBX CALL-CIO HERE C@ ;¢( LEAVE CHAR VALUE ON STACK )¢¢( 62 ANTIC #5                                                        )¢0 VARIABLE V#   ( INDEXING VARIABLE )¢: VOICE V# ! ;¢: SOUNDS ( ARRAY OF VALUES )¢  <BUILDS HERE OVER ERASE ALLOT ( CLEAR LOCATIONS )¢   DOES> V# @ + ; ( GET BYTE LOCATION RELATIVE TO V# )¢¢( VALUES ARE COMBINED AND SENT TO HARDWARE REGISTERS )¢4 SOUNDS VOLUME¢4 SOUNDS PITCH¢4 SOUNDS DISTORTION¢¢( ARRAY USED BY 4 VOICE SEQUENCER        )¢4 SOUNDS BUSYFLAG¢4 SOUNDS SEQUENCELENGTH¢4 SOUNDS CURRENTSTEP¢4 SOUNDS SEQUENCEPOINTER   ( WHICH ARRAY PROVIDES VALUES FOR V/P/D )¢