fig-FORTH FOR 6800 - Forth Interest Group

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Copyright:FDRTH Interest Group FSB MNEMClNIC ASSEMBLER PA= 3 * MEMORY MAP for this 16K system: * ( positioned so that systems with 4k byte write- * protected segments can write protect FORTH ) * * addr. contents pointer init by * **** ............................. ******* ****** substitute for disc mass memory * 320F * 4 buffer sectors of VIF?TUAL MEMORY * 3000 * >>>>>> memory from here up must be RAM
Copyright :FOETfl Interest Group SSB MNEMOMC RSSmm PAGE 4 OOEO OOEO OOEE OOEB OOEC OOEE OOFO 00F2 00 F4 00F6 * * * * * (XXVEWIONS USED IN THIS PROGRAM ARE AS FOUS: * * IP points to the current instruction ( pre-increment mode ) * RP points to second free byte (first free word) in return stack * SP (hardware SP) points to first free byte in data stack * * when A and E hold one 16 bit FORTH data word, * A contains the high byte, B, the low byte. * * * ORG $EO variables used as scratch by (FIND) ,J!XLOSE,CM3VE,EMIT,KEY, SP@ , mp,ms> ,COLD These locations are used by the TRACE routine : TRLIM RMB 1 the count for tracing without user intervention TRF.CEM RME 1 non-zero = trace mode BRKPT RMB 2 the breakpoint address at which * the program will go into trace mode VECT RMB 2 vector to machine code * (only needed if the TRACE routine is resident) W I P RF' UP * Registers used by the MRTH virtual machine: Starting at SOOFO : RMB 2 the instruction register points to 6800 code RME 2 the instruction pointer pints to pinter tc 6800 ~ 2 s RMB 2 the return stack pointer RMB 2 the pointer to bese of current user's 'USE3' table ( altered during multi-tasking )
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fig-FORTH FOR 6800 - Forth Interest Group

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