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Copyright :FOETfl <strong>Interest</strong> <strong>Group</strong> SSB MNEMOMC RSSmm PAGE 4<br />
OOEO<br />
OOEO<br />
OOEE<br />
OOEB<br />
OOEC<br />
OOEE<br />
OOFO<br />
00F2<br />
00 F4<br />
00F6<br />
* * *<br />
*<br />
* (XXVEWIONS USED IN THIS PROGRAM ARE AS FOUS:<br />
*<br />
* IP points to the current instruction ( pre-increment mode )<br />
* RP points to second free byte (first free word) in return stack<br />
* SP (hardware SP) points to first free byte in data stack<br />
*<br />
* when A and E hold one 16 bit <strong><strong>FOR</strong>TH</strong> data word,<br />
* A contains the high byte, B, the low byte.<br />
* * *<br />
ORG $EO variables<br />
used as scratch by (FIND) ,J!XLOSE,CM3VE,EMIT,KEY,<br />
SP@ , mp,ms> ,COLD<br />
These locations are used by the TRACE routine :<br />
TRLIM RMB 1 the count for tracing without user intervention<br />
TRF.CEM RME 1 non-zero = trace mode<br />
BRKPT RMB 2 the breakpoint address at which<br />
* the program will go into trace mode<br />
VECT RMB 2 vector to machine code<br />
* (only needed if the TRACE routine is resident)<br />
W<br />
I P<br />
RF'<br />
UP<br />
*<br />
Registers used by the MRTH virtual machine:<br />
Starting at SOOFO :<br />
RMB 2 the instruction register points to <strong>6800</strong> code<br />
RME 2 the instruction pointer pints to pinter tc <strong>6800</strong> ~ 2 s<br />
RMB 2 the return stack pointer<br />
RMB 2 the pointer to bese of current user's 'USE3' table<br />
( altered during multi-tasking )
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