[Simh] Custom PC formatting

[Peter Onion]

On Sun, 2013-10-06 at 11:48 -0700, Mark Pizzolato - Info Comm wrote:
> On Sunday, October 06, 2013 at 10:39 AM, Peter Onion wrote:
> > > No problem, we are now narrowing in on the right question.
> > >
> > > To address this issue, your simulator should provide a
> > "sim_vm_fprint_addr" routine.  This routine has a signature of:
> > >
> > > void sim_vm_fprint_addr (FILE *st, DEVICE *dptr, t_addr addr);
> > >
> > > The LGP simulator uses this interface.  Look there for details.
> > >
> > > - Mark
> > >
> > 
> > I'll give it a try, but I fear that is not going to be the right answer
> > because normal addresses (as in the address field in instructions) are
> > only 13 bits and don't have the "half bit" at the least significant end.
> > It is only the SCR that has the extra bit.
> > 
> > The machine has 8K words, but 16K instructions !
> 
> If that does not work for reasons you've just described, then there are
> still a couple more approaches:  One alternative might be to leverage
> the SIM_SW_STOP flag switches which your fprint_sym routine will be
> invoked with when the simulator stops execution.
> 
> The last alternative would be for your sim_instr routine can handle
> any/all message generation prior to returning to the scp framework and
> set the SCPE_NOMESSAGE bit in the return status.  This will suppress
> scp's message generation for any command which invokes run_cmd (i.e.
> START, RUN, GO, STEP, etc.).  
> 
> This may be messier depending on the set of conditions you exit
> sim_instr with.  You may want to copy  parts of run_cmd_message and
> fprintf_stopped_gen from scp.c to implement your message generation.
> 
> - Mark
> 

Ok, thinks for those ideas Mark.   

Currently I'm having to wrestle with the non-standard integer types that
are defined in sim_defs.h   All my code uses the types defined
in /usr/include/stdint.h   which is consistent with it's naming upto 64
bits, where as the defines in sim_defs.h are not consistent (uint32 but
t_uint64).  And /usr/include/stdbool.h is the way to go for booleans !

Peter Onion
Elliott 803 Team leader 
The National Museum of Computing