On Sun, 2013-10-06 at 08:46 -0700, Mark Pizzolato - Info Comm wrote: > On Sunday, October 06, 2013 at 7:54 AM, Peter Onion wrote: > > I'm just having a look at porting an existing emulation into the simh > > framework. > > > > My first problem is that there seems to be no way to provide a custom > > "print" routine for the value of the PC. > > > > Why do I need one ? > > > > Because the least significant bit of the Sequence Control Register in my > > machine has the value "half" as there are 2 instructions in each word. > > > > I'm sure I'll have lots more questions soon ! > > Hi Peter, > > Actually there is a custom way to display the contents of any simh device > register. > > This is available on the most recent simh codebase on github: > https://github.com/simh/simh > > In the latest code, registers can have an optional bit field description for > the register. The bitfields can be formatted in a variety of flexible ways. > > An example of a register which uses a custom formatting paradigm is the PSL > register definition in the VAX CPU module at > https://github.com/simh/simh/blob/master/VAX/vax_cpu.c > > FYI a zip of the current code base is available at: > https://github.com/simh/simh/archive/master.zip > > Please come back with more questions as you encounter them. >
I'll reply to the list this time ! Ok, so I guess this is done via HRDATADF and the psl_bits definition ? HRDATADF is not mentioned in the docs and from that one example it is rather hard to see how to use it to do what I need. I have a 14 bit SCR register and I want to print ((SCR >> 1) & 8191) and a decimal, and add a "+" on the end if ((SCR & 1) == 1). I've tried to define my PC using HRDATADF, and it picks up the name string OK but it isn't doing anything with the bit/field definitions as far as I can tell, it's still just printing it out a decimal. Peter Onion Elliott 803 Team leader The National Museum of Computing _______________________________________________ Simh mailing list [email protected] http://mailman.trailing-edge.com/mailman/listinfo/simh
