On Sat 29 Sep 2018 at 23:17:39 -0700, David Holz wrote: > On 09/29/2018 12:20 PM, didier derny wrote: > > I'm rewriting my own monitor... > > > > any idea of the logic to use to trace 6502 instructions without > > hardware help > > If you mean single-stepping, and without modded hardware, two ideas come > to mind: > > 1) Use a timer to trigger an interrupt such that it will fire after you > RTI back into the "running" program, allowing 1 instruction to execute. > Hope that the program/OS doesn't use that timer or SEI if it's not an NMI. This is I think what several existing monitors do. It isn't included in my KosMon, it seems, so you'll have to look in MicroMon or some other monitor for details. -Olaf. -- ___ Olaf 'Rhialto' Seibert -- "What good is a Ring of Power \X/ rhialto/at/falu.nl -- if you're unable...to Speak." - Agent Elrond
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