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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Simh doesn’t expose any abstraction of the internal details at the level you are mentioning. Emulation at that level for each processor and/or device was never a direct goal. However, there certainly are some parallels to how the original hardware behaved internally which you are welcome to explore using a debugger on the simulator itself. You can set breakpoints at the components which reference memory and/or within the code which implements the device interface which the operating system expects to see.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>In theory, you could add code to the memory reference code path to update a blinken light display, but this would horribly impact simulator performance, and you still wouldn’t have a stepping ability at the bus cycle level.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>In theory, you could restructure the PDP11 simulator to execute bus cycles instead of instructions. I think this would be a very significant amount of work, and would then still run much slower even if no blinken light display was being driven.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>On the other hand, if you’re not really trying to drive a blinken light display, you can get a lot of detailed information from the pdp11 simulator using the instruction history capability:<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> sim> set cpu history=100<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> sim> set bre <someaddr><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> sim> set bre 14302<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> sim> b rq0<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> Breakpoint, PC: 014302 (JMP 14064)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> sim> show cpu hist<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> PC PSW src dst IR<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> 032142 030001| 000001 DEC R0<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> 032144 030005|032144 140010 MOV #0,R2<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> 032150 030001|024600 000001 MOV R5,R1<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> 032152 030001|032152 024600 ADD #0,R1<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> 032156 030000|000000 000040 CMP R0,R2<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> 032160 030011| BCS 32214<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> 032214 030011| 000040 ASR R2<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> 032216 030000|000000 000020 CMP R0,R2<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> 032220 030011| BCS 32234<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> 032234 030011| 000000 ASL R0<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> [..etc..]<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Mark<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Doug Snyder [mailto:dsnyder@blueshiftinc.com] <br><b>Sent:</b> Wednesday, September 04, 2013 10:46 PM<br><b>To:</b> Mark Pizzolato - Info Comm<br><b>Cc:</b> simh@trailing-edge.com<br><b>Subject:</b> Re: [Simh] single cycle stepping for pdp11<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>it would be nice to see the virtual address, physical address, instruction space/data space flag and data for each cycle<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>a perfect result would be any data that would be visible and updated each bus cycle by a blinking light front panel such as a pdp11/70<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>doug<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p><p class=MsoNormal>On Wed, Sep 4, 2013 at 10:38 PM, Mark Pizzolato - Info Comm <<a href="mailto:Mark@infocomm.com" target="_blank">Mark@infocomm.com</a>> wrote:<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>OK, so the original hardware supported single cycle stepping.</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>What would expect to happen in the simulator if you stepped single cycles? What details would you want to have access to after stepping at the cycle level?</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> <a href="mailto:simh-bounces@trailing-edge.com" target="_blank">simh-bounces@trailing-edge.com</a> [mailto:<a href="mailto:simh-bounces@trailing-edge.com" target="_blank">simh-bounces@trailing-edge.com</a>] <b>On Behalf Of </b>Doug Snyder<br><b>Sent:</b> Wednesday, September 04, 2013 10:32 PM<br><b>To:</b> Mark Pizzolato - Info Comm<br><b>Cc:</b> <a href="mailto:simh@trailing-edge.com" target="_blank">simh@trailing-edge.com</a><br><b>Subject:</b> Re: [Simh] single cycle stepping for pdp11</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>many (if not all) of the pdp11 models support single cycle stepping. to more accurately model an actual pdp11, it would be nice if simh could model that feature. not being able to model that feature is certainly not the end of the world, but it is a noticeable difference.<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>doug<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>On Wed, Sep 4, 2013 at 10:15 PM, Mark Pizzolato - Info Comm <<a href="mailto:Mark@infocomm.com" target="_blank">Mark@infocomm.com</a>> wrote:<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'>On Wednesday, September 04, 2013 at 10:08 PM, Doug Snyder wrote:<br>> it appears that simh supports single instruction stepping, but not single cycle stepping for the pdp11.<br> ><br>> if this is the case, have there been attempts or requests to add single cycle support?<br><br>Hi Doug, <br><br>The core behaviors of the simh simulators are built around the execution of instructions. This is the level which things are simulated at.<br><br>What problem are you trying to solve or deal with your request to be concerned about clock cycles?<span style='color:#888888'><br><br><span class=hoenzb>- Mark</span></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div style='border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt'><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Doug Snyder [mailto:dsnyder@blueshiftinc.com] <br><b>Sent:</b> Wednesday, September 04, 2013 10:46 PM<br><b>To:</b> Mark Pizzolato - Info Comm<br><b>Cc:</b> simh@trailing-edge.com<br><b>Subject:</b> Re: [Simh] single cycle stepping for pdp11<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>it would be nice to see the virtual address, physical address, instruction space/data space flag and data for each cycle<o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>a perfect result would be any data that would be visible and updated each bus cycle by a blinking light front panel such as a pdp11/70<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>doug<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div></div></div><div><p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p><div><p class=MsoNormal>On Wed, Sep 4, 2013 at 10:38 PM, Mark Pizzolato - Info Comm <<a href="mailto:Mark@infocomm.com" target="_blank">Mark@infocomm.com</a>> wrote:<o:p></o:p></p><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>OK, so the original hardware supported single cycle stepping.</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>What would expect to happen in the simulator if you stepped single cycles? What details would you want to have access to after stepping at the cycle level?</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><div style='border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt'><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> <a href="mailto:simh-bounces@trailing-edge.com" target="_blank">simh-bounces@trailing-edge.com</a> [mailto:<a href="mailto:simh-bounces@trailing-edge.com" target="_blank">simh-bounces@trailing-edge.com</a>] <b>On Behalf Of </b>Doug Snyder<br><b>Sent:</b> Wednesday, September 04, 2013 10:32 PM<br><b>To:</b> Mark Pizzolato - Info Comm<br><b>Cc:</b> <a href="mailto:simh@trailing-edge.com" target="_blank">simh@trailing-edge.com</a><br><b>Subject:</b> Re: [Simh] single cycle stepping for pdp11</span><o:p></o:p></p></div></div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>many (if not all) of the pdp11 models support single cycle stepping. to more accurately model an actual pdp11, it would be nice if simh could model that feature. not being able to model that feature is certainly not the end of the world, but it is a noticeable difference.<o:p></o:p></p><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>doug<o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p></div></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'> <o:p></o:p></p><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>On Wed, Sep 4, 2013 at 10:15 PM, Mark Pizzolato - Info Comm <<a href="mailto:Mark@infocomm.com" target="_blank">Mark@infocomm.com</a>> wrote:<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'>On Wednesday, September 04, 2013 at 10:08 PM, Doug Snyder wrote:<br>> it appears that simh supports single instruction stepping, but not single cycle stepping for the pdp11.<br> ><br>> if this is the case, have there been attempts or requests to add single cycle support?<br><br>Hi Doug, <br><br>The core behaviors of the simh simulators are built around the execution of instructions. This is the level which things are simulated at.<br><br>What problem are you trying to solve or deal with your request to be concerned about clock cycles?<span style='color:#888888'><br><br><span class=hoenzb>- Mark</span></span><o:p></o:p></p></div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p></div></div></div></div></div><p class=MsoNormal><o:p> </o:p></p></div></div></div></body></html>