Aha! That seems to be it! If I do a reset, set PSW to 340 and then g 14000 the program has stayed running the couple of times I have tested it. I looked at vector 100 and it has 5267. I cleared PSW and jumped to 14000 and when it aborted I got 5271 so it isn't the LTC. I'll have to look through that lower part of memory and see where I find that value.
Thanks guys for all the help! I learned a lot from all this info. - Peter On Thu, Oct 30, 2025 at 9:08 PM Jon Elson via cctalk <[email protected]> wrote: > On 10/30/25 18:29, Peter Ekstrom via cctalk wrote: > > Martin, > > > > Thank you for the additional insight. The diagnostics is an interesting > > thought. I will run that tomorrow in SIMH and see what happens. > > Given that I can run things like RSX11M and XXDP in it, on the 11/23 CPU > I > > would expect it to work fine. > > > > I am fully expecting that I am doing something wrong given that I'm just > > beginning to learn Macro11. > > It is NOT your Macro11, It has to be an interrupt. Nothing > else could break that loop of instructions. Scan low memory > for a location that has 5266 in it. Some interrupt is > causing the machine to jump to a vector that points to > 5266. Glen suggests the line time clock vector. The KW11-L > LTC vector is at 100.(8). > > Jon > >
