Chris Needham

Can you share the disk image you use? We could try testing it against the fix that @monkeyman79 has added: https://github.com/stardot/beebem-windows/pull/91

Thank you! I think it's not working. In the ROM configuration, I set banks 0 to 10 to RAM, then boot the disk, press Ctrl+Break, then *ADE. At that point...

> I attach the Sprow ARM7TDMI 2nd processor and reset the emulator. Speed remains at about 1.00, but fps now between 0 to 12 and fluctuating between the two and...

Thanks! My laptop is Intel i7-10510 CPU at 1.8GHz, so not dissimilar performance to yours, so I'm surprised we get such different results. The speed adjustment is a part of...

The menu commands are handled [here](https://github.com/stardot/beebem-windows/blob/037ae3add31fa30cf11322752fcb154cb75faa5b/Src/beebwin.cpp#L2137). If you select one of the Fixed speed options, then `m_FPSTarget` is set to 0 and the `m_RealTimeTarget` value is used. Conversely, the FPS...

Thanks, I'll try to reproduce it here. I don't think anything changed in recent releases to cause this problem. Help fixing this is welcome, if you're interested to look into...

Thanks Sam. I'm not aware of anyone looking at this, so any help you can give would be very welcome!

> When I take NMILock out of the equation during the 1770 poll function, the issue disappears on DDOS 3.45 (and a test program I wrote based on the datasheet)....

> Actually, before I do that, NMILock appears to be related to the 6502 not attempting to re-enter the NMI routine whilst an existing one is running (haven't got the...

I might remove the NMILock altogether in my local copy and see if anything breaks. I wonder if we need to add timing before which a second NMI won't be...