stec-55x problem

[diamonddriller]

I have just upgraded to a Mac Studio, and run XP12 natively on the M processor (i.e. not Rosetta).

I can't remember whether the stec-55x is supposed to have altitude preselect working on the Entegras - because my last Intel iMac couldn't run these planes without flashing screens, so I hardly used them, and stuck with the G1000s.

Anyway, today, I found that altitude preselect (what I fed in on the Entegra PFD) was totally ignored by the autopilot.  In fact, even the VS speeds were not kept to very accurately.  Is this possibly a problem with the M processor?  I had, earlier, tried the same plane in X-Plane 11 running in Rosetta, and the autopilot verged on being almost unusable for altitude control, and I gave up.  

I, so far, have had very limited experience in X-Plane using Mac Silicon, so I don't know what works, and what doesn't!  I get super fps, which is a big plus.

[Cameron]

The aircraft function is the same regardless of platform. Altitude pre-select should be followed so long as a vertical mode is active. This will ARM the pre-selected altitude.

For VS, are you saying it will not obey a commanded higher pitch, or are you trying to use an IAS mode?