DFC-150 DFC-200AS and DFC250AS AP Diff

[X-TH]

Hello,
Just wonder about the differences between the old DFC-150, DFC-200AS and DFC250AS AP control heads. From outside they look almost the same, but I'm
sure is not the case when about features and functionality and about the servos used with the respective AP.
Can anyone make light on this subject ?

So far I know is that DFC-200/200AS is a full feature autopilot with Control
Wheel Roll Steering and Pitch Control, GPS Steering
(GPSS), Vertical Speed Command, Altitude Hold,
and Trim Sensing.

DFC-250/250AS adds an internal Digital Altimeter with
Altitude Preselect and Airspeed select, to the standard
DFC-200 system

How about DFC-150 ? - are manuals available any more ? for 200 and 250 the manuals and instalations manuals are the same.

Many thanks

[TrutrakTech]

There is no manual available for the DFC150 as we made only one or two of them. The 150 is a single axis AP, roll only. It has no pitch control at all. It will couple to a VOR and the localizer.