No auto throttles. No auto spoilers. No auto brakes. No altitude capture. Capture altitude with the pitch/roll knob and engage ALT HOLD switch.
PDCS? Computer drove EPR bugs. Gave altitude/thrust data. Kinda dumb. If you flew a heavy flight after a light flight the EPR bugs would read too low for a while in cruise until it eventually figured out "hey, I need more power." If you flew a light flight after a heavy flight the EPR bugs would read to high ( thinking the plane was still to heavy). So you could either scream around the sky at high Mach or set a lower EPR and wait for the PDCS(?) to finally catch up in cruise. It would the awhile. Ten to 20 minutes???
K-factor (drag index) could be checked on the status page. 1.00 normal, light a/c could read as low as .95 on arrival, heavy a/c could have K-factors(drag index) as high as 1.05(+/-). Double check on preflight would give you a clue if you could trust PDCS(???) EPR settings for cruise. Low K factor and heavy flight = set higher EPR's for initial cruise power. High K factor and light flight = set lower than commanded EPR settings.
Memory says K-factor was on page 4/4(?) of status (data?) page. Bleed valves were zeroes and ones on another data/status page. They'd change as you cycled the engine bleeds.