Originally Posted by
AerocatS2A
Here is someone who has no experience with an autopilot other than the one on the A320! No offence intended, StudentInDebt, but the A320 autopilot panel is quite unusual in not having an ALT button. The ALT button is similar but not identical to pushing the VS knob on the A320. ALT hold captures an altitude rather than just targeting a VS of 0.
Do you know I wondered for 10 years what that HOLD button beneath the Altitude window did on the 757/767 MCP, thanks for clearing that up for me.
As I say, having realised I was missing something, I looked up the answer online myself which then complemented the explanation t_cas gave, and indeed your own once you got the condescension out of the way.