True ... that one is a very old one which (I think) comes from IBM (or startrek) originally and wasn't especially texttospeech but a direct recording.
I remember "initiating start up sequence" and also a shutdown. 
There prolly is more but will be harder to find.
Did you check out these?
https://www.audiosparx.com/sa/display/sounds.cfm/soundGroup_iid.202
