I see the bridge computer as an array of processors responsible for maneuver, navigation and security. There is also a "backbone" that links those processors, the sensors, communications, engineering, LSS, and the bridge interfaces.
To ad more "flavor" the bridge interface becomes more sophisticated at higher tech levels. The interface is generally standard on computers at the appropriate TL, no extra cost. They were first introduced on big dedicated machines, +1 TL on ship and office computers, +2 TL on personal computers, +3 TL on handheld computers. (ie, at TL 13 your Ships computer may be an AI, and you're pocket PDA would have an Artificial Personality.
Punchcards & teletype TL5
Keyboard & CRT TL6-
Verbal Interface (TL7) Just uses verbal commands and spoken responses instead of the keyboard. Think classic Star Trek. I used maritime protocals to prevent mistakes from misinterpreted orders (if it works shouting orders in a gale, it should work for a dumb machine on a quiet bridge.)
For example, "Shut down engines"
"Shut down power plant, aye"
"Belay that! Secure the MANEUVER drive."
"Secure maneuver drive, aye."
pause
"Maneuver drive is secured"
Artificial Personality (TL9) Adds social amenities, but may not always be appropriate (like the ship in Hitch Hikers Guide). Seldom used for crew functions, but often for PDA.
"Good morning, Ms Vanaprul, this is the morning of your seventh day on "The Duchess of Regina", and thank you for choosing Tukhera lines, the safest way to travel in the Spinward Marches. Breakfast is now being served in the lounge, or a continental breakfast can be sent to your room. The Captain asked me to tell you that we did not come out of jump as expected last night, and that may cause some inconvenience. Have a GREAT day."
Artificial Intelligence TL12 The computer is aware of it's environment and can draw conclusions and make appropriate choices, but, like an idiot savant, only in some areas. Like Hal 9000, "We have a problem in engineering. I know we have been using it heavily, but following the guidelines programmed at the last overhaul, I am shutting down the maneuver drive for repairs." With expert systems (and sometimes a manipulator or robot) installed it can act as a crewman in an emergency at a skill level 1/2 the expert program.
Self Aware TL 14 We are talking about a full silicon-germanium NPC here. Its feelings can be hurt (although it also has professionalism) and with social skills even. "When I was fixing the coolant leak after the Pirates chased us, I saw some suspicious tool marks on the fittings. Captain, I know the manager of Smithson's Shiprights is a friend of yours, but the pirates may have bribed one of his techs. I suggest we get our repairs done in a different yard this time." A self aware computer can take full advantage of Expert systems, and may or may not pass port clearance regulations as a crewman.
At TL16 we can have fully automated ships.
You can also buy "expert systems" that will assist a player with specialist knowledge and proceedures.
If the PC has no expertise in that field but a basic understanding of the tools and equipment (i.e. a Engineer trying to Navigate, etc), he can perform as if he had a skill of 1/2 the program level. If the character has at least one level of the appropriate skill he can use his skill or the programs skill, whichever is higher.
TL applies to engineering programs: -1 for ecery 2 TL higher, -1 for every 3 TL lower. I.e., a +2 TL10 program is +1 with a TL12 or TL13 drive, no help with a TL14+. A +2 TL14 pogram is only +1 with an old TL8-11 drive
Price varied. Ship skills were about a 100KCr/level.