George, you CAN easily replace the old computer. The problem is, as Bogart said in Casablanca, you've been misinformed.
"The wires left are 1.wifi antenna -a little coax.. 2. VGA connecter. 3. 12volt spade plus and minus spade connectors . 4.AIS connector."
1. Wifi antennas
are quite uncommon. If it is an antenna, it will work with a limited number of Wifi cards or adapters. This is the same difference as that between a TV antenna
and a TV set
. So, you need to start peeking and poking and find out exactly what you've got, by brand name and model. If you can't find that, you'll need to post pictures, good clear close pictures, to get some help.
The odds are that any electronics
five years old can be better replaced by something newer which does a better job than fixing up the old stuff would.
2. VGA connecter
Unlikely, all that would do is allow you to plug in a VGA monitor. Do you need a second monitor for anything? Did he have one?
A standard "VGA" cord was usually a DB-15 high density
cord, it was never specific to VGA monitors. It simply has 3 rows of 5 pins each and was used for many things. If you don't know what it connected to, forget it and move on.
3. 12volt spade plus and minus spade connectors .
That sounds like it has nothing to do with the computer. Unless his old computer ran directly from a 12 volt power connection (possible) that was a power supply for something else, possibly the WiFi adapter or AIS. What are you trying to power? If you don't know, again, forget about it and move on.
You may only have an AIS antenna, which is essentially a duplicate VHF
antenna. Again, you need to find out what you have. If there is an AIS receiver or transponder, you need to find out what it is and how it connects to a computer. What software it needs to run, what interface cable it uses.
If this is all too technical for you, then you need to hire a Sparky to set it all up for you. With computer electronics
, the details are all critical, and you can't just make assumptions from pieces.