Pop the fuse panel off (it's on the driver's side; you'll have to open the door to see it. It's were the dash and the door come together.) and check all of the fuses. If I remember right there is also a fuse panel in the glove box. It's been a while since I had my '95 S-10. Best way to find all of the fuses is the owners manual, so look through there. Chances are you popped the ECU fuse, so I would start there. When jumping, connect the negative to the body or the core support.
A good place to go for s-series related topics/problems/ ect. is at s-seriesforum.
http://www.s-seriesforum.com/forum/index.php
Of all the s-series websites I was a member on I liked this place the best. Still frequent the site to read the off-topic and what GM is up to.... and the Sonoma GT 0334 project.... twin turbo 4.3 V6, custom everything. Tube chassis in the rear, custom dash, firewall, wheel wells, bed, you name it. Not one piece on that truck is factory. :jerk: