I have no opinions on your situation, but you can tune a haltech without a laptop. Just no 'on the fly' tuning. You will need a long serial cable to reach the Haltech if you don't have a laptop. In short, the only way to modify maps is with a computer. Buy a $40 laptop, you don't need anything special.
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Jay
The Ricemobile
94 Base w/ never enough mods
87 Base w/ never enough miles