ALTEX <AII> SETS ACQUISITION OF COMPUTER FIRMS Altex Industries Inc said it has agreed in principle to buy 82 pct of two privately-held affiliated computer retail companies for an undisclosed amount. Altex said the Denver-based companies had revenues of over seven mln dlrs last year. They are Integrated Management Data Systems Inc, which sells accounting software systems to the oil and gas industry, and Integrated Management Systems Micro Distribution Division Inc, which distributes micro-computer products. Altex said it expects to close the transaction, which is subject to financing, in July.