Texas Instruments Inc has added the 33MHz 68040-based 1508 to its 1500 family of Unix systems, priced at $1,988 per TPS: a single processor supports 64 users; an optional second processor goes to 128 active users, twice what the line could previously handle; availability is this month with list prices beginning at $18,000; Texas is in process of selling its Unix systems business to Hewlett-Packard Co.