Vivid Profits For A Video Whiz

Tseng Labs, a small manufacturer of chips that enhance video graphics in personal computers, is fast gaining the respect of major computer makers--and investors. Its stock, which traded as low as 3 late last year, hit a high of 10 in April before easing back to 8 1/4 recently. After that meteoric rise, even the company's most loyal fans are wondering if the stock has reached its peak.

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