Version 3.0 of Apple Computer Inc’s A/UX Unix implementation reportedly does not run using System 7.1, and cannot, therefore, be used on a 7.1-dependent Macintosh – the very machines with enough power to run A/UX at a reasonable rate. An upgrade, 3.0.1, which would run under 7.1, has been promised for some time. But Apple apparently underestimated the problem of making the 7.1 A/UX Finder facility compliant and developing A/UX 4.0 (PowerOpen) at the same time. Observers believe Apple has concentrated most of the development resources available on A/UX 4.0 because it wants to release PowerOpen with its PowerPC Macs. Furthermore, it seems conversion of A/UX 3.0 to Finder 7.1 has ceased. It was believed to be a short term fix in any case.