Redwood City, CA Ð NeXT in July began shipping standard black-and-white 25MHz NeXTstations with the more powerful chip set used in Turbo stations, improving performance. The 68040 CPU, however, remains at 25MHz.
NeXT made the change to increase manufacturing efficiency in 25MHz machines, starting with serial number ABB0028000. The new chip set increases performance by providing a more sophisticated memory-management subsystem and better peripheral controller.
The enhanced systems use the same type of memory as all other NeXTstations (72-pin, 70-nanosecond SIMMs, single- or double-sided).
In another change, the new Turbo Color machines equipped with ADB (Apple Desktop Bus) support have a monitor with a slightly higher scan rate Ð 72Hz versus 68Hz Ð that is easier on the eyes.