\pard\tx520\tx1060\tx1600\tx2120\tx2660\tx3200\tx3720\tx4260\tx4800\tx5320\fc0 Q: Are the DSP56001 bit operations (set, clear, test, change) fully implemented in the NeXT DSP?\
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Q: Which revision of the Motorola DSP56001 does NeXT ship with its machines? The latest C revision fixes some problems.\
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A: In earlier versions of the 56001, bit-oriented instructions (set, clear, test, and change) worked only in memory, not in ALU registers. This problem was fixed in the Revision C release of the Motorola DSP56001, which NeXT currently uses in its computers. \
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To tell whether you have the C revision or the earlier B version, examine the code printed on the DSP chip. The B chips have "B77G" preceding the date code, while the C chips have "C68S" or "C21T." For example:\