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Hardware error in add-on cassette type 2
The data register stores the number of the add-on cassette in which a hardware error occurred. Type 2 of the add-on cassettes includes AFPX-PLS, AFPX-MRTC, AFPX-DA2, AFPX-A21. Bit 0 and 1 correspond to cassette numbers 1 and 2. (No. 1 is closest to the CPU.)