WORD
Hardware error in add-on cassette type 1
The data register stores the number of the add-on cassette in which a hardware error occurred. Type 1 of the add-on cassettes includes AFPX-COM*, AFPX-IN8, AFPX-TR8, AFPX-TR6P, AFPX-IN4T3, AFPX-AD2, AFPX-TC2. Bit 0 and 1 correspond to cassette numbers 1 and 2. (No. 1 is closest to the CPU.)