I/O Trap Cause

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Number $DA
Readable Yes
Writable No
Short Description experimental 
  0 = none (zero at the same time nextreg 0x02 bit 4 is 0)
  1 = port_2ffd read
  2 = port_3ffd read
  3 = port_3ffd write
  • If nextreg 0x02 bit 4 indicates an i/o cycle was trapped, this register indicates the cause
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