I/O Traps Register

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Revision as of 12:45, 14 October 2025 by Xalior (talk | contribs) (Xalior moved page I/O Traps to I/O Traps Register: match formal nextreg.txt name)
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Number TBRegisterNumber::$D8
Readable TBRegisterReadable::Yes
Writable TBRegisterWritable::Yes
Short Description ShortDesc::experimental 
  bits 7:1 = Reserved must be zero
  bit 0 = 1 to enable +3 FDC traps on ports 0x2ffd and 0x3ffd
  • An i/o trap generates a multiface nmi and is indicated in nextreg 0x02
  • Traps cannot be triggered by the dma or while the multiface, divmmc or external nmi is active
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