68k:Ports:60000D

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Link status (interrupt reason)

According to J89hw.txt you have to read 60000C to begin acknowledging a link interrupt. Other documents don't seem to mention this though.

  • Bit 7: Error (write 0xE0 then 0x8D to 60000C to acknowledge)
  • Bit 6: Transmit buffer empty (write another byte or clear 60000C:1 to acknowledge)
  • Bit 5: Received byte (read the byte to acknowledge)
  • Bit 4: Interrupt pending (Always 1 in interrupt handler)
  • Bit 3: Autostart
  • Bit 2: (?) External activity
  • Bit 1: (?)
  • Bit 0: (?)