68k:Ports:60000D
From WikiTI
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: (?)
