83Plus:Ports:0F

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Synopsis

Port Numbers: 0Fh

Function: This port contains the high two bits of addresses for memory mapped in port 7. Port 0E is an identical port that works with port 6.

See port 0E for comments.

Read Values

  • Bits 0-1: Whatever was last written
  • Bits 2-7: always 0

Write Values

  • Bits 0-1: Set a new value
  • Bit 2-7: No effect
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