ICW2 (Initialisation Command Word Two)

ICW3 (Initialisation Command Word Three)

• 
  Master mode: 1 indicates slave is present on that interrupt, 0 indicates direct interrupt
  
• 
  Slave mode: ID3-ID2-ID1 is the slave ID number. Slave 4 on IR4 has ICW3=04h (0000 0100)
  

ICW4 (Initialisation Command Word Four)

A0 1	D7 D6 D5 D4 D3 D2 D1 D0 0 0 0 SFNM BUF M/S AEOI Mode

• 
  SFNM: 1=Special Fully Nested Mode, 0=FNM
  
• 
  M/S: 1=Master, 0=Slave
  
• 
  AEOI: 1=Auto End of Interrupt, 0=Normal
  
• 
  Mode: 0=8085, 1=8086
  

OCW1 (Operational Command Word One)

A0 1	D7 D6 D5 D4 D3 D2 D1 D0 M7 M6 M5 M4 M3 M2 M1 M0

IRn is masked by setting Mn to 1; mask cleared by setting Mn to 0 (n=0..7)

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