Block Transfer and Compare

Compares (via subtraction) the value in a with the 8-bit value pointed to by hl. Then, both hl and bc are decremented by one.

• Opcode: 11101101 10101001
• Bytes: 2
• Flags:
  • S: Affected as defined
  • Z: Set if the value in a is equal to the 8-bit value pointed to by hl, reset otherwise
  • H: Affected as defined
  • P/V: Set while bc is not 0, otherwise reset if bc is decremented to 0
  • N: Set
• Cycles: 2F + 1R

Compares (via subtraction) the value in a with the 8-bit value pointed to by hl. Then, both hl and bc are decremented by one. This operation is then repeated until either a is equal to the 8-bit value pointed to by hl, or the P/V flag is reset (bc is decremented to 0).

• Opcode: 11101101 10111001
• Bytes: 2
• Flags:
  • S: Affected as defined
  • Z: Set if the value in a is equal to the 8-bit value pointed to by hl, reset otherwise
  • H: Affected as defined
  • P/V: Set while bc is not 0, otherwise reset if bc is decremented to 0
  • N: Set
• Cycles: 2F + (1R + 2 ) * bc - 1

Compares (via subtraction) the value in a with the 8-bit value pointed to by hl. Then, hl is incremented and bc is decremented by one.

• Opcode: 11101101 10100001
• Bytes: 2
• Flags:
  • S: Affected as defined
  • Z: Set if the value in a is equal to the 8-bit value pointed to by hl, reset otherwise
  • H: Affected as defined
  • P/V: Set while bc is not 0, otherwise reset if bc is decremented to 0
  • N: Set
• Cycles: 2F + 1R

Compares (via subtraction) the value in a with the 8-bit value pointed to by hl. Then, hl is incremented and bc is decremented by one. This operation is then repeated until either a is equal to the 8-bit value pointed to by hl, or the P/V flag is reset (bc is decremented to 0).

• Opcode: 11101101 10110001
• Bytes: 2
• Flags:
  • S: Affected as defined
  • Z: Set if the value in a is equal to the 8-bit value pointed to by hl, reset otherwise
  • H: Affected as defined
  • P/V: Set while bc is not 0, otherwise reset if bc is decremented to 0
  • N: Set
• Cycles: 2F + (1R + 2 ) * bc - 1

Transfers the byte of memory pointed to by hl to the memory location pointed to by de. Then hl, de, and bc are decremented.

• Opcode: 11101101 10101000
• Bytes: 2
• Flags:
  • H: Reset
  • P/V: Reset if bc becomes zero
  • N: Reset
• Cycles: 2F + 1R + 1W + 1

Transfers the byte of memory pointed to by hl to the memory location pointed to by de. Then hl, de, and bc are decremented. If bc is not zero, this operation is repeated. Interrupts can trigger between repetitions.

• Opcode: 11101101 10111000
• Bytes: 2
• Flags:
  • H: Reset
  • P/V: Reset
  • N: Reset
• Cycles: 2F + (1R + 1W + 1) * bc

Transfers the byte of memory pointed to by hl to the memory location pointed to by de. Then hl and de are incremented and bc is decremented.

• Opcode: 11101101 10100000
• Bytes: 2
• Flags:
  • H: Reset
  • P/V: Reset if bc becomes zero
  • N: Reset
• Cycles: 2F+1R+1W+1

Transfers the byte of memory pointed to by hl to the memory location pointed to by de. Then hl and de are incremented and bc is decremented. If bc is not zero, this operation is repeated. Interrupts can trigger between repetitions.

• Opcode: 11101101 10110000
• Bytes: 2
• Flags:
  • H: Reset
  • P/V: Reset
  • N: Reset
• Cycles: 2F + (1R + 1W + 1) * bc