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> SUB r Subtract without Carry Rabbit 4000 Instruction

> Opcode | Instruction | Clocks | Operation
> ---- | SUB r | 4(2,2) | A = A - r
> 7F 97 | SUB A | 4(2,2) | A = A - A
> 7F 90 | SUB B | 4(2,2) | A = A - B
> 7F 91 | SUB C | 4(2,2) | A = A - C
> 7F 92 | SUB D | 4(2,2) | A = A - D
> 7F 93 | SUB E | 4(2,2) | A = A - E
> 7F 94 | SUB H | 4(2,2) | A = A - H
> 7F 95 | SUB L | 4(2,2) | A = A - L

> Flags | ALTD | IOI/IOE
> S | Z | L/V | C | F | R | SP | S | D
> · | · | V | · | · | · |  |  |

> #### Description

> Subtracts r (any of the registers A, B, C, D, E, H, or L) from A. The result is stored in A. The Rabbit 4000 assembler views "SUB A,r" and "SUB r" as equivalent instructions.

> The opcodes for these instructions are different than the same instructions in the Rabbit 2000, 3000 and 3000A.

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