IO Instructions
| Mnemonic | Bytes | T-States | Description |
|---|---|---|---|
| in a,(n) | 2 | 11 | Requests a value from IO port n and stores the given value in a |
| in r,(c) | 2 | 12 | Requests a value from IO port c and stores the given value in r |
| ini | 2 | 16 | Requests a value from IO port (c), stores the given value in (hl), decrements b and increments hl |
| inir | (21*(b-1))+16 | 16 | Requests a value from IO port (c), stores the given value in (hl), decrements b and increments hl. This is repeated until b = 0. |
| ind | 2 | 16 | Requests a value from IO port (c), stores the given value in (hl), decrements b and decrements hl |
| indr | (21*(b-1))+16 | 16 | Requests a value from IO port (c), stores the given value in (hl), decrements b and decrements hl. This is repeated until b = 0. |
| out (n),a | 2 | 11 | Puts the value of a out of IO port n |
| out (c),r | 2 | 12 | Puts the value in r out of IO port (c) |
| outi oti |
2 | 16 | Puts the value in (hl) out of IO port (c), decrements b and increments
hl Note: Assembly Studio and some versions of TASM tables use oti. The Zilog z80 specification and data sheets use outi. |
| otir | 2 | (21*(b-1))+16 | Puts the value in (hl) out of IO port (c), decrements b and increments hl. This is repeated until b = 0. |
| outd otd |
2 | 16 | Puts the value in (hl) out of IO port (c), decrements b and decrements
hl Note: Assembly Studio and some versions of TASM tables use otd. The Zilog z80 specification and data sheets use outd. |
| otdr | 2 | (21*(b-1))+16 | Puts the value in (hl) out of IO port (c), decrements b and decrements hl. This is repeated until b = 0. |
Block Transfer Instructions
| Mnemonic | Bytes | T-States | Description |
|---|---|---|---|
| ldi | 2 | 16 | Copies the value in (hl) to (de), increments de, increments hl and decrements bc |
| ldir | 2 | (21*(bc-1))+16 | Copies the value in (hl) to (de), increments de, increments hl and decrements bc. This is repeated until bc = 0. |
| ldd | 2 | 16 | Copies the value in (hl) to (de), decrements de, decrements hl and decrements bc |
| lddr | 2 | (21*(bc-1))+16 | Copies the value in (hl) to (de), decrements de, decrements hl and decrements bc. This is repeated until bc = 0. |
Block Search Instructions
| Mnemonic | Bytes | T-States | Description |
|---|---|---|---|
| cpi | 2 | 16 | Subtracts (hl) from a and stores the result nowhere, increments hl and decrements bc |
| cpir | 2 | (21*(bc-1))+16 | Subtracts (hl) from a and stores the result nowhere, increments hl and decrements bc. This is repeated until bc = 0. |
| cpd | 2 | 16 | Subtracts (hl) from a and stores the result nowhere, decrements hl and decrements bc |
| cpdr | 2 | (21*(bc-1))+16 | Subtracts (hl) from a and stores the result nowhere, decrements hl and decrements bc. This is repeated until bc = 0. |
