Match List I with List II.
| List I | List II |
|---|---|
| (A) Handshaking | (I) I/O interface informs the CPU that device is ready for transfer |
| (B) Programmed I/O | (II) Requires two control signals working in opposite directions |
| (C) Interrupt-initiated I/O | (III) Has local memory and controls large set of I/O devices |
| (D) I/O processor | (IV) Requires CPU to check the I/O flag and perform transfer |
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