| 摘要 |
<p>In a computer system with a function of discriminating an FDD (13) used as an external storage device, a counter (21) for counting step pulses (SP) is used to set a flip-flop (22) in an ID response state, thereby maintaining an identification mode different from a normal read/write mode. In this identification mode, ID data is preset in a shift register (20) by an output signal (TC) from the counter (21). The shift register (20) outputs ID data in synchronism with the step pulse (SP). The ID data from the shift register (20) is transferred to an FDC (14) trough an interface signal line of the FDD (13) by a NAND gate (26) gate-controlled in accordance with an output from the flip-flop (22). The CPU (10) identifies the specification of the FDD (13) connected to the system in accordance with the ID data transferred via the FDC (14).</p> |
