Caple C871i Manual do Utilizador descarregar pdf (Página 101)

100

101

Apple II Computer Info

PH 0-3 stepper motor phases 11-14 11-14 11-14 2,4,6,8

WREQ write request 15 15 15 10

DRVEN drive enable 17 (9) 17 17 (9) 14

RDDATA read data 18 18 18 16

WRDATA write data 19 19 19 18

EXTINT external interrupt - 9 - -

3.5DISK Apple 3.5 drive enable - - 4 -

HDSEL 3.5" drive head select - - 16 -

not connected - 16 - -

As you can plainly see, pin 5 supplies the -12V used by the Disk ][ drive.

No pin 5 => no -12V => no function. Have a look at the circuit diagram of

the Disk ][ (in the DOS manual) to see what the -12V is used for.

Pin 9 is the second drive select and is not needed unless you intend to

daisy chain drives.

David Wilson School of IT & CS, Uni of Wollongong, Australia [email protected]

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Apple II Computer Technical Information : Apple II Family Hardware Info

ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 101 of 572

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Caple C871i Manual do Utilizador Página 101

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