Caple C871i Manual do Utilizador descarregar pdf (Página 97)

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Apple II Computer Info

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From: [email protected] (David Wilson)

Newsgroups: comp.sys.apple2

Subject: Re: Bi-color red/green LEDs: Disk II read/write????

Date: 17 Mar 98 23:17:47 GMT

Organization: University of Wollongong, NSW, Australia.

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References: <[email protected]>

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[email protected] (stephen e buggie) writes:

>A store is clearing out bi-color LEDs red/green. These LEDs have three

>wires: black (negative), red (red +), green (green +).

>I want to add the bi-color LED to my Disk II drives, so that it will glow

>GREEN for READ, and RED for WRITE. I already have an AE 3.5" 800K drive

>that does this, and it looks nice. This will be a third enhancement to

>Disk II --- "Super Bugg-Drive."

>First, what value of resistor should be added? The ad says these are 2

>volt LEDs, and that 20 milliamps should flow through the LED.

>Will the 20 milliamps affect the read/write performance of the drive in

>any way?

>Not sure where in the analog board to connect the LEDs. Could I attach

>the black lead to a ground point, then touch various analog card points

>while the disk is reading vs. writing?

>Will other components be needed besides the bi-color LED and its padding

>resistors?

>Would it be simpler to just reconnect the red LED to a point on the analog

>board, and then to install a second separate LED to denote WRITE?

>Stephen Bugge [email protected]

I have been looking through my copy of Apple's DOS manual with the circuit

diagram of the Disk ][ analog card and Jim Sather's Inside the Apple II and

think it can be done.

Apple II Computer Technical Information : Apple II Family Hardware Info

ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 97 of 572

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Caple C871i Manual do Utilizador Página 97

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