Caple C871i Manual de usuario descargar pdf (Pagina 91)

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Apple II Computer Info

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From: Rubywand <[email protected]>

Newsgroups: comp.sys.apple2

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

Date: Wed, 13 May 1998 17:53:55 -0500

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There was a recent opportunity to do the two-color LED mod to some

Disk II drives-- i.e. A bi-color LED is swapped in for the old red "in

Use" LED. It shows Green for Reads and Red for Writes.

Additional testing during the recent work led to an improved

circuit and the discovery of an error in my description of the earlier

circuit.

First the correction. My earlier post says ...

.....

> pin 11 goes to + end of mini 10uF capacitor

> pin 12 goes to - end of the mini 10uF capacitor; and

> pin 12 goes to a 22000 Ohm resistor

.....

There is no connection to pin 12 of the 74121. The above should have

read ...

> pin 10 goes to + end of mini 10uF capacitor

> pin 11 goes to - end of the mini 10uF capacitor; and

> pin 11 goes to a 22000 Ohm resistor

The original circuit works fairly well (if you figure out that the

directions contain an error); but, breadboard tests indicate that the

74121 can not adequately source many LEDs which might be employed.

Apple II Computer Technical Information : Apple II Family Hardware Info

ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 91 of 572

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Caple C871i Manual de usuario Pagina 91

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Caple C871i Manual de usuario Pagina 91

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