Caple C871i Bedienungsanleitung PDF herunterladen (Seite 96)

100

101

Apple II Computer Info

(7) to GND

(14) to +5V

*Note: To have the Write LED remain OFF when Write Protect is ON,

connect instead to 74LS125 pin 8 (connect to R16 at point farthest from

ULN2003)

LED middle lead goes to GND

In both the One-Shot and the NOR gates circuit the IC is driving

LEDs. This is why 74xxx instead of 74LSxxx or CMOS IC's are specified.

Should you use a higher-current bi-color LED, it may be necessary to add

the driver transistors included in the original circuit.

By the way, it turns out that the WR Data signal is frequently

active (with pulses) even when a Write is not in progress. This pretty

well makes it useless as a way to monitor Writes.

Rubywand

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Apple II Computer Technical Information : Apple II Family Hardware Info

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