Caple C871i Bedienungsanleitung PDF herunterladen (Seite 72)

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101

Apple II Computer Info

The reason for qualifiers such as "looks like", etc. is that I have not

actually tried a mod like this on a IIe. Monitors are remarkably sensitive

to Color Burst. If the transistor does not do a good job of shunting the

signal, enough may get through to trigger Color-ON.

A more positve (but less easy) technique is to use a 74LS32 OR gate to

control flow of the 3.58MHz signal. The IC could be tack-soldered onto U88

via its +5 and GND pins. U88 is the 74S02 which has the gate which produces

Color Burst.

Pin 12 of the 'S02 would be bent up and connected to the output of an

'LS32 OR gate (e.g. pin 3). One of the OR gate's inputs (pin 2) would go to

Pin 12 of the 'S02 socket. The other (pin 1) would go to an annunciator

output.

Turning ON the annunciator forces the OR gate output to "1" and

eliminates Color Burst. Turning OFF the annunciator lets the OR gate output

follow the 3.58MHz signal and enables Color Burst.

Rubywand

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Apple II Computer Technical Information : Apple II Family Hardware Info

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