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Author Topic: A1200 8520  (Read 3016 times)

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Offline orangeTopic starter

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A1200 8520
« on: July 28, 2004, 02:15:22 PM »
Someone, please tell me which one of A1200s CIA chips is ODD?

I've been searching the google for hours and found only adverts  
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Offline orangeTopic starter

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Re: A1200 8520
« Reply #1 on: July 28, 2004, 02:29:24 PM »
Is that (U7) the one near keyboard connector or the one near floppy?
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Offline orangeTopic starter

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Re: A1200 8520
« Reply #2 on: July 28, 2004, 06:12:03 PM »
I'm not sure. Thanks for the info.

Can parallel be tested without connecting anything to it?

I'm suspecting Alice for freezing, too. It gets pretty hot few moments after powerup (43Celsius or 108F).
Any way to test it?
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Offline orangeTopic starter

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Re: A1200 8520
« Reply #3 on: July 29, 2004, 07:56:32 AM »
OK.
I forgot, how do you count pins on chip, clockwise or anticlockwise?
The one with circle is number one, right?
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Offline orangeTopic starter

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Re: A1200 8520
« Reply #4 on: July 29, 2004, 04:23:17 PM »
yes, it is. The pin just seems unused, everything "works" as before without it.

I'd like to check voltages of IDE and Alice.
It should be pin 52 for +5V and pin 58 for GND on Alice, right?

41 and 42= +5V, 43=GND for IDE.
BTW, which pin is 1 on IDE connector? There is number 1 printed on PCB, but I suspect its 44 actually?


Can I check Alice voltages with digital multimeter (can it break something?)
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