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Old 08 November 2014, 15:09   #1
dirkies
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Question Where are pins 12 and 83 on a RAMSEY chip

trying to check some mainboard memory issue but have no f'ing clue where to start counting the pin numbers!

Anyone has an idea?

click on this link to see a photo with colour codes I made:

https://plus.google.com/110332344341...ts/edLiQfnd5cX


I assume
RED dot = pin 1 in the middle (actually pin 12 if you start counting from the left)
YELLOW dot = pin 12 ? (right side 12 > 32 ?)
BLUE dot = pin 54 (bottom side 33 > 54 ?)
PINK dot = pin 76 (left side 55 > 76 ?)

so top side = pins 77 > 84 (left portion) + pins 1 > 11 (right portion)

anyone can confirm this?
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Old 08 November 2014, 16:33   #2
K.C.Lee
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Count anti-clockwise starting from the dot which is pin 1.
It is the same way for DIP, PLCC etc.
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Old 08 November 2014, 17:29   #3
dirkies
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ok, so the pink dot is next to pin 11?
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Old 08 November 2014, 17:41   #4
K.C.Lee
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Yes. Pink is close to pin 11
http://www.amiga-stuff.com/hardware/pinnumbering.html
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Old 10 November 2014, 14:16   #5
dirkies
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all good, found the pins and it showed all my traces to my mobo RAM are ok
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