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Question about chip IC 140, IC141

2008-11-05 by George

Hi guys, 

I'm still trying to figure out the boot problem. :( 

Are there any schematics available which tell you which chips go 
where on the digital board? I went through all my chips on the 
digital board today again and I believe I accidentally mixed up a 
couple of ICs. But thankfully I noticed before I powered the EII up. 

Could anyone kindly tell me which chips belong on IC140 and IC141?  
They are located on the first top row on the digital board (where 
chips 134/139/149/151 are missing.  I think I accidentally misplaced 
them and now I can't figure out which ones go where. (Those missing 
ones are what threw me off)

I have 2 chips which I believe belong on those spots. They are 
labeled SP 8428. But one says underneath DM74S174N, the other 
DM74s175N. 

Thanks in advance for your help.

George

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