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 Post subject: 74LS161 Binary Counter questionPosted: Mon Sep 09, 2013 3:05 am

Joined: Mon Sep 09, 2013 2:50 am
Posts: 2
Hello there. First I ll introduce myself as this is my forst post. My name is Ryan and I have been using this board as reference for a long time. I just stated modding carts and making carts just recently and have found this board and the Nesdev wiki VERY VERY useful. So a BIG "Thanks" to everyone who has posted, Im sure Ive used your info.

My quesrtion today is about the Binary Counter 74LS161. IM trying to understand how the counter workds exactly. I stumbled up callan brown's tutorial on making a 4 in 1 multi cart and found that interesting. But I want to take it a step further and make a 8 in 1 or even a 16 in 1. But I am not sure exactly how the counter works and dont know how I would break it up into 8 banks or 16 banks.

Can someone help me undertsand how to do this please? I truely appreciate any help.

Ryan

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 Post subject: Re: 74LS161 Binary Counter questionPosted: Mon Sep 09, 2013 9:52 am

Joined: Sun Apr 13, 2008 11:12 am
Posts: 7648
Location: Seattle
Rather than trying to anticipate exactly what your question is, have you read the datasheet?

for example, http://www.futurlec.com/74LS/74LS161.shtml

What would you like clarified?

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 Post subject: Re: 74LS161 Binary Counter questionPosted: Mon Sep 09, 2013 10:50 am

Joined: Wed Aug 21, 2013 5:00 pm
Posts: 19
Check out this link. In this tutorial he explains how to assemble a 4 in 1 multi cart. And references also being able to make use of 8 banks and 16 banks. That's what I need clarifying is exactly how the use 3 bits of the counter for 8 banks and 4 bits of the counter for 16 banks.

http://callanbrown.com/index.php/super- ... -multicart

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 Post subject: Re: 74LS161 Binary Counter questionPosted: Mon Sep 09, 2013 11:03 am

Joined: Sun Apr 13, 2008 11:12 am
Posts: 7648
Location: Seattle
Do you understand bitwise logic and binary? Connecting only the bottom two bits is equivalent to ANDing with 3 (because 3=2+1)

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