Re: petSD project page

From: Nils Eilers <*nils.eilers_at_gmx.de*> Date: Tue, 14 Jun 2011 12:51:16 +0200 Message-Id: <5BB66D7F-BF74-4684-B26C-8B7090CF6403@gmx.de> · nils.eilers_at_gmx.de

> I ran into the same problem with my CBM-HD project. I have two 
> soultions:

I like the idea how an ATN trap can get implemented by using a single 7406.
However, an AVR doesn't have OC outputs, but we could use the forth of six gates like this:

                              +5V
                               |
                               |  
                              | | 10k
                              | | 
                |\            |_|         |\
                | \            |          | \
       ATN -----|  O-----------+----------|  O----- NRFD
                | /            |          | /
                |/ 1/6 7406    |          |/ 1/6 7406
                               |
                               |
                |\             |          |\
___________     | \            |          | \
TRAP ENABLE ----|  O-----------+----------|  O----- NDAC
                | /                       | /
                |/ 1/6 7406               |/ 1/6 7406

(must use a fixed width font like Courier New to properly display this)
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