NobodyIsHere
Veteran Member
- Joined
- Dec 21, 2006
- Messages
- 2,410
Hi! Is there anyone with experience with interfacing 6821 to 8255 that can help me with an N8VEM project? I am building a 6809 host processor for the N8VEM system. The 6809 uses the 6821 to communicate directly with a 8255 which is a peripheral on the N8VEM SBC via the ECB backplane.
Basically the 6821 and 8255 form a parallel bridge. I'd like to use the automatic handshaking features of the 6821 and 8255 if possible. However, my prototyping has only had mixed success so far.
I could really use a hand for someone to look over this design and see what I am doing wrong, etc.
Thanks and have a nice day!
Andrew Lynch
Basically the 6821 and 8255 form a parallel bridge. I'd like to use the automatic handshaking features of the 6821 and 8255 if possible. However, my prototyping has only had mixed success so far.
I could really use a hand for someone to look over this design and see what I am doing wrong, etc.
Thanks and have a nice day!
Andrew Lynch