Friday, August 26, 2011

Layout

I'm going to describe how my layout is going to work. If you've read my previous entries you'll notice I'm using two breadboard style perfboards. For me this makes wiring easier but there are problems with using them:
1. You need two because one that would be long enough for all the ICs would be ridiculous.
2. It's easier to keep all ICs using the data bus and address bus on the same board. Luckily the only thing that uses the address bus is the ram.
3. There isn't an effective way to put the hex displays on the board directly.

For issue two I put the 1802, the ram, and IC 8 and 9 on the same board. Now any of you who know the schematics well are thinking, "What about IC 4 and 5?" well.... I ran out of room. My first idea was to have them on a separate board with just the hex displays that could be mounted directly to a case but that doesn't work because they are also used in the control logic. So I'm going to have to channel the data bus over to the other board anyway.

I'm making the case out of wood in which I'll mount both boards with long sides touching. The switches and hex displays will be mounted directly to the case.

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