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README.md
rc2014_6809.brd
rc2014_6809.sch
rc2014_6809_brd.pdf
rc2014_6809_sch.pdf

README.md

6809 CPU Board for the RC2014

These are the EAGLE files for the RC2014 6809 CPU Board.

The A15 line selects the inverted A15 signal from the 6809. This allows you to use the standard RC2014 memory and I/O boards by inverting the 2 halves of the memory space: ROM sits at top of memory and RAM at the bottom of memory.

The I/O space is decoded by the 74HCT688 and is mapped as a 256-byte block to the start of 0C000H. You will map the Z80 I/O addresses to the 6809 I/O space by adding 0C000H.

Compatibility:
TBD

You can have boards made at OSH Park at the following link:

Order from OSH Park

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