eater: PC inc included, decode on negedgemain

Some cycles can be saved.
As previously (wrongly) committed, the PC can be incremented early,
but the decoder needs to do this "early", so as now implemented,
on the falling clock adge already.

1 files changed, 3 insertions, 0 deletions

diff --git a/eater_cpu/readme.txt b/eater_cpu/readme.txt
index e4b28cd..44ae2d2 100644
--- a/eater_cpu/readme.txt
+++ b/eater_cpu/readme.txt
@@ -54,6 +54,9 @@ operation
    Yes, I know Ben Eaters computer combines b and c.
    See eater_types for details.
 
+   Actually, it occurred to me you can combine b and c,
+   if you like BE PC, run the decoder on the falling clock edge.
+
 2. Decode and execute instruction.
 
 2.I LDA: Load memory into A