I was looking at some disassembled 4004 code when I came across a SKIP operation.
It isn't normally an instruction but If you do a JCN with all the CCCC = 0, it will do a NEVER jump. This is the equivalent of a SKIP instruction. I would suppose a JCN with CCCC = $8000 would be an always jump, on page ( not real useful as JUN takes the same cycles and space ). I thought at first there was some errors in the code because there were JMS to the middle of JCN instruction but then I noticed that there were no conditions specified for the JCN. A little thought and I realized it was a way to skip over a single byte instruction. Dwight
