In SX Microcontrollers, SX/B Compiler and SX-Key Tool, tdg8934 wrote:

I have asked for help on this forum and received little.

I am sending Metron9 a couple of 8255's this weekend that he can look at with his BS2 and SX-28 chips to replicate what I am seeing. He has a scope so he can see some timing differences. I can't believe that this is this difficult to figure out. I am lost for ideas. I did receive an old 1977 book today in the mail from Ebay called "Microcomputer Interfacing with the 8255 PPI chip" but it looks really out dated. Hopefully I can get some insight on this chip.

Although, I think the 8255 chip is ok but the SX-28 has timing issues with this chip. 

Comments? Although I feel sometimes like no one is home.

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