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

I do appologize and yes it is fustrating. 

I just don't understand why it works on a BS2 but get nothing on a SX-28. 

I am having an expert in the ZX81 community Wilf Wrighter help me with this on a ZX81 forum as he is one of the pioneering people that has many years experience with the 8255. He has been a great help for me to try things in the code. However, it seems to be apparent the issue is with the SX-28. You're right about needing a scope and Metron9 has been gracious enough to help me troubleshoot this. 

I have not gotten much sleep working on this at night and I appologize if I have affended anyone. 

Thanks for the good advice Bean.

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