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

Peter,

I stated earlier that I am able to swap many different 8255's from various manufacturers (I have 13 of them) and they pretty much work on the 8255 circuit for the 4-5 of them I have tried but do not on the SX-28 circuit. 

Thanks for checking. 

 

PS: How do I tell if I have the CMOS version? I may not have this if it is listed as 82C55A. C is for CMOS? God I hope I don't have to buy more of them. Lol. I have the standard ones I think from Intel, NEC (e.g. 8255A) but I will look again. I am going out of town on business and won't be able to check on this till Friday but I will let you know although I don't believe I have an CMOS version. Static Sensitive. Yikes.

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