Re: Strange 8255 behavior

From: Jeff Laughton <laughton_at_cyg.net>
Date: Sat, 09 Jun 2018 20:55:42 -0400
Message-ID: <20180609205542.Horde.CwkzIk3fLeenwEpwnpEEN73@www2.cyg.net>
> handshaking omitted for clarity

Hi, Michal.  Speaking for myself, I'd feel more clarity if the details  
were spelled out.  At least explain, please, which handshake pins  
attach to which (or link to a schematic).


> The only explanation I can think of is that when the Control  
> register of the 8255 is written, _something_ happens [...]

That makes sense to me, but I'd be looking for the "something" on the  
handshake lines (not the data pins of the port).  Or maybe I've  
misunderstood something -- always possible.

cheers
Jeff
Received on 2018-06-10 04:00:04

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