Date   : Wed, 10 Mar 2004 20:41:05 +0000
From   : Mike Tomlinson <mike@...>
Subject: Re: CLI then SEI

In article <404D12BC.12376.131AD93@...>, tom@...
writes
>But on a real BBC, it seems there's some kind of pipelining-like 
>behaviour going on. After a bit of playing around, I found that the 
>interrupt doesn't happen until after the instruction following the 
>CLI has run! So a CLI/SEI pair won't cause an infinite chain of 
>interrupts, though a CLI/NOP/SEI will.

So what's the effect?  The machine locks up or becomes unusably slow?
Some form of copy protection. perhaps?

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