Re: 6502 stack register at reset

From: Segher Boessenkool <*segher_at_kernel.crashing.org*> Date: Sat, 25 Nov 2017 15:32:06 -0600 Message-ID: <20171125213206.GL10515@gate.crashing.org> · segher_at_kernel.crashing.org

On Sat, Nov 25, 2017 at 08:50:21PM +0100, didier derny wrote:
> Is there any 6502 starting with an initialized stack register at reset ?
> 
> a few month ago I was struggling with a strange bug...
> 
> the program was crashing or working randomly
> 
> I discovered that the machine had a stack register never initialized

That's right, see node 187: the "write" external signal is never asserted
during a reset (so that the CPU will not do a "wild" write; the stack
pointer isn't initialised).

Segher

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