Date   : Thu, 02 Oct 2003 18:45:57 +0100 
From   : Andrew Hancock <Andrew.Hancock@...>
Subject: Re: BBC Micro lazy delayed boot!

> -----Original Message-----
> From: Sprow [mailto:info@...]
> Sent: 02 October 2003 18:05
> To: Andrew Hancock
> Subject: Re: [BBC-Micro] BBC Micro lazy delayed boot!
> 
> In article
> <6A4F555CEA3CD5118DBD0002E30AC0912C0855@...>,
>    Andrew Hancock <Andrew.Hancock@...> wrote:
> 
> 
> > > -----Original Message-----
> > > From: Sprow [mailto:info@...]
> > > Sent: 01 October 2003 14:17
> > > To: 'bbc-micro@...'
> > > Subject: Re: [BBC-Micro] BBC Micro lazy delayed boot!
> 
> [snip]
> 
> > what's the state of nNMI and nIRQ during the 15s long pause?
> >
> > Is this Pin 4 and Pin 6 of the 6502 CPU IC1?
> 
> Yes,
> Robert.

WITH 8271 installed.

Pin 4 High to Low at power-on, then High with pulses of low > 30ns 
Pin 6 NMI PERMANENTLY HIGH. No transition observed.


WITHOUT 8271 installed.

Pin 4 High to Low at power-on, then High with pulses of low > 30ns
Pin 6 NMI PERMANENTLY LOW No transition observed.