Date   : Fri, 04 Nov 2005 12:53:15 -0000
From   : "David Hunt" <dm.hunt@...>
Subject: Re: BBC using 3.5 high density format

> -----Original Message-----
> From: Majordomo List Manager [mailto:majordomo@...] On Behalf Of
> Pete Turnbull
> Sent: 04 November 2005 08:50
> To: bbc-micro@...
> Subject: Re: [BBC-Micro] Re: BBC using 3.5 high density format
> 
> On Nov 4 2005,  0:20, Jonathan Graham Harston wrote:
> 
> > However, the BBC Master runs at 3MHz, so a 41-cycle NMI routine
> > will be executed in 13.6us - easily enough to collect a byte every
> > 16us, and just enough allowing for jitter down to 14.5us.
> 
> Perhaps you're confusing the Master 128 with the Turbo or a 6502 Second
> Processor.  The second processors do run at 3MHz, but the CPU and DRAM
> clock in the Master is only 2MHz.
> 
> --
> Pete                                              Peter Turnbull
>                                           Network Manager
>                                           University of York

I remember some Acorn people saying the Master runs like a 3MHz BBC Micro
because of the rewritten BBC Basic for the 65C02 processor. The clock
frequency of the Master is 2MHz. The clock frequency of the 6502 Second
Processor is 3MHz and the Master Turbo 65C102 is 4MHz.

Dave ;)