Date   : Sun, 12 Apr 2009 00:57:45 +0100
From   : dm.hunt@... (David Hunt)
Subject: Faster, faster

> Okay, a more revealing snapshot (watch out, rather big,
> 4.7 MB) :
> 
> http://212.123.133.121:8080/home/media/images/ReCo6502_Proto.jpg
> 
> It is a 'remake' of the 6502 second processor for the
> BBC range. With a few extras that were irresistible :
> 
> - Supports existing 65C02, 3 or 4 MHz
> - Supports WDC 65C02 or 65C816, 14 MHz (and can run
>   at this speed, i.e. with the ULA accessed at 3 MHz)
> - Supports up to 512 KB of RAM, which can (currently)
>   be bankswitched, or used 'as is' by a 65C816 running
>   in native mode (16-bit data, 24-bit addressing).
> 
> The 65C816's native mode is (as yet) not supported by
> the Tube OS and e.g. BASIC. But it is possible to run
> machine code programs that temporarily switch to native
> mode and can then use 512 KB linearly addressable memory.
> 
> The 'remake' does need the box and the original Tube ULA
> from an existing 6502 second processor. I.e. (as yet ...)
> it is not standalone, but either a replacement or an
> upgrade. This is, and will probably remain, its main
> purpose.
> 
> 
> John Kortink

Wow! When is this available? How much will it cost?

Are you fixing the clock at 14MHz or are you going to allow it to go to
20MHz?

I recall an WDC licensed FPGA IP core implementation running at 133MHz, I
got the guy's business card buried somewhere around.

Personally, I'd like a 6502 SP with a bit more bite on the performance
front, I have Sprow's ARM7/32MB internally, but I've not seen a 6502 SP
emulator for it so I just mess around with a few bits of BASIC and ARM asm. 

Could you replace the ULA with a CPLD ? That would remove the need to
salvage them from (working) vintage boards.

After being in Asia for months sat inside clean rooms looking at the latest
and greatest in display technology, Beeb stuff is positively refreshing ;)

Cheers

Dave ;)

P.S. I missed Byte Back again, damn, I need a new job that I can schedule...