RE: 6502 core / 128 mode (re: J-Board) (fwd)

From: Professor Dredd (profdredd_at_yahoo.com)
Date: 2001-03-13 13:03:48

Hello William,

I would encourage you to re-read my post and try that
again. 

I was referring to the 16 Mb SDRAM she's including.
That means 24 bits of addressing. I'm guessing she's
including some complex decoding logic similar to the
C-128's MMU to resolve the 24-bit addressing over the
16-bit buss. Still, wouldn't be very hard to widen a
'BANK' register by 8-bits, would it?


--- William Levak <wlevak@cyberspace.org> wrote:
> On Mon, 12 Mar 2001, Professor Dredd wrote:
> 
> > Honestly, I don't know exactly why she chose to
> limit
> > it to 16 Mb video RAM. That's only a 24-bit
> register.
> > I think I'd have gone for 32-bits, assuming the
> board
> > could electrically support that much RAM.
> 
> 24 bits is enough to produce 4,000,000 colors, which
> is more than enough
> since the human eye can only see 3,000,000.
> 
> 
> 
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