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

From: Professor Dredd (profdredd_at_yahoo.com)
Date: 2001-03-12 16:57:26

John,

I was afraid I might have confused someone by saying
'video RAM' and it looks like I did! See, if I
understand correctly, the 16 Mb will be fully
accesable to the 6502, presumably through some new
MMU-type device. If that's the case, then having more
RAM on board is always better!

I can browse the web quite comfortably on my PC at
640x480x16-bit. For this reason I believe those should
be the minimum capabilities of the board.

If Jeri can provide:
- 640x480x16-bit VGA
- 25-30 Mhz 6502
- at LEAST 16 Mb RAM
- 65816 option socket
- ETHERNET and/or USB
then I'll be VERY VERY VERY happy with it. In fact,
I'll be EXCEEDINGLY HAPPY!  :-)

--- John West McKenna <john@ucc.gu.uwa.edu.au> wrote:
> Professor Dredd writes:
> 
> >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.
> 
> If it can only be used for video, then 16MB is a
> LOT.  A 1600x1200 32 bit
> frame buffer requires 7.5MB.  You can double-buffer
> that and still have 16
> times the C64's memory left over.  1024x768x24 is
> only 2.25MB.
> 
> John
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