Path: utzoo!attcan!uunet!cs.utexas.edu!rutgers!mit-eddie!uw-beaver!tektronix!psueea!jove.cs.pdx.edu!bartonr
From: bartonr@jove.cs.pdx.edu (Robert Barton)
Newsgroups: comp.sys.amiga.tech
Subject: The Future of HAM
Message-ID: <1579@psueea.UUCP>
Date: 11 Aug 89 02:15:48 GMT
Sender: news@psueea.UUCP
Reply-To: bartonr@jove.cs.pdx.edu (Robert Barton)
Organization: Dept. of Computer Science, Portland State University; Portland OR
Lines: 15


 jmdavis@cbnewsd.ATT.COM (j.michael.davis) writes:
>  At 8 bits per pixel, a HAM mode will be able to DISPLAY 256K COLORS AT ONCE,
> with a base register table of 64 colors.  (I know there are 256K pixels on a
> 512x512 screen, but you get the idea.)

  With 8 bits per pixel you would also need 18-bit color registers.  This won't
work with the current 16 bit register size.  A 7-plane mode would work if you
had 5-bit video DAC's.  In other words:

planes     registers     bits/reg     colors
  n         2^(n-2)       (n-2)*3   2^((n-2)*3)
  6           16            12          4096
  7           32            15         32768
  8           64            18        262144