🚀 go-pugleaf

In article <7173@sugar.hackercorp.com> peter@sugar.hackercorp.com (Peter da Silva) writes:

   In article <1990Nov30.144853.2562@diku.dk> bombadil@diku.dk(Kristian Nielsen) writes:
  >> It would be interresting (and usefull!) to hear if someone could
  >> comment on the above, add what I have forgotten or don't know,
  >> and correct me where (not if) I'm wrong.

  >I think you've done an admirable job of picking out the problems.
  >About the only one I can think of is that memory above 16M isn't
  >available to Zorro-II DMA, so you better make sure your disk
  >buffers are allocated below that if you do direct disk I/O on a
  >2000 with a 68020 and over 16M RAM.

    And the difference which kills AmigaBASIC:  The 68000 ignores the
upper 8 bits of addresses, but they are valid on the 68020/68030.
Using the upper bits of a pointer as flag bits is a VERY bad thing,
but some people never learn.  It would have been nice if the 68000
checked these bits and trapped, but it doesn't.


--

					Robert I. Eachus

with STANDARD_DISCLAIMER;
use  STANDARD_DISCLAIMER;
function MESSAGE (TEXT: in CLEVER_IDEAS) return BETTER_IDEAS is...