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From: waggoner@dtg.nsc.com (Mark Waggoner)
Newsgroups: comp.sys.amiga.tech,comp.sys.amiga
Subject: Board Layout and Memory Allocation
Keywords: printed circuit board layout AllocMem memory
Message-ID: <119@dtg.nsc.com>
Date: 6 Oct 89 19:24:23 GMT
Reply-To: waggoner@dtg.nsc.com
Organization: National Semiconductor, Santa Clara
Lines: 44

QUESTION 1.
Does anyone have experience with any printed circuit board layout
programs for the Amiga.  I am interested in something that would
be capable of laying out a board for the 2000 using socketed fine 
pitch part(s).  What is fine pitch you may ask:
   
       |< .075 >|
   ___ o        o        o
   ^   |
   .20 |
   v   |
   ______ o        o        o
       |  |
       |<>|
       .025
             o        o        o 


Any comments on available software would be appreciated.  Feel free
to email.

QUESTION 2.
If you needed a chunk of memory and one of your constraints was 
that it had to be completely within a 64K boundary; In other words
the upper 16 bits of the address of all of the memory in the block
must be constant, how would you go about doing it.  The only
ways I can see are to either:
  1. Allocate more than you need, maybe 2X, and then figure out
     whether to start at the beginning or start somewhere in the
	 middle.
  2. Allocate what you need and if it doesn't fall within a 64K 
	 page, allocate again and keep hoping you will get what you want
	 eventually.
  3. Look at and mess with the free memory list directly - Undoubtedly
	 a no-no.
None of these seem very good.

Thanks,
    Mark

-- 
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|  Mark Waggoner   (408) 721-6306           waggoner@dtg.nsc.com     |
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