Article View: comp.sys.amiga.tech
Article #1646Board Layout and Memory Allocation
From: Mark Waggoner
Date: Fri, 06 Oct 1989 19:24
Date: Fri, 06 Oct 1989 19:24
44 lines
1974 bytes
1974 bytes
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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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!uwm.edu!gem.mps.ohio-state.edu!brutus.cs.uiuc.edu!apple!voder!dtg.nsc.com!waggoner 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