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Re: Memory Allocation under GS/OS [message #63 is a reply to message #60]

Thu, 09 October 2014 20:14

Dagen
Messages: 27
Registered: August 2014
Location: United States

Member

You don't need to request/allocate the SHR display area. At least I don't think so. I don't believe that the Memory Manager handles that area. There are some special areas (like Bank 00 as well), which it doesn't touch. I'll try to find the documentation on this, or someone with more knowledge can reply. My understanding was that it's always safe to write to SHR areas at 01/2000-9FFF and E1/2000-9FFF (assuming you're the only program running of course and not an NDA or something).

Of course, before I submit this post, I found a technote ( http://apple2.gs/technotes/tn/iigs/TN.IIGS.052.txt ) which indicates it's possible to load a program into some of the "Special Memory" such as the SHR area. But I've never had this problem. I only use the Memory Manager to allocate memory for files I load like my graphics and sounds. I just write directly to SHR RAM for graphics. There really is no other way and even if someone else has allocated it that seems more like an indication of a bigger problem that I can't resolve. Just do it. What could possibly go wrong. ;)

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[Message index]

		Memory Allocation under GS/OS By: Oz on Tue, 07 October 2014 10:39
		Re: Memory Allocation under GS/OS By: AppleIIGSMarc on Thu, 09 October 2014 18:32
		Re: Memory Allocation under GS/OS By: Dagen on Thu, 09 October 2014 20:14
		Re: Memory Allocation under GS/OS By: Oz on Fri, 10 October 2014 01:00
		Re: Memory Allocation under GS/OS By: AppleIIGSMarc on Fri, 10 October 2014 11:14
		Re: Memory Allocation under GS/OS By: Oz on Sat, 11 October 2014 07:42

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