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Old 08 September 2016, 01:58   #1
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WinUAE: Using RAM OS3

I noticed that on OS3 you can set up to 512 RAM, the system starts quietly and many applications seem to work properly. Now I ask Toni if this amount of RAM is true, if there are any contraindications to use and which instead it would be the right amount of RAM to be set.

In the test I set the RAM as well:

256MB Z3 Fast RAM
256MB 32-bit Chip
1,8 MB Slow

Last edited by AMIGASYSTEM; 27 September 2016 at 00:21.
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Old 08 September 2016, 14:00   #2
Toni Wilen
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Join Date: Aug 2001
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Age: 44
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It depends..

Slow RAM is totally pointless in expanded configurations. No program that requires slow ram is going to work with fast CPUs and RTG anyway

Hige Chip RAM size is also mostly pointless, maybe max 16M or so makes sense in some specific situations.

Something like 1.5G of total RAM is possible without side-effects. (by using multiple Z3 boards, 3.4 required)

~3G is possible (64-bit winuae needed) but because it has to cross 2G "border" and some low level memory routines in exec stupidly use bit 31 as error bit, you'll get reboot loops or crashes if any reset proof program (including setpatch) tries to use "high" ram.. >2G also confuses most memory size reporting routines, you get negative free ram etc.. (just like >2G drive free space reporting)
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Old 08 September 2016, 14:57   #3
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Thanks Toni for the answer now I have the ideas a little 'clearer.
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