Max Fast Memory In WinUAE

CodyJarrett · 19 April 2002, 08:58

Toni - why is the maximum Fast memory possible in WinUAE 8 meg? Is it not easy to use more memory, especially when a lot of us have 512Mb in our PCs?

Toni Wilen · 19 April 2002, 09:37

"Regular" fast memory is limited to 8MB (this is Amiga hardware limitation). Use Z3 fast for max 512MB of RAM...

jmmijo · 19 April 2002, 09:38

Quote:

Originally posted by Toni Wilen
"Regular" fast memory is limited to 8MB (this is Amiga hardware limitation). Use Z3 fast for max 512MB of RAM...

Also, isn't the Z3 Fast RAM supposed to be faster? And Toni, under Winuae does it indeed emulate faster? Just curious

CodyJarrett · 19 April 2002, 09:39

Doh! Thanks Toni...

Toni Wilen · 19 April 2002, 10:31

Under UAE CPU's memory accesses aren't slowed down by bus contention yet and emulated "bus width" is always 32-bit. This means All RAM types' speed is equal. (and this also means Chip RAM is usually too fast..)

jmmijo · 19 April 2002, 10:43

Makes sense, do you suppose this could be the cause of some compatibility with certain games? I mean this would not be considered cycle exact emulation would it?

19 April 2002, 12:27

I have 32mb of ram on my Blizzard 1230-IV and it is displayed as fast ram under workbench. Anyone care to explain?

Toni Wilen · 19 April 2002, 12:55

Quote:

I have 32mb of ram on my Blizzard 1230-IV and it is displayed as fast ram under workbench

Z3 Fast is 32-bit and located at 32-bit address space (>= 0x10000000), regular fast ram is 16-bit and located at 0x200000-0xa00000. Both are usually called "fast ram".

Quote:

Makes sense, do you suppose this could be the cause of some compatibility with certain games

I am 110% sure it causes problems.

19 April 2002, 13:10

Then some part (or all) of my 32mb of ram is indeed Z3. Does this cause incompatibilities even though I'm using a real Amiga?

Toni Wilen · 19 April 2002, 14:21

Quote:

Then some part (or all) of my 32mb of ram is indeed Z3. Does this cause incompatibilities even though I'm using a real Amiga?

There is no problems. I was replying to jmmijo's cycle-exact cpu memory access question. (sorry for bad quoting..)

All >8MB Fast RAM expansions are Z3 and need 32-bit addressing (68020 or better, 68EC020 and older support only 16MB address space)

19 April 2002, 15:11

Thanks for the clarification.

jmmijo · 19 April 2002, 21:18

Quote:

Originally posted by Toni Wilen
All >8MB Fast RAM expansions are Z3 and need 32-bit addressing (68020 or better, 68EC020 and older support only 16MB address space)

and this means that any Z2 boards, in a real Amiga that is, that have RAM expansion on them are also considered 16-bit fast ram. One of the differences then between Z2 and Z3 boards is the address bus size on the Zorro bus connectors. Is this correct Toni?

19 April 2002, 08:58	#1
CodyJarrett Global Moderator Join Date: Mar 2001 Location: UK Age: 46 Posts: 6,166	Max Fast Memory In WinUAE Toni - why is the maximum Fast memory possible in WinUAE 8 meg? Is it not easy to use more memory, especially when a lot of us have 512Mb in our PCs?

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19 April 2002, 09:37	#2
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,546	"Regular" fast memory is limited to 8MB (this is Amiga hardware limitation). Use Z3 fast for max 512MB of RAM...

19 April 2002, 09:39	#4
CodyJarrett Global Moderator Join Date: Mar 2001 Location: UK Age: 46 Posts: 6,166	Doh! Thanks Toni...

19 April 2002, 10:31	#5
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,546	Under UAE CPU's memory accesses aren't slowed down by bus contention yet and emulated "bus width" is always 32-bit. This means All RAM types' speed is equal. (and this also means Chip RAM is usually too fast..)

19 April 2002, 10:43	#6
jmmijo Junior Member Join Date: Jan 2002 Location: PDX Age: 62 Posts: 2,396	Makes sense, do you suppose this could be the cause of some compatibility with certain games? I mean this would not be considered cycle exact emulation would it?

19 April 2002, 12:27	#7
oldpx Posts: n/a	I have 32mb of ram on my Blizzard 1230-IV and it is displayed as fast ram under workbench. Anyone care to explain?

19 April 2002, 13:10	#9
oldpx Posts: n/a	Then some part (or all) of my 32mb of ram is indeed Z3. Does this cause incompatibilities even though I'm using a real Amiga?

19 April 2002, 15:11	#11
oldpx Posts: n/a	Thanks for the clarification.

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