Question about 32-bit ram

sink · 12 January 2011, 09:09

my question is very simple

.. i tryp to setup a A4000T with this libs: http://powerup.amigaworld.de/download.php?id=1 that work very great but about RAM it's usefull to up the chip ram or 2MB is really enought for a 4000 ? and for the 32-bit chip ram... This ram is used on one a4000T? And has what corresponds this ram in fact? thk already

Zetr0 · 12 January 2011, 09:21

@sink

I am a little confused,

As far as I know, the maximum amount of Chip RAM on any Amiga is 2MB.

The A4000 and the A4000T can have upto 16MB of FAST ram (in 4 banks of 4MB) this combined with the chip ram will give you a total of 18MB (2MB CHIP/16MB FAST)

the 2MB CHIP is shared with all the custom chips - each chip uses the 2MB CHIP RAM pool and the CPU feeds in and take data out of this area.

Fast RAM is ONLY used by the CPU, no custom chip can use this space - because of this the CPU doesn't have to wait for other custom chips to do their task and take full advantage of this area to run as FAST as possible - hence the name FAST RAM =)

The only Virtual RAM program I remember allowed you to use hard drive space as paged memory (as long as you had an MMU I think)

Anyway I do hope that helps.

sink · 12 January 2011, 09:32

damm morning

.. it's no about virtual ram in facts, i would like just to know if under winuae if i up a virtual A4000T 32-bit chip ram is usefull or not..
thk zetr0 for your speed answer .. and sorry for my bad thread name,.. need more coffe

)

TCD · 12 January 2011, 09:41

Quote:

Originally Posted by sink

and sorry for my bad thread name,..

Fixed that for you

thomas · 12 January 2011, 10:11

Quote:

Originally Posted by sink

damm morning

.. it's no about virtual ram in facts, i would like just to know if under winuae if i up a virtual A4000T 32-bit chip ram is usefull or not..
thk zetr0 for your speed answer .. and sorry for my bad thread name,.. need more coffe

)

If you add more than 2 MB Chip ram, it's not an A4000T any more because a real Amiga cannot have more than 2 MB Chip ram.

But yes, certainly it's useful, otherwise Toni wouldn't have added the option. If you use the native Amiga chip set for graphics, you can never have enough Chip RAM.

If you use a graphics card (RTG mem + Picasso96) then Chip RAM is not so important.

sink · 12 January 2011, 11:25

thecyberdruid: thk a lot!!
thomas: oki i understand now.. you too thk a lot!

last question about ram .. for RTG graphic card 4mb (like true cards) is enough? 'cauze i use Winuae only for looking and capturing demos..

thomas · 12 January 2011, 11:45

If you don't use the emulated graphics card, then you don't need one. Set RTG mem to 0 then.

You can calculate the amount of RTG memory a screen needs from its resolution by this formula:

with * height * depth_in_bytes / 1024 / 1024

For example a 1680 x 1050 screen with 32 bits calculates like this:

1680 * 1050 * 4 / 1024 / 1024 = 6.7 MB

So if you want to open your Workbench screen with this resolution, you need at least 8 MB of RTG memory. If you want to open some windows on this screen also, you should better use 16 or 32 MB.

sink · 12 January 2011, 12:02

excellent!! thk thk thomas!! and i think that this answer can interest the other persons.

12 January 2011, 09:09	#1
sink Registered User Join Date: Jan 2006 Location: france Age: 53 Posts: 197	Question about 32-bit ram my question is very simple .. i tryp to setup a A4000T with this libs: http://powerup.amigaworld.de/download.php?id=1 that work very great but about RAM it's usefull to up the chip ram or 2MB is really enought for a 4000 ? and for the 32-bit chip ram... This ram is used on one a4000T? And has what corresponds this ram in fact? thk already

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12 January 2011, 09:21	#2
Zetr0 Ya' like it Retr0? Join Date: Jul 2005 Location: United Kingdom Age: 49 Posts: 9,768	@sink I am a little confused, As far as I know, the maximum amount of Chip RAM on any Amiga is 2MB. The A4000 and the A4000T can have upto 16MB of FAST ram (in 4 banks of 4MB) this combined with the chip ram will give you a total of 18MB (2MB CHIP/16MB FAST) the 2MB CHIP is shared with all the custom chips - each chip uses the 2MB CHIP RAM pool and the CPU feeds in and take data out of this area. Fast RAM is ONLY used by the CPU, no custom chip can use this space - because of this the CPU doesn't have to wait for other custom chips to do their task and take full advantage of this area to run as FAST as possible - hence the name FAST RAM =) The only Virtual RAM program I remember allowed you to use hard drive space as paged memory (as long as you had an MMU I think) Anyway I do hope that helps.

12 January 2011, 09:32	#3
sink Registered User Join Date: Jan 2006 Location: france Age: 53 Posts: 197	damm morning .. it's no about virtual ram in facts, i would like just to know if under winuae if i up a virtual A4000T 32-bit chip ram is usefull or not.. thk zetr0 for your speed answer .. and sorry for my bad thread name,.. need more coffe )

12 January 2011, 11:25	#6
sink Registered User Join Date: Jan 2006 Location: france Age: 53 Posts: 197	thecyberdruid: thk a lot!! thomas: oki i understand now.. you too thk a lot! last question about ram .. for RTG graphic card 4mb (like true cards) is enough? 'cauze i use Winuae only for looking and capturing demos..

12 January 2011, 11:45	#7
thomas Registered User Join Date: Jan 2002 Location: Germany Posts: 6,985	If you don't use the emulated graphics card, then you don't need one. Set RTG mem to 0 then. You can calculate the amount of RTG memory a screen needs from its resolution by this formula: with * height * depth_in_bytes / 1024 / 1024 For example a 1680 x 1050 screen with 32 bits calculates like this: 1680 * 1050 * 4 / 1024 / 1024 = 6.7 MB So if you want to open your Workbench screen with this resolution, you need at least 8 MB of RTG memory. If you want to open some windows on this screen also, you should better use 16 or 32 MB.

12 January 2011, 12:02	#8
sink Registered User Join Date: Jan 2006 Location: france Age: 53 Posts: 197	excellent!! thk thk thomas!! and i think that this answer can interest the other persons.

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