01 October 2009, 21:17 | #1 |
Registered Whdload user
Join Date: Oct 2006
Location: Finland
Age: 48
Posts: 532
|
Maximum amount of supported RAM in OS 3.1?
Forgive me my stupidity, but I couldn't find this piece of info from wikis or anywhere else (or I just didn't know the right terms). What is the maximum amount of RAM OS 3.1 supports?
|
01 October 2009, 21:26 | #2 |
Registered User
Join Date: Jan 2009
Location: M'Gladbach
Age: 47
Posts: 621
|
In the WinUAE.chm (Background Information) is this about RAM:
Depending on the processor variant, you can expand the RAM up to 10 MB or theoretically up to 2 GB. The limit of 2 GB is valid for the Amiga models A3000 and A4000. On the mainboard of these computers you can plug in up to 18 MB RAM, and for every of the four Zorro-III bus expansion you can expand the memory to the maximum! But no words about the used WB's version |
01 October 2009, 21:27 | #3 |
uber cool demi god
Join Date: Jun 2006
Location: Kent/England
Posts: 2,073
|
I thought it depended on the processor or something?
EDIT: Beaten by a better post!!! |
01 October 2009, 21:36 | #4 |
Registered Whdload user
Join Date: Oct 2006
Location: Finland
Age: 48
Posts: 532
|
Ok, I was thinking about my A1200. Any experiences with the maximum amount of RAM in OS 3.1?
|
01 October 2009, 21:37 | #5 |
Targ Explorer
|
256MB is the most that any A1200 accelerator can access (BPPC) Ergo 256MB is the maximum RAM accessible to OS3.1
|
01 October 2009, 21:44 | #6 |
Registered User
Join Date: Jan 2002
Location: Germany
Posts: 7,035
|
There is no limit in software. All OS versions from 1.0 to 3.9 support all RAM which can exist in hardware. The address space of a 32bit processor is 4GB, so this is the natural limit.
In reality, in the original A1200 case you can have 256 MB as can be put on the BPPC. In a tower case with a Zorro3 busboard you can expand memory the same way as on an A3000/A4000. |
01 October 2009, 21:44 | #7 |
WinUAE developer
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 49
Posts: 26,574
|
Only OS limit (all versions, including KS 1.x) is high address bit which can't be one because some exec memory routines (mis)use it as a flag = slightly under 2G max.
Existing hardware rarely supports more than 256M or so. EDIT: nice posting timing.. |
01 October 2009, 21:45 | #8 |
Registered Whdload user
Join Date: Oct 2006
Location: Finland
Age: 48
Posts: 532
|
Ok, thanks That 256 MB sure is plenty
|
01 October 2009, 21:45 | #9 |
Targ Explorer
|
I suppose if we are being pedantic, the max RAm in a classic A1200 is closer to 258MB (2MB Chip 256 Fast)
|
01 October 2009, 21:56 | #10 |
Doogster
Join Date: Dec 2007
Location: Dorset
Posts: 1,069
|
262mb if you add 4mb sram by pcmcia
|
01 October 2009, 23:29 | #11 |
Thalion Webshrine
Join Date: Jan 2004
Location: Oxford
Posts: 14,478
|
Someone over at Amiga.org had trouble going over 384Mbytes FastRAM.
128MByte on the CSPPC 128MByte on DKB3128 (1) 128MByte on DKB3128 (2) 128MByte on DKB3128 (3) No matter what he did he was unable to get the third card to work correctly. |
01 October 2009, 23:29 | #12 |
Targ Explorer
|
bah! yet again I am beaten by a more pedantic Amigan
|
02 October 2009, 03:22 | #13 |
Doogster
Join Date: Dec 2007
Location: Dorset
Posts: 1,069
|
|
02 October 2009, 04:38 | #14 |
Registered User
Join Date: Aug 2001
Location: Connecticut USA
Posts: 617
|
Yeah, I saw that thread about the DKB boards, and it's probably a bug in the Z3 autoconfig code. Y'know, they probably didn't test it with a gigabyte of RAM, since at the time they made the machines it would have been ungodly expen$ive to add that much memory to a machine.
But as for the OS itself, as Toni said, up to 2GB of RAM since the executive is "bad" and uses bit #31 as a flag for some routines, notably to mark the last entry in a table of addresses. |
02 October 2009, 05:24 | #15 |
Moderator
Join Date: Nov 2004
Location: Eksjö / Sweden
Posts: 5,690
|
|
02 October 2009, 08:16 | #16 |
WinUAE developer
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 49
Posts: 26,574
|
Probably bug in handling of multiple expansions or merging of multiple cards' address spaces because single 1.5G Z3 expansion works in UAE.
|
02 October 2009, 08:25 | #17 |
I hate potatos and shirts
|
IIRC, the bug itself is in the expansion.library.
|
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
Thread Tools | |
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
ACATune not supported | Retrofan | support.Other | 3 | 03 September 2012 01:24 |
PowerPC supported software under OS 3.9 | diablothe2nd | support.Other | 2 | 10 May 2012 09:07 |
Maximum files? | Brakus | Coders. General | 3 | 15 May 2009 08:32 |
Maximum Overdrive 2 | Paradroid90 | support.Demos | 1 | 12 September 2008 05:12 |
games that need to be supported | dlfrsilver | Games images which need to be WHDified | 0 | 08 January 2006 01:25 |
|
|