Operating systems based on Microsoft® Windows NT® provide applications with a 4 gigabyte (GB) virtual address space. The virtual address space is divided so that 2-GB is available to the application and the other 2-GB is available only to the system.

The 4GT RAM Tuning feature increases the memory that is available to the application up to 3-GB, and reduces the amount available to the system to between 1 and 2-GB. This benefits applications that run on computers with more than 2-GB of physical memory.

To enable this feature, add the /3GB switch to the Boot.ini file. This enables applications to use the first 3-GB of the address space on the following systems:

·        Windows Server 2003 x64 Editions family

·        Windows XP Professional Edition

·        Windows 2000 Datacenter Server

·        Windows 2000 Advanced Server

·        Windows NT Server 4.0 Enterprise Edition

Boot.ini file is placed in root of drive "c:." It is system file so it can be hidden.

Typical content of boot.ini :

[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Professional" /noexecute=optin /fastdetect

can be changed in the following way : 

[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Professional" /noexecute=optin /fastdetect /3GB

or by adding new configuration menu item:

[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Professional" /noexecute=optin /fastdetect
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Professional with 3GB" /noexecute=optin /fastdetect /3GB

Modifications/Improvements and bug fixes with respect to version v.6.22
 
1. Multidirectional body load has been implemented

Modifications/Improvements and bug fixes with respect to version v.6.21
 
1. Z_Post2D.exe: For Deformed Mesh option all elements were drawn as undeformed except continual one. This mistake concerns only version 6.21

Modifications/Improvements and bug fixes with respect to version v.6.18
 
1. Improvements in setting the initial condition for temperatures/pore pressures in case of  multi-excavation/construction stages; same node appearing few times may achieve a new initial condition at each new construction stage; application of a new initial condition at new construction stage can be made with aid of the proper existence function associated with an initial temperature/pressure superelement.

Modifications/Improvements and bug fixes with respect to version v.6.17
 
1. Stability analysis for beams has been corrected.

3D preprocessor

1. Opening a large examples with fluid heads has been improved.

Modifications/Improvements and bug fixes with respect to version v.6.13
 
1. In Cam-Clay and Cap models the initial preconsolidation pressure is set by means of OCR value
    a detailed procedure how this setting is handled is given in the enclosed pdf files:

cam-clay-init-pco.pdf
cap-init-pco.pdf

2. Improvements in the true Coulomb-Mohr model. 

3. Possibility of distributed fluid, heat and humidity fluxes definition on selected edges has been added to 2D preprocessor.

Modifications/Improvements and bug fixes with respect to version v.6.10
 

Calculation module

1. The whole calculation module has been recompiled with lower optimization level
    (due to random application errors appearing during large 3D computations)

2. The problem with nonstationary temperature field applied tomechanical analyses
    has been fixed ( the bug was caused by change of the format of the *.his file in v.6.xx)
 

3D postprocessor

1. Large output files ( larger than 4 Gb) are handled now correctly