vislosa.blogg.se

The original MemTest86 was continued to be developed across 2004 to 2013, with multiple updates made - most notably the stable Version 4.0 release.

Nevertheless, both Memtest86s subsequently continued to be developed. The naming was unfortunate as it now leads to total confusion between users. MemTest86 was released as free open source (GPL) software during this period.īetween 2002 – 2004 (during the time period of the MemTest86 V3.0 release and there wasn't much activity from Chris) the code was 'forked' by Samuel Demeulemeester (formally part of the French CanardPC publishing group in France) into another version of the software called MemTest86+. Between 19, support for 64bit was added (but only via PAE paging), new CPU types, symmetrical multiprocessors and many other features have been added during this period. Since then, there have been more than a dozen new versions released. However, some of the testing algorithms used have been under development since 1981 and were previously implemented on Dec PDP-11, VAX-11/780 and Cray XMP (an old super computer) architectures. Similarly, CPU that are "32-bit" also have parts that are 128 bits (or more) wide.MemTest86 (without the plus) was originally developed by Chris Brady (BradyTech Inc) with a first release in 1994. Of more than 4 GB of memory by a single executable program-no more, noīeginning with version 10.4, Mac OS X supports command-line 64-bitĮxecutables on G5-based Macintosh computers and 64-bit-capable Intelīeginning with version 10.5, Mac OS X supports full-featured 64-bitĪpplications on G5-based and 64-bit-capable Intel Macintosh computers.īeginning with Snow Leopard, Mac OS X uses a 64-bit kernel on someĪlso - CPU that are "64-bit" still have parts that are only 32 bits wide. Support for a 64-bit address space-that is, support for concurrent use What Is 64-Bit Computing?įor the purposes of this document, 64-bit computing is defined as You can have 32 bit code run on a 64 bit CPU.Ī nice overview of this subject is at Apple's 64-bit Transition Guide Keep in mind, this transition was started before Tiger was released on Apand is effectively complete. As you may have seen from all the answers - macs are different than other Operating Systems (OS) in that the 32 bit and 64 bit dividing line is all blurry.