Welcome to FreeDOS

Jemm is an "Expanded Memory Manager" (EMM), based on the source of FreeDOS EMM386. Jemm is split into two versions: Jemm386 is the standard version which also needs an external extended memory manager like HIMEM to be loaded, and JemmEx is the extended version that already has an extended memory manager in it. Japheth recently released a new version of Jemm with several fixes, such as + fixed regression in v5.86: exceptions in PL0 were displayed incorrectly + AHCICD: driver now supports long reads in "raw mode" + Int 15h, ah=87h: returns error 02 instead of 80h if limit out of range. See the Jemm 5.87 release page for the full list of changes, and to download the latest version. We've also mirrored this version in the FreeDOS Files Archive at Ibiblio, under /dos/emm386/jemm

JWasm is a MASM-compatible assembler that runs under DOS and other operating systems. Japheth has released a new version of JWasm with a bunch of fixes and changes, including: + macro arguments: curly braces now handled Masm-compatible + operator MOD returned wrong results for negative operands + model TINY, predefined symbol @code: changed from _TEXT to DGROUP + fixed GPF in jwasm: assembling MOV instruction with destination of type prototype, but without pointer type definition. Check out the full change log and download the latest version on the JWasm 2.21 release page. We've also mirrored this version in the FreeDOS Files Archive at Ibiblio, under /devel/asm/jwasm

Javier Gutiérrez Chamorro has made a huge update to his Zerofill tool, which fills empty space on a drive with zeroes (helps with virtual machine disk compression). Version 4.10 has huge improvements, including: Rewritten to avoid int64/long long so binary is smaller, Use bigger blocks and bigger file to make process twice as fast, Rewritten as TUI with WCONIO. Download and source code are available from Zerofill on Sourceforge

mTCP is a set of TCP/IP programs for your PC compatible computers running DOS. Mike Brutman recently announced that a new mTCP is available! This version has some bug fixes, adds black and white Sixel graphics to Telnet, makes Ping more accurate, and has major performance improvements for NetDrive. The HTTP server source code is also now included. Download the new from from the mTCP website

Please help us test the next version of FreeDOS! Thanks to Jerome, our distribution manager, we are able to share a new "test" distribution every month. These monthly releases collect all new changes, and act as a "test bed" to become the next official FreeDOS distribution, and we would like your help to test it. The new "T2610" ("T" for test, "26" for 2026, "10" for October) distribution includes updates to VSBHDA, SBEMU, Himem, TinyAsm, Blocek, Lynx, FDNPKG16, plus several new translations. Since August, we've also included an updated kernel and other tools. Download the test release and let us know if you have any problems.

Victoria Crenshaw has been working on FDNPKG16, the package manager that works on 16-bit computers. Victoria writes: "Fixed an insane amount of bugs. (10+) The version control log has all the changes. FDNPKG16 is very stable now." There may be another update coming soon, but needs your help testing this one first. Find it at FDNPKG16 on GitHub or more directly at ver. 0.99.8254f release

We announced the previous 0.99.8254e version a few days ago: "Newest version released is a massive bug fix with the networking a bit" and adds "It just needs 640k of RAM with 480k of free RAM." You can find it at FDNPKG16 on GitHub or more directly at the ver. 0.99.8254e release