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A modern, scratch-built, open-source alternative BIOS for vintage PC, XT, 8088 Clone or Turbo PCs.

Copyright © 2022-2023,640KB and contributors.

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Source Code

• A complete100% PC Compatible BIOS for retro/vintage PC, XT, 8088 Clone, Turbo, Homebrew PCs and more!
• ColorfulPOST screen with useful information such as CPU, FPU, port addresses, floppy drives and hard disk geometry.
• FAST!Performance-optmized CGA/MDA text and graphics routines.
• 5150 Cassette tape support.
• NEC V20 enhanced instruction set support.
• Multiple levels of "CGA snow" removal (configurable at build-time).
• Accurate PIT-based I/O timing for floppy disk for faster seek and read times.
• Customizable POST test screen colors themes.
• Fits in an 8K ROM to drop in to any original PC or clone.

• PC/XT 5160 and clones
• PC 5150 with cassette
• Turbo XTs (DTK, most clones)
• Faraday FE2010A-based PCs (Headstart Plus/VTI Vendex 33-XT/PC-10 and others)
• TD3300A-based PCs (Juko ST, UNIQUE, Auva, etc)
• UMC UM82C088/ALi M1101 chipset
• micro_8088 /NuXT
• EMM Homebrew 8088 with 8088, V20 or V40
• Vendex 888-XT/PB88/Samsung
• Emulator-optmizedMartyPC,86Box and others
• VirtualXT

Companion ROMs are PC Option ROMs that add additional features and support to any standard BIOS (not just GLaBIOS).

• GLaTICK - ROM based support for ISA Real Time Clocks providingINT 1Ah services elimiating the need for DOS programs/drivers.

There are other excellent BIOS projects out there each with it's own design goals and use cases. The goals for GLaBIOS are:

1. A collborative learning effort among the Retro Community
2. A fully open-source PC BIOS, built and improved by the community, free of outside proprietary or copyrighted code
3. Feature-complete with full support for original vintage hardware as well as new projects

If you aren't familiar with the reference, ask a gamer.

Click here for how to make the BIOS ROMs.

OR try it LIVE!

• MartyPC
• VirtualXT

Check out the Wiki!

VGA with 8087 FPU andGLaTICK:

EGA with V20:

CGA with 736K memory:

Bad RAM detected! Use standardaddress and bit indicator to locate failed IC:

5150 with cassette:

1-2-3 ver 1A

Flight Simulator 1.0

Build using MASM 5 or later.

1. MASM GLABIOS;
2. LINK GLABIOS; Will create GLABIOS.EXE.
3. RunGLA2ROM GLABIOS to convert to an 8 KiB ROM file.

OR

1. Convert EXE manually by removing the EXE header (the first 512 bytes of the EXE file) and extracting the last 8 KiB
2. Calculate 8-bit checksum byte and insert into relative file offset1FFF in GLABIOS.ROM.

Please send bug reports, feedback, questions or thoughts to640kb@glabios.org or submit anIssue.

• https://stanislavs.org/helppc/
• https://sites.google.com/site/pcdosretro/
• http://www.minuszerodegrees.net/
• https://www.felixcloutier.com/x86/
• Font bitmaps by "VileR", (CC BY-SA 4.0)

• TheCode Golf (CGCC) community on Stack Exchange for helping me become a better ASM programmer.
• @dbalsom (aka gloriouscow) for moral support and the incredibleMartyPC emulator software.
• @Raffzahn, Contributor, Advisor and Meckerhut.
• @MadMaxx12345, @Makefile, @punishedbunny, @PickledDog and many others for testing, bug finding and feature suggestions.
• Hampa Hug for the excellentPCE software that helped make development and debugging much easier.
• Dave Nault, my partner in crime for 2 semesters of college assembly language programming classes back in the day. Wherever you are buddy, hope you're doing well!

• GNU General Public License v3.0. SeeLICENSE.

This project is built upon the collective knowledge of the community by and for the benefit of the community. Unless stated otherwise, cited public sources are considered as "public domain" or "fair use" of the copyrighted material as provided for in section 107 of the US Copyright Law. If your copyrighted material appears in this project or on this web site and you disagree with our assessment that it constitutes "fair use,"contact us.