Version 0.2.5 Release - 07/31/23

This is intended to be the last release of 0.2 untilversion 0.4!

Changelog:

Features

• POST_TEST_KEY option to disable only keyboard POST "stuck key" test
• MDA_ATTR option to remove MDA character attributes from POST screen (workaround issues with some Herc clone font ROMs)
• POST_OPT_ROM option to display extension ROM segment, size and checksum errors (instead of just silently skipping it)
• MAX_RAM_AUTO option to auto-detect maximum low memory size based on motherboard video DIP switch settings: 734K for CGA, 704K for MDA otherwise 640K (enabled by default for emulator build).
• FDC_IPL_SW option to use motherboardswitch 1 (IPL/test mode) to disable floppy drive tests if not installed
• Hard drive size and geometry displayed in two columns
• TD_HIMEM clear and display high memory bank on ST-12/TD3300

Platform Support

• MartyPC
• Vendex 888-XT/PB88/Samsung - Turbo/speed hotkey support
• UMC UM82C088/ALi M1101 - Turbo/speed hotkey and memory sizing support

Fixes

• INT 13h correct number of sectors written for format operations
• Function key+Shift+Ctrl and Ctrl+PgUp return correct scan codes
• Print screen LPT timeout
• Second pass of memory test pattern fix
• Disable keyboardHLT on TD3300

Real Time clock support now available withGLaTICK!

ROM standard builds

Additional chipsets / platforms

Testing/Beta

Emulators

Version 0.2.4 Release - 04/11/23

Changelog:

• PCXT_MiSTer support
• ARCH_SUB_TYPE build option to allow easier building of architecture sub-types
• Improved support of 16550A (#28)
• ROM BASIC enabled by default on FE2010A (thx to@csoren for the suggestion!)

Real Time clock support now available withGLaTICK!

ROM standard builds

Other chipsets

Additional platforms

0.2.3 micro_8088/NuXT (0.2.4 full images coming soon)

Please send any hardware/software or compatibility reports or feedback to640kb@glabios.org.

Contributors

Version 0.2.3 Release - 01/10/23

Changelog:

• Floppy drive seek now enabled for 5150
• DiskMBR check disabled (for DOS 1.0) by default on 5150 and 5160 (thx to@telanus for the suggestion)
• Floppy Drive checks can be completely disabled (default for EMM homebrew)

ROM standard builds

Additional platforms

Beta platforms

Still in development but considered stable.

Please send any hardware/software or compatibility reports or feedback to640kb@glabios.org.

Contributors

Version 0.2.2 Release - 12/09/22

Changelog:

• Boot WARM/COLD now enabled for 5150
• Smoother text rendering on memory test count
• DiskMBR check disabled (for DOS 1.0) by default on 5150 and 5160 (thx to@telanus for the suggestion)
• Option to disable RAM parity check during POST test
• Midnight flag on BDA timer now increments instead of just1 (thx to@ecm-pushbx for thesuggestion!)

Please send any hardware/software or compatibility reports or feedback to640kb@glabios.org.

ROM standard builds

Alternate platforms

Notes

E/EPROM notes

The BIOS image is 8K (same as the original PC, XT v1 and most clones). If your motherboard has an 8K ROM socket and you're using a larger E/EPROM it may be necessary to write the image repeated multiple times to work with the unused address lines.

If your motherboard uses a 16K or 32K ROM, the image will need to either be written multiple times or to the last 8K block in the E/EPROM.

ROM BASIC: If your motherboard uses a 32K ROM with BASIC ROM at0xF600 you can extract the top 24K ofU18 and write that into the new 32K ROM's0x0000-0x5FFF space, with the GLaBIOS code starting at relative offset0x6000.

Special Builds

• WD 1002x-WX1/WX2 MFM hard drive controllers (ROM versions 62-000043-0xx known affected) have bugs that affect the ROM POST screen display of hard disk geometry and sizes requiring those be disabled. If you use one of those, build withPOST_HD_CHECK = 0 to work around or email640kb@glabios.org for a custom build.

Contributors

Version 0.2.1 Release - 12/05/22

Version 0.2.1 contains minor updates and fixes.

• Fixed a keyboard issue with Multi-Floppy BIOS 2.2 configuration when adding a drive.
• EMM Homebrew 8088 keyboard fix, mini boot loader for CH37X v0.52 image.
• Numerous inline documentation and byte optimization updates.

Please send any hardware/software or compatibility reports or feedback to640kb@glabios.org.

ROM standard builds

Alternate platforms

Notes

E/EPROM notes

The BIOS image is 8K (same as the original PC, XT v1 and most clones). If your motherboard has an 8K ROM socket and you're using a larger E/EPROM it may be necessary to write the image repeated multiple times to work with the unused address lines.

If your motherboard uses a 16K or 32K ROM, the image will need to either be written multiple times or to the last 8K block in the E/EPROM.

ROM BASIC: If your motherboard uses a 32K ROM with BASIC ROM at0xF600 you can extract the top 24K ofU18 and write that into the new 32K ROM's0x0000-0x5FFF space, with the GLaBIOS code starting at relative offset0x6000.

Special Builds

• WD 1002x-WX1/WX2 MFM hard drive controllers (ROM versions 62-000043-0xx known affected) have bugs that affect the ROM POST screen display of hard disk geometry and sizes requiring those be disabled. If you use one of those, build withPOST_HD_CHECK = 0 to work around or email640kb@glabios.org for a custom build.

Version 0.2 Release - 11/15/22

Version 0.2 is a significant update to version 0.1 adding numerous performance and stability improvements as well as new features and support for more hardware platforms.

• Cassette tape support on5150 PC.
• Support forFaraday FE2010A-based PCs (Headstart Plus/TURBO 888-XT/VTI Vendex 33-XT/PC-10 and others) including hotkey speed switching, floppy, FPU and memory auto-detection.
• Support forEMM Homebrew 8088 with 8088, V20 or V40.
• Emulator-optimized build: significant performance increase on virtual hardware.
• Experimental support for micro_8088 / NuXT.
• Greatly expanded feature customization and personalization at build time (see source for details!).

Please send any hardware/software or compatibility reports or feedback to640kb@glabios.org.

ROM main builds

Alternate builds

Notes

E/EPROM notes

The BIOS image is 8K (same as the original PC, XT v1 and most clones). If your motherboard has an 8K ROM socket and you're using a larger E/EPROM it may be necessary to write the image repeated multiple times to work with the unused address lines.

If your motherboard uses a 16K or 32K ROM, the image will need to either be written multiple times or to the last 8K block in the E/EPROM.

ROM BASIC: If your motherboard uses a 32K ROM with BASIC ROM at0xF600 you can extract the top 24K ofU18 and write that into the new 32K ROM's0x0000-0x5FFF space, with the GLaBIOS code starting at relative offset0x6000.

Special Builds

• WD 1002x-WX1/WX2 MFM hard drive controllers (ROM versions 62-000043-0xx known affected) have bugs that affect the ROM POST screen display of hard disk geometry and sizes requiring those be disabled. If you use one of those, build withPOST_HD_CHECK = 0 to work around or email640kb@glabios.org for a custom build.

Shoutouts

Huge thanks to@maxtherabbit,@Maxx1234 and@PickledDog for bug-finding and testing! And@Raffzahn as always for specs, advice and giving me a hard time when I need it.

Bonus Material

The Epictronics 1-bit Dance Party

Contributors

Version 0.1.8 - 11/07/22

This version includes all bug fixes to date and is intended to be the last release of the 0.1 branch.

Please send any hardware/software or compatibility reports or feedback to640kb@glabios.org.

ROM main builds

Alternate builds

E/EPROM notes

The BIOS image is 8K (same as the original PC, XT v1 and most clones). If you use a 32K ROM in an 8K slot it may be necessary to write the image repeated 4 times to work with the unused address lines.

ROM BASIC: If your motherboard uses a 32K ROM with BASIC ROM at0xF600 you can extract the top 24K ofU18 and write that into the new 32K ROM's0x0000-0x5FFF space, with the GLaBIOS code starting at0x6000.