ISA expansion boards

Recreates the circa-1990 AdLib OPL2 FM-synthesis sound card as a buildable open hardware project.

For this platform (bus/interface): The board design uses an ISA bus connector and the standard AdLib I/O address region. No narrower 8-bit or 16-bit compatibility tag is assigned without a clearer host-width statement.

This is a self-assembly reproduction rather than a currently sold assembled card. The repository has no packaged release; use the project files and parts list directly.

Recreates the Gravis Ultrasound PnP ISA sound card around an AMD InterWave chip, with an optional IDE CD-ROM interface.

For this platform (bus/interface): The project explicitly identifies this as an ISA card, not EISA. The optional IDE CD-ROM function uses a programmed 16V8 GAL for bus buffering and address decoding.

The maker has not fabricated or tested this board and has not generated a fabrication package. It also requires an AMD AM78C201 InterWave chip. Treat it as an experimental design and build at your own risk.

Provides MDA and CGA-compatible display modes with 31 kHz VGA output for modern monitors and capture devices.

For this platform (bus/interface): The repository identifies this as an ISA video card. It can emulate MDA or CGA and provide standard-frequency VGA output, with mode and hardware options configured on the card.

This is a self-assembly project. The maker advises checking for shorts between each power rail and ground before installation; the oscillator configuration also affects CGA composite color accuracy.

Open hardware reproductions of the two interface cards used to connect an IBM PC or XT to a 5161 Expansion Unit.

For this platform (exact model): These are 8-bit ISA interface cards, but the documented host application is specifically an IBM PC or XT connected to a 5161 Expansion Unit or a suitable replacement backplane.

Current 8-bit ISA adapter that lets a CompactFlash card serve as an XT-IDE hard disk in an IBM PC or XT-class computer.

For this platform (bus/interface): This is an 8-bit ISA CompactFlash adapter with an XT-IDE option ROM. Verify that the host BIOS can initialize option ROMs and that its configured I/O and ROM addresses do not conflict with other cards.

Current multifunction 8-bit ISA card that adds emulated storage, memory, networking, and USB or SD-connected devices to PC/XT-class computers.

For this platform (bus/interface): The current vendor page identifies PicoMEM as an 8-bit ISA expansion card. Its emulated RAM can be slower than native memory, so check the project's performance guidance for the intended host.

Recreates the 1989 Sound Blaster 1.0 with digital playback and recording, AdLib-compatible synthesis, CMS audio, and a joystick/MIDI port.

For this platform (bus/interface): The project is an ISA Sound Blaster 1.0 clone with configurable I/O address, IRQ, and DMA settings. Like the original card, it does not require the ISA -5 V rail.

This is a self-assembly project. Follow the documented bodge resistor, MIDI jumper-wire, firmware, DMA, IRQ, joystick, and I/O-address instructions before use.

DIY 8-bit ISA CompactFlash adapter that provides mass storage and supports an XT-IDE BIOS extension ROM.

For this platform (bus/interface): The project explicitly identifies the board as an 8-bit ISA interface. Choose free I/O and option-ROM addresses, and use a host BIOS that can initialize the extension ROM.

The project supplies build files and documentation rather than a direct retail order path.