Beavis Ultrasound PnP ISA Sound Card Replica
Open-source replica of Gravis Ultrasound PnP with design details.
1Retro Sound Card Clone
The Beavis Ultrasound PnP ISA is an open-source replica of Gravis Ultrasound PnP. The design includes schematics and reverse-engineered GAL source code. It provides basic sound card functionality using an AMD InterWave chip.
2Hardware Specifications
The board measures 8.2 x 4.2 inches with 4 layers. ENIG plating suffices for edge connectors. The AMD78C201 chip handles all audio functions, while optional GAL programming enables IDE support.
3Assembly Notes
Low-noise op-amps like LM833 or JRC5532 can be used. Ferrite beads can be replaced with 0-ohm resistors. Test pads JPR12/JPR13 are omitted, and the unused PLL chip (U100) remains non-functional in the design.
4Programmable Components
The 1MB sample ROM (IW78C21M1) can be replaced with a programmed 27C800 chip. The 93C66 EEPROM requires bit-order reversal when programming. The GAL chip is essential for IDE functionality.
5Design Limitations
No fabrication package has been created, and the board remains untested. Users build at their own risk. Isolation cuts in analog/digital power planes reduce crosstalk between supplies.
6Retro Hardware Legacy
This project preserves historic sound card technology while offering customizable open-source solutions. It serves as a technically detailed reference for electronics enthusiasts.
Original article: Hacker News (news.ycombinator.com) — Beavis Ultrasound PnP ISA Ses Kartı Replikası