This vintage user manual is a rare find for Intel enthusiasts. The UPI-41 Universal Peripheral Interface is a remarkable piece of engineering history. This manual is a must-have for collectors and vintage computing aficionados alike. Whether you're a seasoned Intel user or new to the vintage computing scene, this manual is a valuable resource for understanding the UPI-41. Don't miss your chance to add this piece of history to your collection. Click HERE to check out my other items!