Main Features
小尺寸PCI卡
通用PCI卡，适合3.3V 和5V PCI槽
24 TTL数字量I/O线
8255 PPI仿真模式0
缓冲电路提供高驱动能力
输出状态回读

Introduction
The PCI-1757UP is a 24-bit DI/O 1low profile PCI card. It meets the PCI standard REV.2.2 (universal PCI expansion card), and works with both 3.3V and 5V PCI slot. It provides users with 24 bits of parallel digital input/output, emulates mode 0 of the 8255 PPI chip, but the buffered circuits offer a higher driving capability than the 8255.