The Winbond W82C476-80 is a single-chip enhanced PC/AT I/O controller. It integrates many of the common functions found in an IBM PC/AT compatible system, reducing component count and system cost. This chip is a vital part of legacy PC systems, handling essential input/output operations.

Applications:

• Legacy PC/AT compatible motherboards
• Embedded systems requiring PC/AT I/O functionality
• Industrial control systems with ISA bus architectures

Features:

• Floppy disk controller (FDC) supporting up to four 3.5" or 5.25" floppy disk drives
• Two serial ports (UARTs) with independent baud rate generators
• One parallel port supporting SPP, EPP, and ECP modes
• IDE interface supporting two IDE devices
• Real-time clock (RTC) with CMOS RAM
• Keyboard controller interface
• Interrupt controller with support for IRQ0-IRQ15
• DMA controller with support for DMA channels 0-7
• Timers/Counters

Benefits:

• Reduced component count and system cost
• Simplified system design
• Enhanced system reliability
• Compatibility with industry-standard PC/AT peripherals
• Provides necessary functions for legacy hardware support.

Additional Details:

The W82C476-80 operates at 8 MHz. It typically uses a 16-bit ISA bus interface. It requires a 5V power supply. The chip is commonly found in PQFP or DIP packages. It provides full backwards compatibility for older PC applications and hardware.