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The Z80SIO/2 is a Serial Input/Output Controller manufactured by Zilog. It is part of the Z80 family of microprocessors and peripheral chips.

Specifications:

• Manufacturer: Zilog
• Part Number: Z80SIO/2
• Type: Dual-channel serial communication controller
• Interface: Parallel (Z80 CPU bus compatible)
• Serial Communication: Full-duplex asynchronous/synchronous
• Baud Rate: Up to 1 Mbps (dependent on clock)
• Data Formats:
• Asynchronous: 5–8 bits/character, 1, 1.5, or 2 stop bits
• Synchronous: 5–8 bits/character, internal/external sync
• Interrupt Support: Z80-compatible vectored interrupts
• Clock Input: Single TTL-level clock (supports ×1, ×16, ×32, ×64 modes)
• Voltage Supply: +5V
• Package: 40-pin DIP (Dual In-line Package)

Descriptions:

• The Z80SIO/2 is a dual-channel serial communication controller designed for use with the Z80 microprocessor.
• It provides asynchronous (UART) and synchronous (USART) serial communication capabilities.
• Each channel operates independently, supporting modem control signals (RTS, CTS, DTR, DCD).
• Includes on-chip baud rate generation and FIFO buffering for efficient data handling.

Features:

• Dual independent serial channels
• Programmable baud rate generator
• Automatic CRC generation/checking (for synchronous mode)
• Modem control signals (RTS, CTS, DTR, DCD, RI)
• Z80 interrupt daisy-chain support
• Low-power CMOS version available (Z84C40)
• Wide operating temperature range (commercial/industrial versions)

This chip was widely used in early computer systems, industrial control, and telecommunications due to its flexibility and Z80 compatibility.