The CDP1804ACD is an IC component designed by RCA Corporation. It is a microprocessor integrated circuit that was first introduced in the 1970s. The chip is primarily used for general-purpose computing applications and is based on the COSMAC architecture.
Here are some key features of the CDP1804ACD:
1. Architecture: The CDP1804ACD is a 4-bit microprocessor with an 8-bit data bus. It operates using a single-phase clock, making it relatively simple to integrate into various systems.
2. Clock Speed: The chip has a clock speed of up to 1.76 MHz, allowing for decent processing capabilities given its vintage era.
3. Instruction Set: The CDP1804ACD has a compact instruction set, consisting of 58 (5-bit) instructions. This simplicity makes it ideal for small-scale computing tasks.
4. Memory: The chip supports up to 1 kilobyte of external memory through its addressing capabilities. This memory can be both RAM and ROM, allowing for programmable and non-volatile storage options.
5. Input/Output: The CDP1804ACD has general-purpose input/output (I/O) pins that can be configured for various interfacing needs, making it adaptable to different system requirements.
6. Power Consumption: With a typical power consumption of around 200 mW, the CDP1804ACD is relatively low-power for its time. This feature made it suitable for portable and battery-powered devices.
7. Single Chip Solution: Unlike some contemporaries, the CDP1804ACD incorporates all major functions on a single chip, including the CPU, memory, and I/O, simplifying system design.
8. Packaging: The IC comes in a 40-pin dual in-line package (DIP), a popular package style during its era, making it compatible with existing board layouts.
9. Applications: The CDP1804ACD was widely used in various electronics applications, including early microcomputers, industrial control systems, electronic games, and automotive systems requiring minimal computing power.
10. Development Tools: RCA provided development tools and support for the CDP1804ACD, including assemblers, disassemblers, and simulators for easy programming and debugging.
It is important to note that while the CDP1804ACD was a pioneering microprocessor during its time, its capabilities and performance may be limited compared to modern processors. However, it remains an influential part of computing history, playing a role in the early development of embedded systems and paving the way for subsequent generations of microprocessors.
