# CPU8 Plus — Advanced Version of CPU8 > Educational 8-bit computer simulator with expanded memory for learning computer internals. (iPhone/iPad app by Cordova Bay Entertainment Group, Inc.) - Source: https://appshunter.io/ios/app/cpu8-plus/id1518324298 (this page in markdown: same URL + `.md`) - Developer: [Cordova Bay Entertainment Group, Inc](https://appshunter.io/developer/1448776027) - Category: Education, Reference - Price: Free - Rating: 5.00/5 from 5 App Store ratings - Age rating: 4+ - Requires: iOS 12.4 · 160 MB - Languages: English - Released: 2020-06-25 - Data updated: 2026-06-06 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/cpu8-plus/id1518324298/reviews.md ## What is CPU8 Plus? CPU8Plus is an updated extension of the basic CPU8 App. Most of the extensions deal with the amount of ‘memory’ available for programs within this little 8-bit computer. CPU8 teaches the user how computers work internally. It does this with a simple instruction set of just 16 instruction along with an 8-bit bus; two 8-bit registers; an 8-bit ALU; 8-bit storage word but only provides 4-bit addresses (that is 4-bit Program Counter and 4-bit Address Register) limiting the addressable memory space to just 16 bytes (or words). CPU8Plus adds 4-bits to the address space via a new 8-bit Program Counter and Address Register. This is a major upgrade that provides 256 bytes (or words) of address space for programs and data — 16 times that of CPU8. To facilitate this change, the microcode now decides if an instruction is a 1 or 2 word instruction and advances the PC accordingly while utilizing the larger space for the operand that has doubled from 4 bits to 8 bits. The CPU8Plus model provides these changes and the assembler now generates new executable object code to reflect these changes. This is all done while maintaining source code compatibility. That means users of CPU8 can cut their source code from CPU8 and paste it into new files on CPU8Plus, assemble and run without any other changes. A common goal in the computer world. Programs can be significantly more complex, however, since they can now be 16 times bigger. Documentation has also been updated along with some history background. Most progress displays are now reported in hexadecimal rather than binary which has become too unwieldy. A separate “memory” display displays contents of the full 256 bytes. Hopefully, this will enhance the learning process for you and provide new information about how computers work! Suitable for classroom study, independent study or just for the sheer enjoyment of playing with a computer that you can watch and learn from. No individual information is accessed. ## Key features - Simulates 8-bit computer architecture - Expanded addressable memory (256 bytes) - Simple 16-instruction set - Source code compatibility with CPU8 - Hexadecimal progress displays - Detailed memory display ## Frequently asked questions about CPU8 Plus ### What is CPU8 Plus? CPU8 Plus is an educational application that simulates an 8-bit computer. It helps users understand internal computer operations by providing a simplified model with a limited instruction set and memory. ### How does CPU8 Plus help users learn about computers? It teaches users how computers work internally by demonstrating concepts like instruction sets, registers, ALU, and memory addressing. The expanded memory in CPU8 Plus allows for more complex programs than its predecessor, enhancing the learning process. ### What are the key improvements in CPU8 Plus over CPU8? CPU8 Plus significantly expands the addressable memory space to 256 bytes from 16 bytes in CPU8. This is achieved through an 8-bit Program Counter and Address Register, enabling larger and more complex programs. ### Is CPU8 Plus suitable for beginners? Yes, CPU8 Plus is designed for classroom study, independent learning, or enjoyment. Its simple instruction set and clear simulation make it accessible for those new to computer architecture. ### Can I use my old CPU8 programs with CPU8 Plus? Yes, CPU8 Plus maintains source code compatibility with CPU8. You can cut and paste your CPU8 source code into new files on CPU8 Plus, assemble, and run them without modifications. ### What is the age rating for CPU8 Plus? CPU8 Plus has an age rating of 4+, making it suitable for a wide range of users, including younger learners interested in technology. ### How often is CPU8 Plus updated? The latest version is 2.10, and it was last updated on September 18, 2024. This indicates a commitment to ongoing development and improvements. ### Does CPU8 Plus have ads? No, CPU8 Plus does not contain advertisements. It is a free application focused purely on the educational simulation experience. ## Version history (last 5 releases) ### 2.10 — 2024-09-18 CPU Engine Updates. New History Section: Input/Output Peripherals. Visual Improvements plus bug fixes. ### 2.9 — 2024-05-29 Added progress display for Flags New History Sections: Human Computers & Computers And Numbers. Additional information is History timeline adding key developments in 2024. Updated credits, copyright and general housekeeping. Visual Improvements plus bug fixes. ### 2.8 — 2023-10-31 Updated History Time Line 2022 and added History Time Line 2023 Updates and improvements ### 2.7 — 2023-06-04 Added new History section entitled: Artificial Intelligence & Machine Learning plus misc updates and improvements. ### 2.6 — 2023-02-21 History now features a section on Copyrights and Patents. Misc improvements, enhancements and fixes. ## Apps similar to CPU8 Plus | App | Rating | Price | Category | | --- | --- | --- | --- | | [CPU8](https://appshunter.io/ios/app/cpu8/id1448776028) | 4.7 (14) | Free | Education | | [Cartesian graph coordinates](https://appshunter.io/ios/app/cartesian-graph-coordinates/id6449740813) | 5.0 (1) | Free | Education | | [Litany Language Learning](https://appshunter.io/ios/app/litany-language-learning/id1568627189) | 4.7 (29) | Free | Education | | [ITCA Data Science Fundamentals](https://appshunter.io/ios/app/itca-data-science-fundamentals/id6740096243) | — | Free | Education | | [Learn Estonian - EuroTalk](https://appshunter.io/ios/app/learn-estonian-eurotalk/id325531432) | 5.0 (1) | $7.99 | Education | | [Kini](https://appshunter.io/ios/app/kini/id1518353816) | — | Free | Education | ## More apps by Cordova Bay Entertainment Group, Inc - [CPU8](https://appshunter.io/ios/app/cpu8/id1448776028) - [CPU8 Pro](https://appshunter.io/ios/app/cpu8-pro/id1604002192) All apps by Cordova Bay Entertainment Group, Inc: https://appshunter.io/developer/1448776027 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-06.*