CPU8 Plus 2.10 - App Store

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About 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...

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.

Version History CPU Engine Updates. New History Section: Input/Output Peripherals. Visual Improvements plus bug fixes. 2.10 09/18/2024 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. 2.9 05/29/2024 Updated History Time Line 2022 and added History Time Line 2023 Updates and improvements 2.8 10/31/2023 Added new History section entitled: Artificial Intelligence & Machine Learning plus misc updates and improvements. 2.7 06/04/2023 History now features a section on Copyrights and Patents. Misc improvements, enhancements and fixes. 2.6 02/21/2023 Misc updates and improvements. 2.5.1 10/26/2022 Support for iOS 16 and iPadOS 16. Enhanced support for iPhone 14 Pro and iPhone Pro Max 2.5 09/20/2022 Enhancements and bug fixes. Memory popup display enhanced for iPhones with extended display for iPads (with ASCII). Replaced History sections dealing with Encryption, VNET, Artificial Intelligence and Robots Added new History section called: Gaffes, Mistakes, Errors & Blunders. 2.4 08/09/2022 New History Section with introduction to Magnetic Amp computers of the early to mid-1900s. General bug fixes and improvements. 2.3 05/25/2022 Enhancements and bug fixes. 2.2 03/21/2022 Enhancements to Settings and instruction tracing, History section updates and several other small general improvements in this release update. 2.1 12/29/2021 Cleaned up Assembly output regarding single byte instructions. New History section covering Office Automation. Support for iPhone 13 models and 6th generation iPad. Implemented a cleaner overall display presentation along with several small general improvements. 2.0 09/30/2021 Additional background on IBM VM and VNET in History section. Misc fixes and improvements. 1.7 08/03/2021 Assembler now supports standard math operands such as "((2+8)*25+5)" in many instructions. Hexadecimal, binary and decimal numbers can be used in these operands. A new user provided example application is included to calculate Factorials. Plus miscellaneous improvements and bug fixes. 1.6 05/12/2021 Additional History sections: Section: Security, Encryption, Ciphers, Codes and Certificates Section: Robots, Droids And Other Automatons Section: Artificial Intelligence And Machine Learning Enhanced support for M1 equipped Macs with larger screens. Bug fixes and readability improvements 1.5.1 02/18/2021 There are new history sections in this release covering security, robotics and artificial intelligence. Plus, this release contains enhanced screen management for M1 powered Macs along with general bug fixes. 1,5 02/16/2021 Small improvements in this release, plus support for MacOS Big Sur with Apple Silicon! 1.4 11/16/2020 Improvements in this update include enhancements, bug fixes and support for the iPad Air 4 and the various new iPhone 12 models. 1.3 10/22/2020 Support of iPad Air generation 4 plus other minor enhancements, bug fixes and improvements... 1.2 09/27/2020 Small enhancements and improvements. 1.1 07/29/2020 1.0 06/25/2020

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Previous Versions

Here you can find the changelog of CPU8 Plus since it was posted on our website on 2023-09-06 19:05:51. The latest version is 2.10 and it was updated on 2026-06-24 13:33:43. See below the changes in each version.

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