Writing Self Modifying Code for a 1980s Japanese Computer: Gakken FX Micro-Computer (FX-Micom R-165) скачать в хорошем качестве

Writing Self Modifying Code for a 1980s Japanese Computer: Gakken FX Micro-Computer (FX-Micom R-165)

The Gakken FX-System Microcomputer was released in Japan in 1981 (Showa 56) as the FX-Micom R-165. Extending the functionality of Gakken's popular educational EX-System electronic Denshi block concept, the FX Computer was powered by a Texas Instruments TMS1100 processor (or microcontroller). The kit was designed to expose children and beginners to assembly and machine language programming. Here, I explore the background, history, and programming of the R-165 using the English language edition, which was distributed in the UK by Electroni-Kit. Gakken Denshi Block EX-150 Electronics Kit:    • Denshi-Gakken Electroni-Kit EX-System - EX...   Busch Microtronic 2090 (TMS1600):    • Using a USB Logic Analyzer to Reverse Engi...   In 1985, the R-165 was repackaged by Tandy/RadioShack as the Science Fair Microcomputer Trainer. The Science Fair version made use of the familiar spring-terminal format of contemporary Radio Shack electronics kits. Curiously, this revision deemphasised the electronic circuits aspect in favour of the computer technology. RadioShack 1985 Catalogue Page: https://archive.org/details/radioshac... In 2009, Gakken released the GMC-4 as part of their Adult Science Mook (Magazine Book) series which emulated the functionality of the machine and uses the same instruction set. As part of the release, Gakken made the original Japanese user manual available. Gakken GMC-4 Mook: https://otonanokagaku.net/magazine/vo... R-165 Manual (Japanese): https://otonanokagaku.net/magazine/vo... In this video I show two programs. The first, a "Larson Scanner". Named for the TV producer, Glen Larson, who originated the bouncing LED pattern for both the Cylons in Battlestar Galactica and KITT in Knight Rider. Evil Mad Scientist Larson Scanner: https://wiki.evilmadscientist.com/Lar... Example of an LED Larson Scanner:    • Chasing Lights - LED SMD Surface Mount 555...   The second program is a Binary to Hexadecimal game, modelled on John Blankenbaker's Binary to Decimal program detailed in the Kenbak-1 Laboratory Exercise book (page 4-3). Kenbak-1 Demo (nanoKenbak-1):    • Programming the First Personal Computer: J...   Kenbak-1 Laboratory Exercises Book: https://adwaterandstir.com/wp-content... The R-165 has been emulated for a variety of platforms, including for the web using Scratch. FX-Micom R-165 (GMC-4, Science Fair Microcomputer Trainer) Emulator: https://scratch.mit.edu/projects/4677... You can use the two programs from this video by pasting the following into the "upload" text-box on the Scratch emulator (above). As the emulator sets memory sequentially from 00, the second program has been padded to ensure that it is loaded into the correct place. I've also included a jump (F40) at address 00 for use with simulators that do not allow the user to set the address of the program counter. ; "Larson Scanner" 81A1E1ECE2B1D6F04E1ECE2BFF11F02 ; Binary to Hexadecimal Game F400000000000000000000000000000000000000000000000000000000000000AE5994A54F4EE8ED0F50C0F4CE9F40C0 For an English language reference to the device, scans of the manual provided with the Science Fair Microcomputer Trainer are available online, along with my own interpretation of the "missing" Quick Reference Card. Science Fair Microcomputer Trainer Manual: https://archive.org/details/mct-28-260 Quick Reference Card: https://cdn.hackaday.io/files/1948768... You can write programs using the mnemonics and easily assemble them to the machine code instructions using an online assembler. The resulting code can be pasted directly into the above emulator, or can be entered by hand into other systems. You can also disassemble strings of machine code instructions back into readable mnemonics, which might be handy for figuring out how a program works. R-165 Assembler / Disassembler: https://arpruss.github.io/r165.html Additional documents referred to in the video: Reviews: Everyday Electronics, May 1983 (pp. 276-277): https://www.worldradiohistory.com/UK/... Hobby Electronics, October 1983 (pp. 16-17, 15): https://worldradiohistory.com/UK/Hobb... PCW Magazine, November 1983 (pp. 176-177, 243): https://worldradiohistory.com/UK/Pers... Gakken Adult Science Mook vol. 24: https://otonanokagaku.net/magazine/vo... Development of the R-165 (pg 76; translation): https://jsonj.co.uk/project/r165/oton... Photos of the R-165 Internals: https://jsonj.co.uk/project/r165/gakk... -- Errata: The commented page for the "binary to decimal game" shows the third mnemonic as AIY (Add Into Y), rather than AIA (Add Into A). The comment (A = A + 9) is correct, and the correct instruction is shown on the programming card and used on the device.