https://github.com/dadecoza/ardu14

An Arduino-Based Emulator for the Science of Cambridge MK14 Micro Computer
https://github.com/dadecoza/ardu14

Last synced: 10 days ago
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An Arduino-Based Emulator for the Science of Cambridge MK14 Micro Computer

• Host: GitHub
• URL: https://github.com/dadecoza/ardu14
• Owner: dadecoza
• License: mit
• Created: 2023-08-26T19:29:44.000Z (about 1 year ago)
• Default Branch: main
• Last Pushed: 2023-10-19T22:00:28.000Z (about 1 year ago)
• Last Synced: 2023-12-15T00:43:43.774Z (11 months ago)
• Language: C++
• Size: 8.12 MB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
## Ardu14: An Arduino-Based Emulator for the Science of Cambridge MK14 Micro Computer



This project is based on the "Portable MK14 emulator in 'C'". While I'm not certain of the exact origins, I discovered it in Doug Rice's [Virtual MK14](https://github.com/doug-h-rice/virtual_mk14) GitHub repository. [Doug](http://www.dougrice.plus.com/) and [Hein Pragt's](https://www.heinpragt.com/english/software_development/ins8060_or_scmp_processor.html) websites were valuable resources while working on this project.

### Dependencies

* [Keypad Library](https://www.arduino.cc/reference/en/libraries/keypad/)

* [SPI](https://www.arduino.cc/reference/en/language/functions/communication/spi/)

### Components

 * 1x Arduino Nano

 * 1x MAX7219 7-Segment display module

 * 21x 6x6mm Tactile switches

### Schematics

You can find the schematics [here](https://github.com/dadecoza/Ardu14/blob/main/Images/Schematic.png).

***NOTE:*** The schematics includes an optional speaker and resistor ... In future I would like to implement emulation of the Ferranti ZN425E DAC to produce sound.

### Programs

I have included the [example programs](https://github.com/dadecoza/Ardu14/tree/main/Programs) from the "[Mk14 Micro Computer Training Manual](https://www.heinpragt.com/download1/MK14%20Manual%20(later%20version).pdf)". For descriptions and start addresses, I'll direct you to [Doug's webpage](http://www.dougrice.plus.com/dev/seg_mk14.htm).

The [Message](https://github.com/dadecoza/Ardu14/blob/main/Programs/message.hex) program is loaded into memory on power on. You can run it be entering address ***0F20*** and pressing the ***Go*** button.

### Loading Programs

Ardu14 can accept Intel Hex files uploaded over the serial port at 9600 baud.



### Limitations / TODO

* SIO instructions have not been implemented yet. It would be cool to enable writing to the Arduino's serial port using the SIO instructions.

* Using the inexpensive 16x2 LCD might not have been the best choice, as it does not handle rapidly changing characters very well. For instance, the scrolling text of the "SC message" program or the flying ducks in "Duck Shoot". Turning the potentiometer to lower the contrast does help make it a bit more acceptable.

 ***EDIT:*** It have been pointed out by Retro Phil on the [Science of Cambridge MK14 Microcomputer & NatSemi SC/MP](https://www.facebook.com/groups/1330313924562216) facebook group, that using the OLED version of the 16x2 display should resolve the issue.

### PIC14

a Similar and popular PIC based emulator from Karen Orton can be found at [Karen's Corner](http://techlib.com/area_50/Readers/Karen/micro.htm).