SD Card System.
This is a two board system that provides a very inexpensive, flexible, and long-lasting storage option for our KIM Clone , SS-50 based designs, or almost any third party system.
The main board is the Corsham SD Shield. It plugs into an Arduino Mega and provides for insertion of a micro SD card, and also includes a DS3231 based real time clock (RTC). The Arduino does the hard work of providing an interface between the host processor (6502, 6800, 6809, etc) and the SD card and RTC. It connects to the host via a ribbon cable.
The board also contains three LEDs used for status, a RESET switch, a four position DIP switch, a DS3231 RTC, backup battery, and it maintains the Arduino Mega headers so additional shields can be placed on top. Since the source code is available you can add additional drivers for whatever shields you add. Want to add an LCD shield that displays which files are mounted? Just plug in the shield and modify the user interface class in the source code. Only one of the DIP switches has a defined purpose, so the rest are free for you to add your own logic.
The protocol between the host and the SD Card System is completely defined in The Remote Disk Protocol Guide available for download below.
The source for the Arduino Mega is also available for download.
|SD Card System manual|
|SD Card Schematic|
|SD drive Arduino November 2020 source|
|SD shield tester, set RTC time source Arduino|
|The Remote Disk Protocol Guide|
|6502 routines for KIM-1 low and high-level disk access
Also see xKIM extended KIM Monitor
The late Andrew Jacobs set up a web site with relevant 6502 information. It is lost now. This site is reproduced here...
https://www.youtube.com/watch?v=FY4wjTuzkM8 1979 - Educational trainers Educational instruments division was the...
Tiny Basic Tom Pitman's Tiny basic. Small enough to fit in the 1K KIM-1, yet a real Basic interpreter Ti...
1977 01 Tiny Basic a mini language for your micro 1977 01 What's that Digital Group Really Doing ...