Programming volatile memory boards in older Icom Rigs and radio upgrades

[hostile]

I just suggested additions that will turn this version into a functional analogue of the original "icom EX-428 ram writer" programmer.

And good suggestions if someone would use them,  do you have an atmega to test? I could add the extra features in the code, but behind on work and would be a while for me to setup hardware to demo the LEDs and toggles switches.  would probably make it separate from this code so others could still run it on the smaller Arduino versions.  I added your supplied firmware as RAM14. 

[Mildi]

Thank you.
I'm sure my fellow radio amateurs will like it.
And your work will be in demand, and people will thank you.

[hostile]

Updated 8/22/2022
Had an issue with the way I was pulling ram data from the program memory space

Here is a standalone version that I tested the additional inputs with digital IO controller.
4 pins for RAM selection, 3 LEDs (Programming, Pass, Fail)
1 Button to start programming, can still be controlled and viewed output in console.
https://youtu.be/Zlx7NylAdQw

[Mildi]

Thanks a lot!
Ideal!
Already ordered a breadboard for installation on 2560.
When I return from a business trip, I will repeat the apparatus.
According to Murphy's law, the Icom battery runs out when there is no PC nearby to flash it...

[rz]

I had made a programmer based on Arduino Uno.

https://www.eevblog.com/forum/rf-microwave/a-r71e-ram-board-programmer-based-on-arduino-uno/

https://github.com/bkbbk/ex314-programmer

[apollo2mond]

The 2K SRAM uPD446 can be replaced by FRAM (e.g. Ramtron FM1608) which is cheaply available from ebay.
The extra pins (p2/a12=vss, p27/we=p23, p28/vcc=p26/nc) as well as p23/a11=vss must be reconnected by hand.
In sum only 4 extra connections and no need for a battery in the future!

Also an eprom/ram solution which keeps the device configuration data at eprom is easily to build.

[Reddevil]

Hi Hostile, being new to Arduino, will the UNO board work in place of the MEGA that you are using. If can I  follow your pin Mega board pin out and use the same UNO pin out.

[hostile]

The earlier release should work with UNO.  The last release I posted breaks compatibility unless the extra IOs are removed.  Mega extra IOs for using a standalone device with out the serial monitor.   If not wanting to use those then you don’t need the extras.   The code is pretty well commented and all the pins are defined in the top.  If you have issues with https://www.eevblog.com/forum/rf-microwave/programming-volatile-memory-boards-in-older-icom-rigs/?action=dlattach;attach=1571059 then let me know and I will update the last one posted to work with UNO.  Used it mostly for 745 and 751.