Request to support MB81C4256A-70P type RAM

[iosoft]

PLEASE support this MB81C4256A-70P type RAM ICs in this or a separate project.
It could be a separate project because no of pins are different.

These are mainly used for CGA/VGA ISA Display Cards as VRAM.
There is no tester in the market to test them except those expensive multi-IC testers.

PLEASE. NO HURRY.

[trevor-makes]

Sure, I have a couple M5M44256 256k x 4-bit DRAM that look compatible with these. I would do this as a separate project since the pinout is very different from the 1-bit DRAM. I think I can make it work with the same ATMega328p Arduino Nano though. I'll update you here when I have some time to hook up a breadboard prototype.

[iosoft]

Pls support both Arduino Nano and UNO.

Actually my Nano Clone is strange!
Even after upgrading the Bootloader, I face no issue uploading Blink example through Arduino IDE.
But, when uploading the code from VSCode+PlatformIO, the upload success rate is like 40%

Upload Failed....
Upload Failed....
Upload Failed....
Upload Success.

So, bought an original Arduino UNO and few Proto Shield.

[iosoft]

any update?

[trevor-makes]

Too many other projects currently! I'll take a crack at it next month.

[iosoft]

any update pls?

[trevor-makes]

Didn't get to it last month. I'll take a look at it next week.

[iosoft]

any update pls?

[trevor-makes]

@iosoft I haven't forgotten about it! I'm currently studying the Raspberry Pi Pico and am planning to port this project to that platform.

[iosoft]

@iosoft I haven't forgotten about it! I'm currently studying the Raspberry Pi Pico and am planning to port this project to that platform.

also, take help from ChatGPT coding.

[iosoft]

@iosoft I haven't forgotten about it! I'm currently studying the Raspberry Pi Pico and am planning to port this project to that platform.

just asking, why Raspberry Pi Pico?

[trevor-makes]

@iosoft I haven't forgotten about it! I'm currently studying the Raspberry Pi Pico and am planning to port this project to that platform.

just asking, why Raspberry Pi Pico?

The price is on par with ATmega and the PIO is capable of much faster I/O.