#85uino #DWMC85uino

Well... I think I need to order Revision 3 of the 85uino board I made... Mixed up some signals, so that the USR LED and the USR button were on the same pin at the same time.

And since the USR button is active low, that meant that the USR LED was on the entire time, with the PWR LED. Not good.

At the same time, I had problems soldering the 74LVA1G139 in it's VSSOP-8 package. Too much solder paste, which meant that two pins were bridged. And I was unable to unbridge them. I simply couldn't get anything between the pins in question. With a 0.5mm gap you can't really use a 1.5mm wick. Rosin and more solder didn't work either.

On the other hand, I took the time to design the circuit for an extension memory and bus module, with space for 32k of RAM and four extension modules, which I plan to order with the next revision of the 85uino board.

And... Plans for the DWMC-85 Max are taking shape, with planned bank switched 128k Flash and 512k RAM.

And now, I have created a gitlab repo for the DWMC 85uino Project.

It contains the hardware and, currently, just some boiler plate for the monitor program, with just constants and setting of interrupt vectors.

https://gitlab.com/dwmc-main/dwmc-85uino/85uino/

#DWMC85uino #85uino #DWMC #i8085 #hardwareproject #opensourcehardware

DWMC Main / DWMC 85uino / 85uino · GitLab

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