Brainfuck computer on reed relays with Von-Neumann arch
Oh man.. Third attempt was successful and I painted six boards with solder mask. Currently I need to repeat this procedure for other 24 boards. But I already can start drill and mill boards and start assembling.
Current pallet I use for painting is not very good and I need another one to get more smooth surface.
Developed 2AND/2XOR module for carry-chain version of Adder. Just need to etch pcb's for it.
Failed first attempt of protection solder mask applying. I expected this.
I did this procedure long time ago last time.
Unfortunately my oven handles temperature with very big difference between the top and the bottom of oven. As a result - when two thirds of plate were successfully opened from mask top one third wasn't. Need to add little metal fan into oven for active convection.
Move out mask from all plates which I tried to do.
If second attempt would be failed too I will just milled boards and solder them without the mask.
Received memory board.. Oh man.. It look so cool. Need to start parts soldering. There are 16x16 led panels for this board. dimensions 300x200 mm.
Published an article about this board on Russian geek site geektimes.ru on the first of April. That was very good idea - My article was very popular this day.
And as a result - someone in comments gave me advice how to optimize adder schematic and reduce relays for it from 256 to just 112! It's the whole block! Carry chain - is very good idea for this project.
Here is schematic:
There is an error near K4 - contacts are reversely connected. So instead of 32 modules with 3 different types (ADD+C, 2AND/2OR, 5AND) I just need 32 modules with one type! 2AND/2XOR
Will create schematic and routing for this module in nearest future.
Done with etching 30 pcb plates! 8 different types. Now working on photomask.
I'm done with Memory Board and send it to manufacture. It comes back to me at the beginning of April and I will start assemble it
Here is 3D view with all parts (yes, it's 16x16 led panels on the top):
I routed almost all modules:
ADD+Carry module, D-trigger module, 5AND, 2AND/2OR module, base board and working on memory module
Currently I'm working on making pcb's - I'm doing all pcb by myself using photoresist technology.
I already etched 17 of 26 panels 20x15 cm - each panel contain 9 modules and 4 relays on each module. When I finished etching I will start with solder mask.
6 pcb's - D-trigger,
2 pcb's - ADD+C
3 pcb's 2AND/2OR
5 pcb's - base panel each for 32 modules. I need one more of this type
1 pcb's 5AND - I need 4 of them for paralle carry.
I created roadmap webpage in github repository where I update all steps