LCD PCB - Making an 8 Bit pipelined CPU - Part 94

I'm not planning on the LCD module making it to the final configuration of my build, but in many ways this video makes the LCD the first sub component to achieve "completed" status. I take the schematic work from Part 93 and design a PCB to drive the LCD. I also design and 3dprint a support.

0:00 Introduction
0:48 PCB Design
4:15 Soldering
9:22 Cad
13:22 Assemble
14:08 Finish and Test

I'm waiting on a delivery before I can complete the final module in the ALU but I wanted to do this anyway so we'll have a moment when the CPU is entirely PCB.

I have experienced some glitches on the enable line which I cleaned up with a low value (1nf) cap, I'll investigate this a bit more when I get some time and maybe report back.

[jerril]

Thanks James. It looks great. Reliability in testing apparatus can save a lot of frustration. That was a fun, as usual. Take care.

[dipakpatel-gzgv]

Hope you build this as a kit, wonderful job

[OscarSommerbo]

James, for your convenience and my sanity. Start soldering the lowest/smallest passives first, then finish off with the ICs, unless there is a clearance issue. But generally the smaller components will not get in the way.

[azyfloof]

That's a nice LCD module, nice design! 😃
I just thought of something, and perhaps you've had similar ideas, but if you made a cartridge module for the EEPROM, you can write programs, games etc and have swappable cartridges 😍
You could also have a kind of bootload ROM and write the initialisation routines for the LCD etc onto that

[TheDThought]

Thanks for the fabulous series. I finished yesterday binge-watching your whole process over a course of about 10 days, it was very interesting, teaching and even entertaining.

I'm very keen on seeing what you're up to for providing a VGA output.
Somehow i've got the feeling it'll be far beyond what BenEater has done. (even sprites might be possible on a breadboard...)

[edgeeffect]

This is approaching a landmark point of having no breadboards... looking forward to seeing you "spoil" it all again with more breadboards soon. ;)

[AiOinc]

Looks great by comparison, makes definitely helps the look of the whole setup look less "Bodge-y"!
P.S. you spelled "ALU" wrong in your description

[AmauryJacquot]

the size you want to consider for the module itself is 98.5x60.5, as this is the max dimensions it is supposed to be. (those pesky ± notations are important)

[thmagistr]

Awesome job yet again. Seeing this series will soon come to a halt leaves me with mixed feelings. I am sad because it will end but happy because I will try to build the cpu myself. Any chance of making a kit ? Ordering in quantities should enable better prices and we don't have to throw 4-5 unused boards to the trash.

[vastrix]

Really interesting video, I liked the hand soldering as well as seeing your 3D pipeline, it would've been cool to see the printer actually print it tho :)

[twobob]

123 goodness, they dont make em like that anymore... :) nice bracket

[TheEmbeddedHobbyist]

If im gounding unused gates i like to run a short track away from the pin and then go to ground through a via (Via a via :) )
Then you can cut the track at a later date should you need it.

[harshchikorde]

Sir r u going to burn a small operating system code in memory for this cpu? If u r then I am so dam excited for this to happen.

[AJBK]

Would the display and PCB now class as a monitor?

[TrickyNekro]

You know the funniest of all is that I discovered your channel on Odysee... Youtube is really not making a service to the diy, hacker and moding community.

[AJBK]

Your 123d design still works?
mine didn't :(