New project: Repro Camputers Lynx

[stephen_usher]

Well, the secret is a secret no more... My new project is a reproduction Camputers Lynx.

IMG_5009.jpeg

PCBs remade by "The Board Folk" in dashing purple.

Unfortunately the ICs aren't labelled on the board and I don't have a BOM either, so that's the first part of the project to start on.

P.S. Found the Github site: https://github.com/Board-Folk/Camputers ... Lynx%20128

[PhilC]

@stephen_usher that's rather amusing. Considering I'm expecting a Lynx to be delivered today.ill send you some PCB photos to help you identify those chips once it arrives.

[rubber_jonnie]

Nice, looking forward to seeing your build 👍

[stephen_usher]

This evening I did an audit of chips relative to the BOM.

I'm in need of quite a few but thankfully all but the MC6845 are available from Mouser so I can do an order tomorrow. I can also add the inductors, variable resistor and variable capacitor to the list.

I can get on with starting installing all the sockets. I have enough stock of all of them, I think. Then I can do the resistors and ceramic caps.

Checking the board, the configuration using 4164 RAM won't need the -5V or 12V supply so I can just use a buck regulator and feed it either 9V or 12V to generate the +5V.

[peters]

I have 2 Lynx, my original 48k and a 96k I bought secondhand shortly after they went bust.

I should try to boot them up. The PSU should be checked.

[stephen_usher]

Chips, crystals, odd value ceramic caps and variable resistor & variable capacitor all now ordered.

[stephen_usher]

I have 2 Lynx, my original 48k and a 96k I bought secondhand shortly after they went bust.

I should try to boot them up. The PSU should be checked.

Yeah, the regulators could be a bit off and if the 4116 RAM doesn't get the full complement of voltages they can be damaged.

[rubber_jonnie]

There seems to be an interactive BoM on the github repo, I've added it here.

Just unzip it, I had to upload that way as html is not allowed as an upload. Attack vector apparently.

One gotcha I've had with these is that if you close your browser after placing parts you can run into issues with it forgetting what you've done, so yo may need to save after each use.

[rubber_jonnie]

I have 2 Lynx, my original 48k and a 96k I bought secondhand shortly after they went bust.

I should try to boot them up. The PSU should be checked.

Yeah, the regulators could be a bit off and if the 4116 RAM doesn't get the full complement of voltages they can be damaged.

4116 RAM - Shudders...

[stephen_usher]

4116 RAM - Shudders...

Thankfully the 128K/192K version uses 4164.