Relay Computer

My journey in constructing an 8 bit relay computer from scratch ... made from of a ton of solder, wires, lights, relays, sweat, tears, swearing and money.

Control Design: Fetch and Increment

The design of the computer’s memory, incrementer and program counter are now complete but there’s one last piece of the ‘puzzle’ required to get the...

17 Sep 2017   —  5 minute read

Memory Design (Part 2 of 2)

In my last post I started the design for the computer’s memory unit which is spread over two cards. With the lower memory card design...

06 Sep 2017   —  5 minute read

Memory Design (Part 1 of 2)

In my last post I explained my decision to use a ‘modern’ memory chip in my relay computer … I also alluded to there being...

03 Sep 2017   —  7 minute read

The problem with memory

It’s time, at last, to start looking at the design for the computer’s memory and this is a bit of a game changer as it’s...

18 Aug 2017   —  5 minute read

More Laser Cut Parts

I’ve nearly got the design for the memory cards done and ready to share but once that’s out the way it’ll be time to get...

06 Aug 2017   —  3 minute read

Incrementer Design

In my last post I covered the design of the 16-bit half adder which takes whatever value is currently on the address bus and increments...

17 Jul 2017   —  3 minute read