03 Sep 2017 - 8 min read
In my last post I explained my decision to use a ‘modern’ memory chip in my relay computer … I also alluded to there being some complexities in interfacing …
06 Aug 2017 - 4 min read
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 on with some construction again. …
17 Jul 2017 - 3 min read
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 it by one. To make this incremented …
15 Jul 2017 - 2 min read
Incrementer Design: 16-bit Half Adder
In the last post I introduced the design for the 1-bit Half Adder. This post covers connecting sixteen of these units together to make the 16-bit Half Adder. So, diving …
04 Jun 2017 - 3 min read
Incrementer Design: 1-bit Half Adder
Typical isn’t it?! … you wait 10 months for a post and then two come along at once. Well, all being well, this should be the first of a short flurry of posts as I …
29 May 2017 - 6 min read
Register Design: Program Counter
It’s been a while since my last post … pretty much 10 months in fact … and I’d love to say I’ve been quietly working on my relay computer in …
24 Jul 2016 - 2 min read
It’s been a bit quiet on the relay computer front again for a while … well it is summer after all and there’s no point staying inside the house tending to …
24 May 2016 - 2 min read
It’s finally time to give all the cards created so far a test so I can check everything works together as expected. This represents quite a bit of a milestone as the …
11 Apr 2016 - 3 min read
W Backplane Construction & Power Distribution
Before I can test the new decoder, sequencer and controller cards all working together with the rest of the computer I need to construct the ‘W’ backplane which …
29 Mar 2016 - 4 min read
User Interface Construction: Instruction, Clock and Sequencer
Well, the good news is I’ve just passed a major milestone in constructing this relay computer … it can now perform a single instruction in full firing the various …
01 Jan 2016 - 3 min read
Controller Construction: MOV-8, ALU and SETAB
So yea, it’s been a while since my last post … in fact it’s been just over six months. For some reason I decided I didn’t have enough to do in the …