56,966 blogs · [ { "id": "01a087d2-bc35-7290-affc-b006d14ad538", "title": "Calculating Pi", "url": "https://relaycomputer.co.uk/posts/2025/12/calculating-pi/", "published_at": "2025-12-01T08:00:00+00:00" }, { "id": "01a087d2-bc35-7290-affc-b006d1ea434c", "title": "Turing Completeness", "url": "https://relaycomputer.co.uk/posts/2025/03/turing-completeness/", "published_at": "2025-03-16T06:00:00+00:00" }, { "id": "01a087d2-bc35-7290-affc-b006d2a964a9", "title": "Controller Design: LOAD, STORE & INCXY Instructions", "url": "https://relaycomputer.co.uk/posts/2025/03/controller-load-store-incxy-design/", "published_at": "2025-03-09T06:00:00+00:00" }, { "id": "01a087d2-bc36-733c-9c0f-755f50e4c378", "title": "Controller Design: MOV8, MOV16 & MISC Instructions", "url": "https://relaycomputer.co.uk/posts/2022/12/controller-mov8-mov16-misc-design/", "published_at": "2022-12-05T06:00:00+00:00" }, { "id": "01a087d2-bc36-733c-9c0f-755f51a35e13", "title": "Assembling an assembler - token scanning", 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"id": "01a087d2-bc36-733c-9c0f-755f6225de06", "title": "More Laser Cut Parts", "url": "https://relaycomputer.co.uk/posts/2017/08/more-laser-cut-parts/", "published_at": "2017-08-06T12:13:00+00:00" }, { "id": "01a087d2-bc36-733c-9c0f-755f62f44adf", "title": "Incrementer Design", "url": "https://relaycomputer.co.uk/posts/2017/07/incrementer-design/", "published_at": "2017-07-17T20:34:00+00:00" }, { "id": "01a087d2-bc36-733c-9c0f-755f63221aaf", "title": "Incrementer Design: 16-bit Half Adder", "url": "https://relaycomputer.co.uk/posts/2017/07/incrementer-design-16-bit-half-adder/", "published_at": "2017-07-15T13:57:00+00:00" }, { "id": "01a087d2-bc36-733c-9c0f-755f63303e4d", "title": "Incrementer Design: 1-bit Half Adder", "url": "https://relaycomputer.co.uk/posts/2017/06/incrementer-design-1-bit-half-adder/", "published_at": "2017-06-04T21:42:00+00:00" }, { "id": "01a087d2-bc36-733c-9c0f-755f642a0ead", "title": "Register Design: Program Counter", "url": 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Registers Full Test", "url": "https://relaycomputer.co.uk/posts/2014/05/register-construction-completed-b-and-c/", "published_at": "2014-05-26T08:59:00+00:00" }, { "id": "01a087d2-bc37-71d1-9229-ffc6c360b3ab", "title": "Register Construction: B and C 8-bit Registers", "url": "https://relaycomputer.co.uk/posts/2014/05/register-construction-b-and-c-8-bit/", "published_at": "2014-05-24T16:23:00+00:00" }, { "id": "01a087d2-bc37-71d1-9229-ffc6c3b7517c", "title": "Register Design: B and C 8-bit Registers", "url": "https://relaycomputer.co.uk/posts/2014/05/register-design-b-and-c-8-bit-registers/", "published_at": "2014-05-11T09:08:00+00:00" }, { "id": "01a087d2-bc37-71d1-9229-ffc6c414f40b", "title": "Enclosure Update: Magic Pen", "url": "https://relaycomputer.co.uk/posts/2014/05/enclosure-update-magic-pen/", "published_at": "2014-05-10T08:46:00+00:00" }, { "id": "01a087d2-bc37-71d1-9229-ffc6c45a407c", "title": "Enclosure Update: Fitting of Laser Cut Parts", "url": "https://relaycomputer.co.uk/posts/2014/05/enclosure-update-fitting-of-laser-cut/", "published_at": "2014-05-05T10:03:00+00:00" }, { "id": "01a087d2-bc37-71d1-9229-ffc6c4997b98", "title": "Enclosure Update: Laser Cut Parts Arrived", "url": "https://relaycomputer.co.uk/posts/2014/05/enclosure-update-laser-cut-parts-arrived/", "published_at": "2014-05-03T08:49:00+00:00" }, { "id": "01a087d2-bc37-71d1-9229-ffc6c522e225", "title": "Register Design: Dual Output 8-bit Register", "url": "https://relaycomputer.co.uk/posts/2014/04/register-design-dual-output-8-bit/", "published_at": "2014-04-24T21:56:00+00:00" }, { "id": "01a087d2-bc37-71d1-9229-ffc6c556cee9", "title": "Register Design: A and D 8-bit Registers", "url": "https://relaycomputer.co.uk/posts/2014/04/register-design-and-d-8-bit-registers/", "published_at": "2014-04-20T10:15:00+00:00" }, { "id": "01a087d2-bc37-71d1-9229-ffc6c5bbda90", "title": "Register Design: General Purpose 8-bit Register", "url": "https://relaycomputer.co.uk/posts/2014/04/register-design-general-purpose-8-bit/", "published_at": "2014-04-16T21:08:00+00:00" }, { "id": "01a087d2-bc37-71d1-9229-ffc6c6b64ccd", "title": "Enclosure Update: Laser Cutting", "url": "https://relaycomputer.co.uk/posts/2014/04/enclosure-update-laser-cutting/", "published_at": "2014-04-10T18:58:00+00:00" }, { "id": "01a087d2-bc37-71d1-9229-ffc6c722e768", "title": "Completed ALU", "url": "https://relaycomputer.co.uk/posts/2014/03/completed-alu/", "published_at": "2014-03-30T11:15:00+00:00" }, { "id": "01a087d2-bc38-72ff-bfed-635ac3fc5cea", "title": "ALU Construction: Completed Backplane", "url": "https://relaycomputer.co.uk/posts/2014/03/alu-construction-completed-backplane/", "published_at": "2014-03-26T21:57:00+00:00" }, { "id": "01a087d2-bc38-72ff-bfed-635ac4ba21c3", "title": "Enclosure Initial Construction", "url": "https://relaycomputer.co.uk/posts/2014/03/enclosure-initial-construction/", "published_at": "2014-03-22T00:08:00+00:00" }, { "id": "01a087d2-bc38-72ff-bfed-635ac54a0330", "title": "ALU Construction: Completed Control Card Full Test", "url": "https://relaycomputer.co.uk/posts/2014/03/alu-construction-completed-control-card/", "published_at": "2014-03-16T08:59:00+00:00" }, { "id": "01a087d2-bc38-72ff-bfed-635ac568a6f0", "title": "ALU Construction: Control Card Power Rails & Wire Wrap", "url": "https://relaycomputer.co.uk/posts/2014/03/alu-construction-control-card-power/", "published_at": "2014-03-14T19:51:00+00:00" }, { "id": "01a087d2-bc38-72ff-bfed-635ac6311295", "title": "ALU Construction: Control Card Header Pins & Relay Sockets", "url": "https://relaycomputer.co.uk/posts/2014/03/alu-construction-control-card-header/", "published_at": "2014-03-04T18:03:00+00:00" }, { "id": "01a087d2-bc38-72ff-bfed-635ac65365e4", "title": "Enclosure Disclosure", "url": "https://relaycomputer.co.uk/posts/2014/03/enclosure-disclosure/", "published_at": "2014-03-01T10:55:00+00:00" }, { "id": "01a087d2-bc38-72ff-bfed-635ac6f1750f", "title": "ALU Construction: Completed Arithmetic Card Full Test", "url": "https://relaycomputer.co.uk/posts/2014/02/alu-construction-completed-arithmetic/", "published_at": "2014-02-23T17:31:00+00:00" }, { "id": "01a087d2-bc38-72ff-bfed-635ac72af8ad", "title": "ALU Construction: Arithmetic Card Wire Wrap 2", "url": "https://relaycomputer.co.uk/posts/2014/02/alu-construction-arithmetic-card-wire_19/", "published_at": "2014-02-19T22:37:00+00:00" }, { "id": "01a087d2-bc38-72ff-bfed-635ac7ac5d49", "title": "ALU Construction: Arithmetic Card Wire Wrap 1", "url": "https://relaycomputer.co.uk/posts/2014/02/alu-construction-arithmetic-card-wire/", "published_at": "2014-02-16T10:04:00+00:00" }, { "id": "01a087d2-bc38-72ff-bfed-635ac853b26c", "title": "Sketchy Diversion", "url": "https://relaycomputer.co.uk/posts/2014/02/sketchy-diversion/", "published_at": "2014-02-04T19:10:00+00:00" }, { "id": "01a087d2-bc38-72ff-bfed-635ac89af24d", "title": "ALU Construction: Arithmetic Card Power Rails", "url": "https://relaycomputer.co.uk/posts/2014/01/alu-construction-arithmetic-card-power/", "published_at": "2014-01-26T23:26:00+00:00" }, { "id": "01a087d2-bc38-72ff-bfed-635ac944e336", "title": "ALU Construction: 1-bit Arithmetic Full Construction", "url": "https://relaycomputer.co.uk/posts/2014/01/alu-construction-1-bit-arithmetic-full/", "published_at": "2014-01-21T18:25:00+00:00" }, { "id": "01a087d2-bc38-72ff-bfed-635ac9b68757", "title": "ALU Construction: Arithmetic Card Relay Sockets", "url": "https://relaycomputer.co.uk/posts/2014/01/alu-construction-arithmetic-card-relay/", "published_at": "2014-01-17T23:23:00+00:00" }, { "id": "01a087d2-bc38-72ff-bfed-635aca1cdf56", "title": "ALU Construction: Arithmetic Card Header Pins", "url": "https://relaycomputer.co.uk/posts/2014/01/alu-construction-arithmetic-card-header/", "published_at": "2014-01-06T22:18:00+00:00" }, { "id": "01a087d2-bc38-72ff-bfed-635aca3e7ce8", "title": "ALU Construction: Completed Logic Card Full Test", "url": "https://relaycomputer.co.uk/posts/2013/12/alu-construction-completed-logic-card/", "published_at": "2013-12-18T08:26:00+00:00" } ] posts Claim your blog

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2025

Calculating Pi original ↗

1 Dec 2025

Turing Completeness original ↗

16 Mar 2025

Controller Design: LOAD, STORE & INCXY Instructions original ↗

9 Mar 2025

2022

Controller Design: MOV8, MOV16 & MISC Instructions original ↗

5 Dec 2022

Assembling an assembler - token scanning original ↗

27 Nov 2022

Tick Tock original ↗

20 Nov 2022

Back to Backplanes original ↗

5 Nov 2022

Assembling an assembler - overview original ↗

14 May 2022

Intermission original ↗

2 May 2022

2020

2020 Update original ↗

1 Feb 2020

Decoder Construction original ↗

5 Jan 2020

2019

Decoder Design: Schematic & PCBs original ↗

22 Dec 2019

Controller Construction original ↗

21 Dec 2019

Controller Design: Schematic & PCBs original ↗

20 Dec 2019

Controller Design: ALU, MOV8 & SETAB Instructions original ↗

7 Dec 2019

Controller Design: GOTO Instruction original ↗

30 Nov 2019

Sequencer Construction original ↗

20 Nov 2019

Sequencer Design: Schematic & PCBs original ↗

11 Nov 2019

Sequencer Design: Pulse Distribution original ↗

2 Nov 2019

Sequencer Design: 24-cycle FSM original ↗

1 Nov 2019

Branching: Opcode Timing original ↗

6 Oct 2019

Branching: Opcode Design original ↗

23 Sept 2019

16-bit Register PCB Design original ↗

9 Aug 2019

16-bit Register Design original ↗

15 Jul 2019

Making a PCB original ↗

4 Mar 2019

A change of approach original ↗

14 Jan 2019

Procrastination is the thief of time original ↗

6 Jan 2019

2018

Auxiliary Control Construction original ↗

27 Mar 2018

Auxiliary Control Design (Part 3 of 3)original ↗

7 Feb 2018

Auxiliary Control Design (Part 2 of 3)original ↗

29 Jan 2018

Auxiliary Control Design (Part 1 of 3)original ↗

24 Jan 2018

Fetch and Increment - Construction and Test original ↗

16 Jan 2018

Incrementer Test original ↗

7 Jan 2018

2017

Incrementer Construction (Part 2 of 2)original ↗

17 Dec 2017

Incrementer Construction (Part 1 of 2)original ↗

10 Dec 2017

Memory Test original ↗

30 Nov 2017

Memory Construction (Part 2 of 2)original ↗

25 Nov 2017

Memory Construction (Part 1 of 2)original ↗

19 Nov 2017

Program Counter Construction original ↗

11 Nov 2017

Miscellany Special: Backplane X, Cable Routing and Address Bus original ↗

5 Nov 2017

Miscellany Special: Power Distribution original ↗

29 Oct 2017

Control Design: Fetch and Increment original ↗

17 Sept 2017

Memory Design (Part 2 of 2)original ↗

6 Sept 2017

Memory Design (Part 1 of 2)original ↗

3 Sept 2017

The problem with memory original ↗

18 Aug 2017

More Laser Cut Parts original ↗

6 Aug 2017

Incrementer Design original ↗

17 Jul 2017

Incrementer Design: 16-bit Half Adder original ↗

15 Jul 2017

Incrementer Design: 1-bit Half Adder original ↗

4 Jun 2017

Register Design: Program Counter original ↗

29 May 2017

2016

Yet another diversion original ↗

24 Jul 2016

Sequencing & Control Test original ↗

24 May 2016

W Backplane Construction & Power Distribution original ↗

11 Apr 2016

User Interface Construction: Instruction, Clock and Sequencer original ↗

29 Mar 2016

Controller Construction: MOV-8, ALU and SETAB original ↗

1 Jan 2016

2015

Sequencer Construction: 8-cycle FSM original ↗

8 Jul 2015

Decoder Construction: MOV-8, ALU & SETAB original ↗

7 Jun 2015

Register Construction: Completed Instruction Register Full Test original ↗

16 May 2015

Register Construction: Instruction Register original ↗

9 May 2015

New Workbench original ↗

4 May 2015

User Interface Design: Instruction, Clock and Sequencer original ↗

8 Apr 2015

Control Design: MOV-8, ALU and SETAB (part 2 of 2)original ↗

4 Apr 2015

Control Design: MOV-8, ALU and SETAB (part 1 of 2)original ↗

31 Mar 2015

Pulse Distribution Design: Pulses C,D and E original ↗

22 Mar 2015

Sequencer Design: 8-cycle FSM original ↗

26 Jan 2015

Decoder Design: MOV-8, ALU & SETAB original ↗

4 Jan 2015

2014

Register Design: Instruction Register original ↗

1 Dec 2014

Sequencing & Control Design: Overview original ↗

19 Sept 2014

ALU & Registers A-D Test with new Display Cards original ↗

19 Aug 2014

User Interface: Display B Initial Design and Construction original ↗

20 Jul 2014

User Interface: Display A Initial Design and Construction original ↗

12 Jul 2014

User Interface: Data Switches original ↗

5 Jul 2014

Register Construction: Completed A and D 8-bit Registers Full Test original ↗

28 Jun 2014

Register Construction: A and D 8-bit Registers original ↗

22 Jun 2014

Register Construction: Completed B and C 8-bit Registers Full Test original ↗

26 May 2014

Register Construction: B and C 8-bit Registers original ↗

24 May 2014

Register Design: B and C 8-bit Registers original ↗

11 May 2014

Enclosure Update: Magic Pen original ↗

10 May 2014

Enclosure Update: Fitting of Laser Cut Parts original ↗

5 May 2014

Enclosure Update: Laser Cut Parts Arrived original ↗

3 May 2014

Register Design: Dual Output 8-bit Register original ↗

24 Apr 2014

Register Design: A and D 8-bit Registers original ↗

20 Apr 2014

Register Design: General Purpose 8-bit Register original ↗

16 Apr 2014

Enclosure Update: Laser Cutting original ↗

10 Apr 2014

Completed ALU original ↗

30 Mar 2014

ALU Construction: Completed Backplane original ↗

26 Mar 2014

Enclosure Initial Construction original ↗

22 Mar 2014

ALU Construction: Completed Control Card Full Test original ↗

16 Mar 2014

ALU Construction: Control Card Power Rails & Wire Wrap original ↗

14 Mar 2014

ALU Construction: Control Card Header Pins & Relay Sockets original ↗

4 Mar 2014

Enclosure Disclosure original ↗

1 Mar 2014

ALU Construction: Completed Arithmetic Card Full Test original ↗

23 Feb 2014

ALU Construction: Arithmetic Card Wire Wrap 2 original ↗

19 Feb 2014

ALU Construction: Arithmetic Card Wire Wrap 1 original ↗

16 Feb 2014

Sketchy Diversion original ↗

4 Feb 2014

ALU Construction: Arithmetic Card Power Rails original ↗

26 Jan 2014

ALU Construction: 1-bit Arithmetic Full Construction original ↗

21 Jan 2014

ALU Construction: Arithmetic Card Relay Sockets original ↗

17 Jan 2014

ALU Construction: Arithmetic Card Header Pins original ↗

6 Jan 2014

2013

ALU Construction: Completed Logic Card Full Test original ↗

18 Dec 2013