22 Mar 2015 - 6 min read
Pulse Distribution Design: Pulses C,D and E
In my last post I covered the design of the 8-cycle finite state machine (FSM). In this post I’ll now take the outputs from that FSM and combine them to produce the …
26 Jan 2015 - 6 min read
So far I’ve got the design complete for the instruction register along with the initial design for the decoder and so I’m well on the way to having the computer …
04 Jan 2015 - 5 min read
Decoder Design: MOV-8, ALU & SETAB
In my last post I introduced the design for the instruction register which holds the current 8-bit opcode that the computer is executing. The next card to design is the …
01 Dec 2014 - 6 min read
Register Design: Instruction Register
Well, it’s fair to say that I rather underestimated just how much time decorating the new house would take up … and that’s mainly because …
19 Sep 2014 - 11 min read
Sequencing & Control Design: Overview
I’ve now got my computer to a state where I can perform ALU operations and push values around the four registers by manually operating the various control lines. …
19 Aug 2014 - 2 min read
ALU & Registers A-D Test with new Display Cards
Now that the two display cards are complete enough to display and control the status of the ALU and four registers (A-D) it’s time to fit them to the upper enclosure. …
20 Jul 2014 - 5 min read
User Interface: Display B Initial Design and Construction
In my last post I put together the beginnings of the first display card … named in a brilliant flash of nomenclature as display card A. This time I’m turning my …
12 Jul 2014 - 5 min read
User Interface: Display A Initial Design and Construction
Following on from working on the main data switches in my last post this time I’ve taken the first steps in designing and constructing the first of two display cards …
05 Jul 2014 - 6 min read
Now I’ve got a fully working ALU and four registers completed I want to take a short break from card building and turn my attention to making it easier to interact with …
28 Jun 2014 - 2 min read
Register Construction: Completed A and D 8-bit Registers Full Test
The A/D Register card is now complete and looks like this: As usual I’ve put a video together that demonstrates this card in operation. This time I don’t show …
22 Jun 2014 - 3 min read
Register Construction: A and D 8-bit Registers
I haven’t posted in nearly a month but in between bouts of enjoying the rare British sunshine I’ve been plodding away at the A/D register card and it’s now …
26 May 2014 - 2 min read
Register Construction: Completed B and C 8-bit Registers Full Test
The B/C Register card is now complete and looks like this: As usual I’ve put a video together which demonstrates this card in operation … firstly on its own but …