The decoder card takes its input from the instruction bus and decides which class of instruction the input represents. This is then used by the controller and sequencer cards in order to perform their tasks. The decoder card makes up part of the broader ‘control unit’ within the computer.
Below is a list of the blog articles relating to this card (in reverse date order):
05 Jan 2020 - 1 min read
In my last post I covered off the full design for the decoder card so all that remains is to get it soldered up and tested. As before I’ve put a video together which …
22 Dec 2019 - 4 min read
Decoder Design: Schematic & PCBs
I’ve almost got everything I need now to get my relay computer to do branching. The hard work of designing and constructing the sequencer and controller units is …
07 Jun 2015 - 3 min read
Decoder Construction: MOV-8, ALU & SETAB
In a change from prior form I’m combining the construction and testing of the next card in to a single post this time. Partly because this card is a nice easy one but …
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 …
