The Arithmetic Unit is one of the three cards making up the broader Artihmetic Logic Unit (ALU).
This card primarily handles 8-bit addition operations (adding together the inputs from register B and C) but can also perform an 8-bit increment (adding 1 to the input from register B). In either case the output from this card can then be loaded into register A or D).
Below is a list of the blog articles relating to this card (in reverse date order):
23 Feb 2014 - 1 min read
ALU Construction: Completed Arithmetic Card Full Test
The ALU arithmetic card is now complete! The final card looks like this: As I did for the ALU logic card before I’ve put the following YouTube video together which gives …
19 Feb 2014 - 1 min read
ALU Construction: Arithmetic Card Wire Wrap 2
I’ve managed to squeeze in a couple more wire wrapping sessions this week so in this post there’s a few photos of progress so far. Inputs B and C are fully wired …
16 Feb 2014 - 2 min read
ALU Construction: Arithmetic Card Wire Wrap 1
Fear not (just in case you were for some reason) all this talk of Sketchup and enclosures and so on hasn’t totally diverted me from the main task of constructing the …
26 Jan 2014 - 2 min read
ALU Construction: Arithmetic Card Power Rails
Another round of soldering done … this time putting down the power rails on the arithmetic card along with some soldered wire links. This is the last of the soldering …
21 Jan 2014 - 2 min read
ALU Construction: 1-bit Arithmetic Full Construction
So, as mentioned in my last post this time I’ve put in the wire links and wraps needed to test the first bit of the arithmetic card. With these in place I can make sure …
17 Jan 2014 - 2 min read
ALU Construction: Arithmetic Card Relay Sockets
It’s always a fiddly job getting the relay sockets soldered in and the ALU arithmetic card proved no exception. With this in mind I’ve been spreading the work out …
06 Jan 2014 - 2 min read
ALU Construction: Arithmetic Card Header Pins
Following on from the successful construction of the ALU logic card in my last post it’s time to start off the new year with the next ALU card (number 2 of 3 ALU cards …
06 Dec 2013 - 1 min read
Following on from my last post I can now test the LEDs that have been soldered and hooked up to the header pins on each of the three ALU cards (Logic, Arithmetic and Control). …
05 Dec 2013 - 3 min read
ALU Construction: LED Header Pins
So far, in the construction of the three ALU cards (Logic, Arithmetic and Control) I’ve soldered down the connectors and LEDs. It’s now time to solder in some …
02 Dec 2013 - 4 min read
ALU Construction: Connectors and LEDs
As promised in my last post it’s finally time to get the soldering iron out and make a start on constructing the three cards that make up the ALU. I’m going start …
17 Nov 2013 - 5 min read
ALU Design: 8-bit Arithmetic Unit
In the last post I introduced the design for the 1-bit Arithmetic Unit. This post covers connecting eight of these units together to make an 8-bit Arithmetic Unit along with …
15 Nov 2013 - 3 min read
ALU Design: 1-bit Arithmetic Unit
This post covers the design of a 1-bit Arithmetic Unit that can add two input bits together (B and C) with carry in and out. Here’s a schematic of the 1-bit Arithmetic …
