18 Dec 2013 - 2 min read
ALU Construction: Completed Logic Card Full Test
The ALU logic card is now finally complete! … well, it is now I’ve popped the last few relays into their sockets. The final card looks like this: As the old …
18 Dec 2013 - 1 min read
ALU Construction: Logic Card Wire Wrap 3
I’m now just one session of wire wrapping away from a completed ALU logic card. The final job is to wire up the gating relays that select one of the five logic results …
12 Dec 2013 - 2 min read
ALU Construction: 8-bit Logic Unit Tests
There’s now enough sockets, solder and wires to test all eight bits of the ALU logic card. This isn’t quite a full test as the gating relays that apply one of the …
12 Dec 2013 - 1 min read
ALU Construction: Logic Card Wire Wrap 2
Continuing on with the wire wrapping for the ALU logic card next up is the input and result links: Given the limited range of colours I’ve got to choose from (Black, …
12 Dec 2013 - 1 min read
ALU Construction: Logic Card Wire Wrap 1
Finally, with all the soldering now done, it’s time to set about wire wrapping the ALU logic card. First up is the internal connections within each logic bit: After wire …
10 Dec 2013 - 2 min read
ALU Construction: Logic Card Power Rails
It seems that every time I move on to the next stage of construction on the ALU logic card it’s fiddlier than the stage before it … this stage is no exception. …
10 Dec 2013 - 2 min read
I’ve just realised that as I’ve been constructing the first ALU card I’ve not given much thought to how I’ll actually test the card (or other cards for …
09 Dec 2013 - 2 min read
ALU Construction: Logic Card Relay Sockets
The construction of the ALU logic card is coming along nicely but there’s still a lot of soldering ahead to get all the relay sockets down … and this part is the …
08 Dec 2013 - 1 min read
ALU Construction: Logic Card Header Pins
Following on from the successful construction of the first bit on the ALU logic card in my last post it’s now time to start putting together the other 7 bits and the …
07 Dec 2013 - 2 min read
ALU Construction: 1-bit Logic Full Construction
So, although I probably should construct the logic card methodically a full stage at a time (solder header pins then sockets then wire wrap) I can’t resist fully …
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). …
06 Dec 2013 - 1 min read
ALU Construction: Logic Card Wire Links
Before I can test all of the LEDs laid down so far (to make sure they survived the heat of the soldering iron) I need to add some wire links on the logic card between the LED …