A Blog About Random Computer Subjects
Frank DeCaire Summary I’ve added the 74181 ALU TTL circuit to my logic simulator. This blog post will discuss the differences between this ALU and the 74381 that I discussed about in a previous blog post. The 74381 I added the 74381 ALU (Arithmetic Logic Unit) circuit to the logic simulator a few weeks ago and then … Read moreThe ALU
Summary I’m going to continue with my logic simulator project in this post. This project has turned into a serious obsession, ahem, hobby. My final goal is to be able to simulate a full computer circuit. TTL Logic As I’ve mentioned in my previous posts, there is a wiki page for TTL logic that lists … Read moreSimulating TTL Circuits
Introduction I’m sure readers are becoming bored with Flip Flops by now, but bear with me. The previous JK flip flop was a simple 4-NAND gate device, this circuit is the standard two flip flop device that is more stable when used in toggle mode. The Circuit The Master/Slave flip flop circuit is a bit … Read moreJK Master/Slave Flip Flop
Introduction I’ve been working on a simulation of the JK flip flop for quite some time now. I had to tweak my algorithms a bit to overcome problems with an unstable condition that I’ll discuss in this blog post. Handling Unknown Inputs One of the problems with circuits that contain feed back connections is that … Read moreJK Flip Flop Simulator
Summary In my last post I described a logic circuit simulator that I was working on. I have continued to work on this simulator source code and have discovered a difficulty in simulating a flip-flop. While researching for a creative solution to my dilemma I stumbled across a circuit called a Falstad circuit. This … Read moreFalstad Circuit Simulator and the SR Latch
Summary One of my favorite college courses was a computer simulation. This was a 400-level course that required calculus-based statistics. Our projects included a project to simulate real-world queuing problems like a Mcdonald’s drive-through line and an airport with one runway. The answers that we were required to ask were things like: How many cars … Read moreDigital Logic Simulator
Introduction I’m going to switch it up a bit and talk about one of my other hobbies. Electronics. I haven’t worked with digital circuits in a while. In fact, it’s been so long that I had to do a lot of research to find out what is new in the world of electronics. Micro-controllers have … Read moreHomebrew Computers
Introduction There are a lot of articles on how to use Moq, but I’m going to bring out my die roller game example to show how to use Moq to roll a sequence of predetermined results. I’m also going to do this using .Net Core. The Setup My sample program is a game. The game … Read moreUnit Testing with Moq
Summary It’s been a while since my last blog post. My summer has been filled with hiking and some travel (involving more hiking). One subject I’d like to blog about is IIS and how to set it up for development purposes. I’ve posted information about this before (see here and here), but this time I’m … Read moreSetting up IIS
Summary I’ve done quite a few posts on unit testing in the past. I keep a list of subjects that I would like to blog about so I have a ready list to choose from. My list of unit testing subjects is getting large and it’s time to clear the spindle. So in this post … Read moreDependency Injection and IOC Containers