Introduction to the 1802 Membership Card Timer In this section, we’ll crate a scan based 1802 Membership Card Timer using BASIC3. The 1802 Membership card uses the COSMAC 1802 Processor. Since we are basing the timer on the scan rate, you may have to vary the delay loops to calibrate Read More »
Introduction to COSMAC 1802 I/O Operations COSMAC 1802 I/O Operations allow us to get data from an input port, and write data to an output port. In this case, I’m using the 1802 membership card. On the 1802 Membership Card, we use Port 4 for both the switches and the Read More »
Introduction to Assembly Programming Tips In this section, I’m compiling a list of Assembly Programming Tips. Mainly, this is for manipulating data in assembly language. Most of these methods will work with any processor. It’s important to realize, though, that you might have special instructions in some processors that handle Read More »
Introduction to 6502 Stack Operations 6502 Stack Operations are very useful in programming. You can temporarily store data that you need to retrieve later. Specifically, we might use the stack when calling subroutines in the 6502. We might back up register data that we need to retrieve later on. The Read More »
Introduction to Assembly Language Addressing Modes There are several Assembly Language Addressing Modes that we will discuss in this section: Immediate, Direct, Indirect, base-pointer, and Indexed mode. There are other modes, but these are the main modes you will use when starting out in assembly. Depending on which processor you Read More »
Introduction to Customized System Training with ControlLogix Customized System Training with ControlLogix uses your own schematics, and your own programs to TRAIN your students. If you are sending students to seminar-type training, then your students may not be getting the most out of the class. Your plant programs are proprietary. Read More »
Creating Hello World in Modern Assembly To create Hello World in Modern Assembly (x86 / x64) we’ll need to have an assembler installed. In this case, I’m using the GNU Assembler (GAS). I’ll set this up in Debian Linux. This assembler is in the “build-essential” package. We’ll walk through the Read More »
Introduction to Assembly Registers and Compatibility Modes Before we begin to program, we need to understand Assembly Registers and Compatibility Modes. In this case, we’ll discuss Assembly Language with the x86 / x64 processors. Assembly is a low level language that allows you to write machine code without the need Read More »
Overview of Modern x86_64 Assembly Language Mnemonics Modern x86_64 Assembly Language allows us to write programs on your computer.. Assembly is a low level language. In other words, you are basically writing machine code directly. This forces you to have a good understanding of how the processor and memory work Read More »
How to Add Programs to an IMSAI Disk There are several methods to Add Programs to an IMSAI Disk. One way is to use XModem, which is a bit time consuming for many files. Another way is to add the files to an image using CPMTOOLS, which is the method Read More »
