rehsd

Recently, I received a request to walk through the creation of a two-layer, through-hole PCB in EasyEDA Pro. As I considered what kind of...

As my custom Zynq-7000 board has been working fairly well (see my previous blog post ), I have been learning about PetaLinux. I am...

Recently, I have been working on different MCU and FPGA development boards. The FPGAs to this this point have been simpler, or older,...

I have a batch of Xilinx XC5215-PQ160AKMOO21 FPGAs. These are old FPGAs and it will be a challenge (if not impossible for me) to get one...

I am just beginning to work on a dev board for a Xilinx Spartan XC3S200AN-FTG256AGQ1413. I plan to use this page to capture information...

As part of my post on MCUs, I added a Lattice iCE40 FPGA to the mix. While I have done a little bit of work with FPGAs in the past, it...

I am starting to experiment with different microcontrollers (MCUs). I am hoping to learn about 8-bit, 16-bit, and 32-bit MCUs -- from a...

As I have gotten my 386 DX upper and lower motherboard PCBs working -- at least to the point of validating much of the design -- I am now...

Picking up from 80386 DX Build (rehsdonline.com), I am transitioning my 386 DX build to an EATX form factor, incorporating changes up to...

For my 286 to 386SX upgrade interposer PCB, I need to implement logic for S0# and S1# (along with a few other signals). For my 386DX...

While I continue to build out my 286 (386 SX) system, I thought I would start learning more about the 80386 DX. I am hoping to have a...

I'm looking into a 386SX upgrade for my 286 build. The Intel 386 Hardware Reference Manual includes the following schematic for...

I am researching how to add additional RAM to my 286 build. I started by thinking about a memory expansion card for my system. That has...

I now have FreeDOS running on my 286 build. In this running post, I'll add information about incremental updates I am doing. In the...

Back in January of this year, I posted a list of potential roadmap items for my 26 build. See 80286 System Roadmap (rehsdonline.com). As...

As I continue to work towards getting FreeDOS running on my 286 homebrew build, I am encountering a new issue. During boot, the FreeDOS...