Xilinx XC7Z020-1CLG484I (Zynq-7000 SoC, Artix-7 FPGA)
Recently, I have been working on different MCU and FPGA development boards. The FPGAs to this this point have been simpler, or older,...
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rehsd
Mar 222 min read
Xilinx XC5215-6PQ160C FPGA
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...
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rehsd
Mar 191 min read
Xilinx Spartan-3AN Dev Board Build
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...
117 views0 comments
rehsd
Feb 82 min read
Lattice iCE40 FPGA Journey
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...
499 views0 comments
rehsd
Jan 242 min read
My Personal PCB Checklist
As I am working to improve my PCB design capabilities, I will update this list as a sort of "quality checklist." If you have suggestions...
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rehsd
Jan 174 min read
MCU (and some FPGA) Fun
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...
323 views1 comment
rehsd
Nov 26, 20236 min read
486DLC >>> 486DX PCB Design Updates
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...
334 views0 comments
rehsd
Oct 28, 20234 min read
Agilent 1680/1690 Logic Analyzers
Historically, I have used simple "debuggers" / "analyzers" that leveraged an Arduino Mega, STM32, or Teensy to sample signals and either...
130 views0 comments
rehsd
Oct 23, 20231 min read
Teensy-based Debugger
I have previously used Arduino Mega and STM32 devices to capture signal data for logging and debugging. I have been working on a...
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rehsd
Oct 8, 20231 min read
386 DX - EATX Build
Picking up from 80386 DX Build (rehsdonline.com), I am transitioning my 386 DX build to an EATX form factor, incorporating changes up to...
202 views0 comments
rehsd
Jul 8, 20234 min read
386SX Upgrade / 386DX - Glue Logic, Bus Control PALs, GALs, PLDs, ...
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...
238 views2 comments
rehsd
Jun 25, 20231 min read
Using an Assembly Library from C++ for Applications in FreeDOS (on My 286 Build)
YouTube user @viti95 suggested avoiding making calls to other procedures within the assembly code, as just the CALL process has overhead....
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rehsd
Jun 19, 20232 min read
80386 DX Build
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...
553 views0 comments
rehsd
Jun 15, 20232 min read
386SX Upgrade
I'm looking into a 386SX upgrade for my 286 build. The Intel 386 Hardware Reference Manual includes the following schematic for...
689 views2 comments
rehsd
Jun 13, 20232 min read
Accessing More RAM
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...
133 views0 comments
rehsd
Jun 12, 20231 min read
FreeDOS Running. Lots More Work Needed.
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...
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rehsd
Jun 5, 20231 min read
80286 System Roadmap (updated June 2023)
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...
107 views0 comments
rehsd
May 4, 20235 min read
Troubleshooting FreeDOS Boot on my 286 System - Hangs on execrh() Call in Kernel
As I continue to work towards getting FreeDOS running on my 286 homebrew build, I am encountering a new issue. During boot, the FreeDOS...
185 views2 comments
rehsd
Apr 30, 20233 min read
Troubleshooting CPU Flags Register Between BIOS and FreeDOS
I am running into an issue getting expected CPU flags register values back from interrupt calls made in FreeDOS to my BIOS on my 286...
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rehsd
Apr 17, 20235 min read
FreeDOS Development Environment
In this post, I will share a bit about the development environment I am using to build FreeDOS (and possibly other DOS applications). I...
173 views2 comments
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