Booting FreeDOS
At this stage of my homebrew 286 system build, I have an IDE interface to a compact flash (CF) card. I have begun implementing disk...
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rehsd
Apr 14, 20231 min read
IDE Interface
I am currently working to see if I can boot to an IDE storage device (specifically, a CF Card) and get FreeDOS's kernel loaded. I'll use...
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rehsd
Apr 2, 20231 min read
286 Build - Six Months In
I am nearly six months into my 286 project. While I started on breadboards, I am now at a nice stage where I have an ATX form-factor...
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rehsd
Mar 10, 20231 min read
Interrupts and More Interrupts
I am starting to implement support for additional interrupts on my 286 system. This includes BIOS interrupts and DOS interrupts. Relevant...
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rehsd
Mar 9, 20231 min read
Working with AY-3-8910, YM2149 Programmable Sound Generators
Sample code at x86/Audio/20230308 at main · rehsd/x86 (github.com).
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rehsd
Feb 24, 20235 min read
Using C/C++ with my 286
Up to this point, all code running on my 286 system has been x86 assembly (real mode). I am hoping to learn how to compile C or C++ code...
184 views3 comments
rehsd
Feb 20, 20232 min read
286: Onboard ROM Updates
A helpful feature that I am looking to add to my 286 system is onboard flash ROM updates, where I do not need to remove the flash ROMs to...
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rehsd
Feb 17, 20231 min read
Sound Card for my 286 System
For my sound card, I plan to leverage previous work that I did for my 65816 system build. I will refactor the sound card to support my...
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rehsd
Feb 15, 20232 min read
Mouse for my 80286 System (SPI to PS/2)
My 286 system does not have built-in mouse support (yet). I have been experimenting with a few options. Back on my 6502 system, I added...
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rehsd
Feb 9, 20232 min read
VGA 640x480 ISA Card
As a follow-up to VGA Next: 640x480 ISA Card, I now have a functional version of an ISA VGA card working. The card supports 640x480 with...
366 views0 comments
rehsd
Feb 5, 20231 min read
Using PSoCs for Rapid Prototyping
While working on my 6502 back in 2021, u/Enlightenment777 had suggested I look into Programmable System-on-Chips (PSoCs). It took me...
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rehsd
Jan 25, 20233 min read
80286 System Roadmap
Last October (2022), I started my learning journey to develop a 286 system. See Start to an 80286 System. As of this writing, I have a...
218 views3 comments
rehsd
Dec 31, 20223 min read
VGA Next: 640x480 ISA Card
One of my goals for my 286 system is to run MS-DOS at some point (ideally, 6.22). To get to that stage, I have some heavy lifting to do....
616 views5 comments
rehsd
Dec 18, 20223 min read
VGA for my 80286
As a follow-up to Brainstorming... Video Card for 286 System, I am now working to get my VGA card working in my 80286 system. Initial...
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rehsd
Dec 13, 20222 min read
Transitioning 80286 from Breadboard to PCB
Over the past couple of months, I have been working to build out a breadboard-based 80286 system. See /blog/categories/x86. I plan to...
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rehsd
Dec 8, 20221 min read
80286 Build #2 (Intel Basic System Configuration), Part 4
This is part four of my blog posts on my 286 basic system build. At this stage, PS/2 keyboard input, interrupts, and LCD output are...
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rehsd
Nov 24, 20221 min read
286, SPI, and a 6522 VIA
I recently added basic SPI support to my 80286 system with the help of a W65C22S Versatile Interface Adapter (VIA). Additional Reading...
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rehsd
Nov 20, 20224 min read
Brainstorming... Video Card for 286 System
I am researching options for a video card for my 80286 system. I will update this page as I learn more. Related: VGA Add-in Card for My...
231 views2 comments
rehsd
Nov 16, 20221 min read
80286 Build #2 (Intel Basic System Configuration), Part 3
This is part three of my blog posts on my 286 basic system build. At this stage, PS/2 keyboard input, interrupts, and LCD output are...
102 views0 comments
rehsd
Nov 14, 20224 min read
Working on Interrupts
Current Status: RESOLVED I am currently working to get interrupts running on my 286 system. I am starting with a simple low-to-high...
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