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...
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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...
317 views0 comments
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
Jun 12, 20221 min read
480x320 Debug LCD for 65816 System
To enable more verbose debug logging at runtime, I have added a higher-resolution LCD. Communication from the 65816 is handled with SPI....
238 views0 comments
rehsd
May 5, 20221 min read
Eater 6502+PS2+VGA PCB - Building Your Own
Previously, I designed a PCB for my 6502, PS/2 keyboard, and VGA. The design is based on Ben Eater's video series. The only addition I...
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rehsd
Apr 24, 20222 min read
65816 Assembly Coding Series
As I'm learning and implementing assembly code for my 65816 PC, I'll post periodic updates here. I'm doing OK with the assembly so far,...
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rehsd
Apr 22, 20222 min read
65816 PC Build Update (April 2022)
Back in January, I decided to start building a 65816 "PC." Up to that point, I had built a 6502 system with basic elements of a PC. The...
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rehsd
Apr 20, 20221 min read
Sprite Transparency
My first attempt at sprite transparency... and it's pretty rough. I updated my image conversion application to support converting images...
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rehsd
Apr 9, 20221 min read
65816+VGA: First Moving Sprite
Continued from VGA for 65816: First Run at Moving Content... My first animated sprite (32x32) on my 65816+VGA system! While the video...
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rehsd
Apr 7, 20221 min read
VGA for 65816: First Run at Moving Content
So much room for improvement, but it's a start to moving content... The 65816 is running at 5 MHz for this test.
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rehsd
Apr 7, 20222 min read
VGA for 65816: Start of Color Calibration
As I am working on my VGA card build, the next step for me is to improve the accuracy of the color output -- well, as accurate as I can...
285 views0 comments
rehsd
Mar 31, 20224 min read
VGA Add-in Card for My 65816 PC
I have started the assembly of my VGA card for my 65816 PC. In this running post, I will share my updates as I work through assembly,...
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rehsd
Mar 14, 20225 min read
65816 PC Build - Lessons Learned (running post)
I will update this post as I work on my 65816 PC and identify mistakes in my 65816-related PCBs, so check back to see how they all pile...
794 views1 comment
rehsd
Mar 12, 20223 min read
65816 "PC" PCB Progress
I have the initial layout and routing working for my 65816 motherboard, video card (including memory daughter boards), and prototyping...
448 views15 comments
rehsd
Mar 10, 20221 min read
65816+VGA Progress Update
Continued from 65816: Driving VGA Through Dual-port SRAM... I made some progress today on my 65816 with VGA 2.0. Learned a bit about...
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rehsd
Mar 9, 20223 min read
65816: Driving VGA Through Dual-port SRAM
At the end of January, I posted A Start to Video Output for My 65816, where I built a stackable dual-port SRAM PCB that could later be...
296 views2 comments
rehsd
Mar 7, 20221 min read
The Obligatory Gouldian Finch Post
Continued from VGA 2.0: First fire-up of the basic circuit... Here's my obligatory finch post: I can probably work on the resistor values...
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rehsd
Mar 6, 20223 min read
VGA 2.0: First fire-up of the basic circuit -- it's not pretty :)
I have fired up the basic circuit for my VGA 2.0 (320x240x1byte). I can't say it's pretty, but it's at least outputting something. Now,...
257 views0 comments
rehsd
Mar 4, 20224 min read
Using GAL22V10 Programmable Logic Devices
I have recently started using programmable logic devices (PLDs) in some of my projects. Below are the steps I am using, along with some...
869 views2 comments
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