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...
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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, 20223 min read
Building a 65816 Emulator
(Latest video posted at the bottom.) While I'm waiting for my 65816 system PCBs to come in, I thought I would see how far I can get with...
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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...
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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...
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rehsd
Mar 7, 20221 min read
65816 Now Running at 8 MHz
(Continued from 65816: VIA1 Working...) I updated my 65816 clock to 8 MHz. It seems to be taking it OK. :) 16 MHz oscillator into 7474...
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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...
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rehsd
Mar 3, 20221 min read
VGA Card for 65816 PC - Step 1: Basic Circuit
Continuing from A Start to Video Output for My 65816... I am working on the core circuit for my VGA card. I am targeting 320x240x1byte....
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rehsd
Mar 1, 20222 min read
65816: VIA1 Working
I was able to get VIA1 working today! I have it addressed at $108000 and have decode logic working for this part of the I/O range. I...
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rehsd
Feb 28, 20221 min read
65816: Finally Making Progress
I've been a bit stuck for the last few weeks. See Troubleshooting 65816 ROM/RAM and Troubleshooting 65816 ROM/RAM, Part 2. Thanks again...
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rehsd
Feb 26, 20223 min read
Troubleshooting 65816 ROM/RAM, Part 2
Earlier this month, I posted Troubleshooting 65816 ROM/RAM. I have updated that posting as I have had updates. Unfortunately, I have not...
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rehsd
Feb 23, 20222 min read
Brainstorming: 65816 'Motherboard'
In my 6502 system, I use VIAs, pin headers, and ribbon cables to connect expansion cards (e.g., my sound card). While this has worked...
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rehsd
Feb 9, 20221 min read
65816 (or 6502) Proto Board
As I've been trying to get my 65816 running, I've built a breadboard version and a solderable prototype board version. Managing the...
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rehsd
Feb 5, 20225 min read
Troubleshooting 65816 ROM/RAM
Previously, I have been able to get ROM and RAM working together in my 65816 system, as seen here. However, I have had some sporadic...
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rehsd
Jan 31, 20221 min read
65816 Build Update: Moving to Solderable Prototype Boards for the "Core"
Previously, I was able to get my 65816 working with ROM and basic RAM. Since then, I have moved my address decode logic from the...
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rehsd
Jan 31, 20221 min read
A Start to Video Output for My 65816
For my "VGA 2.0" circuit, I am going to try and get 320x240x1byte running. To support this, I will be using three IDT7007 dual-port SRAM...
234 views1 comment
rehsd
Jan 25, 20221 min read
65816 Build: First Code (ROM Running). Bank 0 RAM Working.
My address decode logic appears to be working (so far). I have a simple program running from flash ROM now. Bank 0 RAM now running. I...
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rehsd
Jan 23, 20221 min read
65816 First Fire Up - No Magic Smoke
Well, I have applied power. Magic smoke not detected. I haven't yet reviewed the monitored data to see if it matches what is expected at...
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