BLOG | rehsd

Dec 21, 20213 min read

FPGA VGA for 6502 : First Run

I've made some decent progress getting my FPGA VGA working on my 6502 system. My goal is to have a "smart display" to replace the current...

703 views0 comments

Cmod A7 FPGA : Video Test Pattern Generator

rehsd

Dec 19, 20211 min read

FPGA

Cmod A7 FPGA : Video Test Pattern Generator

Below is the configuration I used to get the Xilinx Video Test Pattern Generator (TPG) working on a Digilent Cmod A7 FPGA. This is based...

231 views7 comments

rehsd

Dec 18, 20212 min read

FPGA

VGA from Cmod A7 Working

Update: I have it working. See postscript at the bottom of this post. I am attempting to get the Arty Pmod VGA Demo running on a Digilent...

288 views0 comments

rehsd

Dec 18, 20211 min read

6502

Prepping My 6502 System for FPGA VGA

I made some updates to my 6502 system to get it ready for my FPGA VGA. Previously, my USB mouse took ten VIA pins (a bit of laziness on...

161 views0 comments

FPGA VGA for 6502 System - Initial Prototyping

rehsd

Dec 15, 20212 min read

FPGA

FPGA VGA for 6502 System - Initial Prototyping

I am currently working on building an improved VGA circuit for my 6502 build. My goal is to offload the video processing and have better...

178 views0 comments

rehsd

Dec 13, 20215 min read

FPGA

Arty VGA Walkthrough

If you are looking to add the VGA Pmod to your Arty A7 and control output from MicroBlaze, the following are the steps I have taken to...

1,228 views0 comments

rehsd

Dec 11, 20211 min read

FPGA

Arty VGA Output from MicroBlaze

Continuing from my post FPGA VGA for 6502: Brainstorming... I am trying to find a decent solution to control VGA output from MicroBlaze....

121 views0 comments

rehsd

Dec 9, 20213 min read

FPGA

FPGA VGA for 6502: Brainstorming

I am currently brainstorming ways to add an FPGA-based VGA circuit to one of my 6502 builds. And... I have questions. :) As part of my...

298 views0 comments

rehsd

Dec 7, 20211 min read

FPGA

VHDL 8-bit CPU - Runtime RAM Updates

I have added UART support to my VHDL 8-bit CPU, along with a Windows application that allows retrieving and setting RAM values at...

298 views0 comments

rehsd

Nov 30, 20212 min read

FPGA

Troubleshooting a MicroBlaze UART

I am trying to determine why I am unable to communicate out through a UART on my Arty A7-100T. Any suggestions on how to troubleshoot...

192 views0 comments

VHDL 8-Bit CPU (Ben Eater edition) Working!

rehsd

Nov 27, 20212 min read

FPGA

VHDL 8-Bit CPU (Ben Eater edition) Working!

As a continuation of FPGA VHDL Implementation of Ben Eater's 8-bit CPU - Progress Update, here's another update on my 8-bit CPU in VHDL...

425 views0 comments

FPGA VHDL Implementation of Ben Eater's 8-bit CPU - Progress Update

rehsd

Nov 20, 20211 min read

FPGA

FPGA VHDL Implementation of Ben Eater's 8-bit CPU - Progress Update

I've been working on a VHDL implementation of Ben Eater's 8-bit CPU. I have VHDL modules built for the clock, registers, bus, RAM, ROM,...

109 views0 comments

rehsd

Nov 17, 20212 min read

FPGA

Connecting VHDL to MicroBlaze

Continuing my project of building Ben Eater's 8-bit CPU on an FPGA, I created the clock module in VHDL. I connected that VHDL to a...

182 views0 comments

rehsd

Nov 11, 20214 min read

FPGA

Arty A7 & OLEDrgb Pmod Walkthrough

My first attempt at getting Digilent's OLEDrgb Pmod working with an Arty A7 was unsuccessful. After a fair amount of troubleshooting and...

755 views0 comments

rehsd

Nov 9, 20213 min read

FPGA

Arty A7 & OLEDrgb Pmod Struggles

Update: I have the OLEDrgb display working! See bottom of post. Original Post First things first... I am new to FPGA development. I am...

379 views0 comments

rehsd

Oct 31, 20212 min read

Other Peripherals

Power Distribution

As I've expanded my 6502 system, power distribution has been a challenge at times. My initial 6502 was built on BusBoard Prototype...

80 views0 comments

Caution: Steep Learning Curve Ahead (for me)

rehsd

Oct 23, 20212 min read

FPGA

Caution: Steep Learning Curve Ahead (for me)

For a while now, I've wanted to dig into field-programmable gate arrays (FPGAs). Today, u/Enlightenment777 provided the kick I needed to...

86 views0 comments

rehsd

Oct 22, 20216 min read

Other Peripherals

Arduino Due, 6502, & SPI... oh my...

Previously, I shared how I was using an Arduino Nano to connect a 6502 to a PC to transfer image data from the 6502 to the PC. See 6502...

251 views0 comments

rehsd

Oct 22, 20211 min read

Audio

6502 Audio PCB Complete!

I have posted previously about my journey to learn a bit about 6502 audio. (A Start to 6502 Audio, 6502 Sound Card -- Suggested changes...

401 views0 comments

6502 Build with SPI & Audio: Progress Update

rehsd

Oct 22, 20212 min read

6502

6502 Build with SPI & Audio: Progress Update

Last month, I transitioned the core of my 6502+VGA+PS2 build (based on Ben Eater's video series and kits) from breadboards to a PCB. My...

236 views0 comments