BLOG | rehsd

Interrupt Support for My 16-bit Processor

I am researching how to best implement interrupt support for my 16-bit processor. I received some nice input in this Reddit discussion...

16-bit CPU

rehsd

Sep 2, 20222 min read

New to SMT soldering - Trying five different ways to solder a TSSOP-48

This is my first attempt at soldering SMT ICs. In this video, I try five different ways to solder a TSSOP-48 onto a PCB. For those of you...

rehsd

Aug 19, 20222 min read

ISA Slot & Edge Wear

I have been using ISA slots and ISA edge connectors on many of my recent builds. I was asked some great question about durability...

rehsd

Aug 15, 20222 min read

16-bit Processor Build - Design Work, part 2

Continued from 16-bit Processor Build - Design Work, part 1... Currently-planned Instructions My current plan is to have approximately 40...

16-bit CPU

rehsd

Aug 15, 20223 min read

16-bit Processor Build - Initial Assembly

I have started the hardware build of my 16-bit processor. In this running post, I will share progress updates and lessons learned as I...

16-bit CPU

rehsd

Jul 29, 20228 min read

16-bit Processor Build - Design Work, part 1

As I have my VHDL-based prototype of my 16-bit processor running, I am now starting the design work on an actual hardware implementation....

16-bit CPU

rehsd

Jul 20, 20229 min read

Building an Assembler for My 16-bit Processor

I have started building an assembler for my 16-bit processor (prototyping in VHDL, later will implement in hardware). Initial assembler...

16-bit CPU

rehsd

Jul 9, 20221 min read

Building a 16-bit CPU on an Arty Z7-20

I am hoping to learn more about processors by building a 16-bit processor. I previously built an 8-bit processor based on Ben Eater's...

16-bit CPU

rehsd

Jun 24, 20226 min read

16-Bit Processor (Approach to Bus and Modules)

I have previously built an 8-bit processor (my 8-bit) using Ben Eater's video series. Since then, I have been spending time on 6502 and...

16-bit CPU

rehsd

Jun 22, 20222 min read

Eater 8-bit CPU Emulator for my 65816 System

To practice my 65816 assembly, and refresh myself on Ben's 8-bit CPU... And an emulator running inside an emulator... 🙂 On my Windows...

8-bit CPU

rehsd

Jun 20, 20221 min read

65816 System - June 2022 General Update

In January of this year, I decided to try to build a new system based on the 65816 processor. It has now been almost five months, and I...

65816

rehsd

Jun 17, 20222 min read

VIA Timer for Background Tasks, an NES Controller, and a Debug Screen

65816

rehsd

Jun 15, 20220 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....

65816

rehsd

Jun 12, 20221 min read

65816 - Cached sprites, a joystick, and Mario enters the scene.

I have been posting updates to 65816 Assembly Coding Series, but I know people may not catch updates to existing, running blog posts. The...

rehsd

Jun 9, 20221 min read

65816 Sound Card Substantially Complete!

My sound card is now substantially complete, and I can continue working on system assembly code to better utilize it. I have the sound...

Audio

rehsd

May 30, 20221 min read

Creating New Music for My 65816 Sound Card

I was getting a bit tired of the previous song I had been using for my sound card testing. 1SMHARRIS suggested a song to try out next. In...

Audio

rehsd

May 16, 20222 min read

65816 Sound Card: First Song Playback from SD Card (SPI) & Updated Output Schematic

I now have the onboard SD Card (SPI for communication) working on my sound card. I ended up going without the hardware shift registers...

Audio

rehsd

May 14, 20222 min read

Arduino-controlled Programmable Sound Generator, with a Windows Interface

As I've been making some good progress on my sound card for my 65816 system (see /audio), I thought it would be good to start building...

Audio

rehsd

May 7, 20222 min read

65816 Sound Card: First Song Playback from Onboard Media ROM

Continued from Sound Card 2.0 PCB Build (rehsdonline.com)... I now have playback working from the media ROM on the sound card....

Audio

rehsd

May 6, 20222 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...

6502

rehsd

May 5, 20221 min read