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The Basics
Log from 65c02 Homebrew Computer on breadboard
Although this is an on-going project, I have been working on it for over a year before publishing anything, so I'll try and capture some of my approach, experiences and lessons learnt to bring this site up to date. One thing I have been doing over the...

Serial Communications
Log from 65c02 Homebrew Computer on breadboard
Serial Input / OutputOne of the key methods of input and output with my home brew is serial communications to and from my development machine (a modern Windows 10 laptop).The serial commmunication protocols I remember from in the 80s and early 90s was...

SD Card Interface
Log from 65c02 Homebrew Computer on breadboard
Latest Update - Optimising SD Card send and get byte routinesI have been tinkering with the SD card low level routines. It was bugging me that when I wired up the SD card pins, the MISO line was attached to pin 2 Port B of one of my VIAs. MISO stands...

Which Microcontroller?
Log from Hands Free Phone Accessability
Estimating RequirementsIn order to make this device possible, we need a micrcontroller to control the Gesture Sensor and Bluetooth Module. The Gesture Sensor uses I2C protocol with an extra pin needed as in Interrupt Pin. The Bluetooth Module uses UART...

Joe-Mon Wins at HackIllinois
Log from Beckman DU 600 Reverse Engineering
TL;DR: participated in hackathon, worked on Joe-mon, didn't expect to win, won '1517 Grant Prize'. https://www.facebook.com/hackillinois/posts/1360661100660096:0https://devpost.com/software/joe-monWell, this is old news considering HackIllinois was back...

The hardware
Log from Quick and Dirty Parallel FLASH Programmer
The hardware is simple enough to make rather quickly. Cut a piece of strip (vero) board to size and cut a groove down the middle. I used a Dremel like tool to cut the gap. Grab some right angle header pins and a dual row header. An old IDC socket like...

VGATonic Road Map
Log from VGA Graphics Over SPI and Serial - VGATonic
Most everything I've got planned involves the Atmel silicon onboard, the ATTiny 2313a.The ATTiny is the (128 Byte) brains of this setup - it has a Universal Serial Interface which I am using as SPI. For the early demo, the first thing the board does...

Planning for Asynchronous Serial Graphics Mode!
Log from VGA Graphics Over SPI and Serial - VGATonic
As of tonight, VGATonic has all of the initial promised specs working:Hardware supported: 640x480, 320x240, 160x120, 80x60Hardware supported: 8 bit depth, 4 bit depth (CGA/VGA original standard), 2 bit depth, 1 bit depthHardware 'Acceleration' by Skipping...

Asynchronous Serial and Terminal Emulator Support
Log from VGA Graphics Over SPI and Serial - VGATonic
Today, the ATTiny 2313a comes alive!Serial support (or, as I discussed today in the Hacker Channel, other names you might know it as - "Asynchronous Serial", "RS-232 TTL", "TTL Serial", etc.) was always on the roadmap for VGATonic, but my Terminal Emulator...

VT52 Compatible Commands on VGATonic, and Custom/Administrator Sequences
Log from VGA Graphics Over SPI and Serial - VGATonic
VGATonic has a terminal emulator built in, and this post will detail how that works. It uses VT52 compatible commands, and also shows special sequences I added to control how VGATonic works.For all of these, you need to hit 'escape' or send ASCII 27...

Build/Programming Details
Log from VGA Graphics Over SPI and Serial - VGATonic
The User Guide in the last entry has an order of operations to build VGATonic. This article is more of an overview and a look at how to program the firmware for the CPLD and the microcontroller.This guide is for Rev_A of the board (link is to GitHub)...

VGATonic the Semifinalist!
Log from VGA Graphics Over SPI and Serial - VGATonic
Hey folks, I wanted to thank you all for the support - VGATonic is a Semifinalist in the 2015 Hackaday Prize contest!I also entered into the Best Product category, but VGATonic was edged out by 10 very excellent entries - five of which are in the running...

VGATonic Goes on a Diet
Log from VGA Graphics Over SPI and Serial - VGATonic
I just built 2 boards from a new batch of VGATonics I sent to OshPark: this one is 39.1% smaller, roughly 5.5 square inches versus roughly 9 for the old one:Sure, the RCA jack is gone on this version (but not forgotten - on the back side of the board...

VGATonic Rev B Posted to GitHub!
Log from VGA Graphics Over SPI and Serial - VGATonic
As you probably suspected from the past two posts, Rev B is ready - VGATonic is roughly 40% smaller!You can find it on GitHub. The BOM is here on Hackaday.io.New Features!External Microcontroller clock with magic serial frequency of 7.3728 MHzAllows...

Call for excellent driver programmer
Log from SD card sized board, let's say "SDuino"!
It will be ultra nice if this card could be programmed through SD card interface. Indeed SD card interface has a definition of "iSDIO" which is different from general storage access, and I imagine and guess if appropriate driver is developed in OS level,...

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