**NOTE: EasyEDA shows the most recent WIP for this project, which might be part way through me making changes. Before using the PCB layout please do get in touch (comment or message) so I can let you know if what you're seeing is stable! I create labelled versions of the project, but EasyEDA doesn't allow me to publish a specific version :-(**
[GAL code is available on GitHub.](https://github.com...
Simple Z80 test design - single board with all the basics and a few luxuries.
**NOTE EasyEDA shows the most recent WIP for this project, which might be part way through me making changes. Before using the PCB layout please do get in touch (comment or message) so I can let you know if what you're seeing is stable! I create labelled versions of the project, but EasyEDA doesn't allow me to publish a...
Modification board to provide CVBS (Composite) video output from the Colecovision
Surface Mount only Version
LM318 or LM310 Can be used in this circuit, there is a jumper on board to select which one you used.
This board combines the best features of currently available RC2014 memory boards in one:
- One 512K memory chip which can be RAM or ROM (selected with 3 jumpers)
- One 512K RAM chip
- Select between linear and paged memory using a single jumper
- Select between linear and paged memory in software (from Z80 or BusRaider)
- Support for the PAGE pin on the RC2014 bus (with an optional pull-up selec...
Replaces TI99/4A power board to allow it to be powered with a 16v to 18v DC Power Supply
Make sure to check the pinout on your original power board, the pinout is the same as my (UK) model but i've heard there are different pinouts on other models, so you may need to make an adapter cable
- V7805-2000 https://www.digikey.co.uk/product-detail/en/cui-inc/V7805-2000/102-2175-ND/2352134
Based on the Arduitape by Duncan Edwards. Download his firmware from http://arduitape.blogspot.com/ and remember to support him and his work.
Arduino Micro SD Card Reader Module
IIC/I2C 1602 44780 LCD Display
Arduino Audio Amplifier Board
2 x 3.5mm Audio Jacks
1 x 2.5mm Audio Jack
5 x Momentary Push Buttons
3 x 2 Pin Header
1 x 4 Pin Header
1 x 5 Pin Header
2 x 6...
This is an attempt to create your own version of the calculator on the ATMEGA8 chip.
The purpose of the conclusions of the microcontroller is seen in the circuit.
The handling of 20 keys is described on my blog - http://un7fgo.gengen.ru/?p=2127 (I apologize, only in Russian).
# Wifi Modem ESP8266 - ESP-01 #
**for Retro Computer**
Simulates the old-style Hayes "AT" commands, so that the ESP8266 appears to the terminal as if it were a Hayes modem. These "AT" commands may then be issued to the ESP8266 in order to force it to connect to a wireless access point, and from there to make one or more manageable connections to the internet. It also includes...
Replacement for Atari Falcon Dallas 12887 RTC brick. Featuring pin header for battery (3V) and reset pins. Closing them for a short time while turning on the machine should reset the stored clock settings. Disconnecting the battery will probably do the same thing.