- - 04/10/2018 - WiFi-UART Serial Bridge Using ESP8266 or ESP32
In this article, it’s time to make some serial data fly over the air!

- - 00/00/0000 - ESP32 WebSerial: Web-based Remote Serial Monitor
In this guide, you’ll learn how to create and use a web-based Serial Monitor for your ESP32 projects using the WebSerial library. This creates a web-based interface to output debugging messages, as you would do with a regular serial monitor. You can also send messages from the web-based serial monitor to the ESP32.

RNT - 00/00/0000 - ESP32 Web based Serial Monitor (WebSerial Library)
In this user guide, we will build an ESP32 web server which will act as a remote serial monitor. This will be achieved by using the WebSerial library and programming the ESP32 board in Arduino IDE. Additionally, we will use the ESPAsyncWebServer library as well. The web based serial monitor will work just the same way as the usual Arduino IDE serial monitor works for debugging purposes. By the end of this article, we will be able to send and receive text from the ESP32 to the web serial. We will show you how to build the web serial as well as how to use it with ESP32 module.

RNT - 00/00/0000 - ESP32 Web based Serial Monitor (WebSerial Library)
In this user guide, we will build an ESP32 web server which will act as a remote serial monitor. This will be achieved by using the WebSerial library and programming the ESP32 board in Arduino IDE. Additionally, we will use the ESPAsyncWebServer library as well. The web based serial monitor will work just the same way as the usual Arduino IDE serial monitor works for debugging purposes. By the end of this article, we will be able to send and receive text from the ESP32 to the web serial. We will show you how to build the web serial as well as how to use it with ESP32 module.

RNT - 01/01/2022 - ESP32 – How to Telnet or Serial Monitor over Wifi?
I need a serial telnet server on the ESP32 – that is, to connect a serial monitor over Wifi to the ESP32. This is the most basic thing one may want to do if not connecting to a web server.

GIT - 01/01/2023 - ESP32-Serial-Bridge
Transparent WiFi (TCP) to all three UART Bridge, supports both AP and STATION WiFi modes. The .ino file is the code for the ESP32. Use Arduino IDE for ESP32 to compile and upload it to the ESP32.

HTG - 06/13/2019 - How-To Film With Your Own Green Screen Using Your iPhone

Hackaday - 07/07/2018 - CPM Z80 Board Version C - BOM, Schematic, etc

Hackaday - 07/01/2020 - Z80 CP/M with CompactFlash card
To explore CP/M with PCMCIA card, I built Tom Szolyga's existing project. Corrected serial connectors to match FTDI serial-to-USB cable pinout. Fixed a design flaw in the USB cable connections. Now working with 3.684 MHz oscillator and 57600 baud communications.

GlassTTY - 03/11/2020 - Z80 SBC using Tom Szolyga’s SBC-Z80 Board
This article forms a short review of the ‘homebrew’ Grant Searle designed Z80 CP/M machine, built using Tom Szolyga’s Z80SBC printed circuit board. The computer is a single board Z80 CP/M enabled computer that uses a CF Card to provide disk storage. The basic machine simply requires a VT100 type terminal to be connected to one of the device’s headers via either an FTDI type cable or a TTL to RS232 converter.

image - - - Assembly - Tom Szolyga’s SBC-Z80 Board
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ebay - - - Toms CP/M Z80 SBC Ver. C - REV A PCB
PCB Ordering option at ebay ($14.07 3/31/2025)

pcb4diy.de - - - Toms CP/M Z80 SBC Ver. C - REV A PCB
PCB Ordering option

GitHub - - - Tom80 - Z80 Based SBC
Z80, 32K EEPROM, 64K RAM, 16550, CTC, PIO, Parallax Prop for SD/VGA/PS2KB

G - - - Tom80 - Z80 Based SBC on Google Groups
Small Computer Monitor User Guide V1.0 for the Z80

SCC - - - Tom80 - Z80 Based SBC on Google Groups
Tom Szolyga’s SBC version C on smallcomputercentral

GIT - 06/12/2023 - Welcome to the Z80-Retro wiki!
This repo provides software and information supporting my Retro Z80 system, which currently consists of three separate cards (with links to OSJWLab schematics)

- - - - Grant's 7-chip Z80 computer
Only 6 chips if using a USB to TTL serial cable, a fully operational Z80 computer running BASIC can't get simpler than this! 8K ROM, 56K RAM, Z80B @ 7.3728MHz or 3.6864MHz clock. 115,200 or 57600 baud. Approx 200mA, Microsoft BASIC with all I/O via serial.

EEV - - - Topic: Grant Searle's (not-so-) Simple-Z80
Grant Searle's Simple Z80 in its 32k format is a great computer, reminding me very much of my old Nascom-1 back in 1978. Its true Retro and quick, easy and cheap to make using not-too-hard-to-find parts, and Jeff Tranter has kindly made his PCB available for it via easyeda.

YouTube - 11/02/2021 - Enhancing the Grant Searle Simple-Z80 32k computer with a M/C monitor
VIDEO OF THE ABOVE LINKS - The update is in three parts, first within the interrupt I/O driver the 'Warm or Cold?' signon message has been extended to 'Warm, Cold or Monitor?' and in the BASIC code, the command 'monitor' has been enabled. For the monitor itself I tried a different cross-assembler this time, AZ80, and I quite like it as it has no syntax peculiarities unlike some :-) With the addition of a monitor or 'bug' as they were known, the 32k 'Simple Z80' becomes a really handy little hobby computer with much more of a 'Nascommy' feel, and it presents the opportunity to try a few machine-code routines, hand-coded or cross-assembled elsewhere. I've had great fun with mine, thank you Grant for the design and Jeff for the gerbers!
A new rom image suitable for the 27C64 EPROM or as in my case an AT28B64 EEPROM is posted on http://philg.uk in the 'retro' section, along with a brief PDF document which details everything you see here.

- - - - Grant's CP/M on breadboard
Only 9 chips needed for a serial-only version with full 64K RAM and power-up ROM. Or only 8 chips if using a USB to TTL serial cable! 16K ROM, 64K RAM, Z80B @ 7.3728MHz or 3.6864MHz clock. Z80-SIO/2 115200, 57600, 38400 baud. Approx 250mA, CP/M 2.2.

- - - - Grant's CP/M on breadboard
Only 9 chips needed for a serial-only version with full 64K RAM and power-up ROM. Or only 8 chips if using a USB to TTL serial cable! 16K ROM, 64K RAM, Z80B @ 7.3728MHz or 3.6864MHz clock. Z80-SIO/2 115200, 57600, 38400 baud. Approx 250mA, CP/M 2.2.

Git - - - ZX2020
Yet another homebuilt Z80 Computer, but this one works without any FPGAs or Microcontrollers, but components that were available at the time when the Z80 processor was state of the art. With only five ICs it can run historic programs like Multiplan, Wordstar and MBasic, as well as some games. It now supports PATA drives.

- - - - Links: Projects, Hardware, Software, Homemade Z80 systems
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- - - - Official Support-Page: Hardware - Software - Utilities - FAQ - Docs for Z80-Family
The purpose of this page and its sub pages about members of Z80 family (and close relatives) is to collect and share information and good ideas. I know there are lots of people out there, who have developed some good utilities and hardware solutions. Now we all can share this infomation. This page contain docs, FAQs, source code, (cross-)assemblers, (cross-)compilers, utilities, etc. as well as links to other Z80 relevant stuff.

SCC - - - Small Computer Central - Home
This website is about retro computer technology from the late 70s and 80s. It is not about genuine commercial computers of that era, but about building with old technology.

G - - - RC2014-Z80 Google Groups
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Espressif - - - Arduino-esp32 Preferences API
The Preferences library is unique to arduino-esp32. It should be considered as the replacement for the Arduino EEPROM library. It uses a portion of the on-board non-volatile memory (NVS) of the ESP32 to store data. This data is retained across restarts and loss of power events to the system. Preferences works best for storing many small values, rather than a few large values. If large amounts of data are to be stored, consider using a file system library such as LitteFS. The Preferences library is usable by all ESP32 variants.

Espressif - - - Arduino-esp32 Preferences Tutorial
Storing and retrieving bool, char, uchar, string, float, etc

YT - - - Simplifying Data Storage with the Preferences Library for ESP32
In this video, we will show you how to use the Preferences library to easily store data on the ESP32 microcontroller. The Preferences library provides a simple and convenient way to store and retrieve key-value pairs in the non-volatile memory of the ESP32.

MCL - - - ESP32 Save Data to Flash Permanently using Preferences Library
In this tutorial, we will see how to store data in flash memory of ESP32 using the Preferences.h library and Arduino IDE. We can use this library to read and write data on the ESP32’s flash memory permanently. Flash memory is like a long-lasting memory that remembers things, so it’s perfect for saving important information. ESP32 consists of a flash memory that is non-volatile and can retain data after a reset or a power failure. By using preferences.h, this permanent storage feature is particularly useful for applications where we have to remember the last state of a variable, store some values for runtime or save any data for future use such as network credentials, API keys, etc.

YT - - - New Blynk with ESP32: WiFi Setup and LED Control using Preferences Library
Welcome to my latest tutorial on creating a smart home IoT project using the ESP32, Blynk, and the Preferences library! In this video, I'll demonstrate how to control three LEDs remotely through the Blynk app, and we'll also explore the secure storage of WiFi credentials using the Preferences library for easy network connectivity.

Espressif - - - Sending an Email Through IFTTT with Nano 33 IoT
Learn how to connect the Nano 33 IoT to IFTTT to send an email each time an action is performed. In this tutorial we will use an Arduino Nano 33 IoT, to send and email using an online automation tool that connects applications and services, named IFTTT.

Git - - - RC6502 Apple 1 SBC
Did you ever wonder what the first computer created by Apple was like, and then checked what getting one might cost? Well, only a few were made and those that still exist probably would cost you more than my car! Steve Wozniak built what would later be called the Apple I computer in his garage, using only common over the counter components the result was an interesting computer that still holds the imagination of many computer geeks to this day. I don't own a garage so I was limited by whatever I could do from the confines of my kitchen table, the RC6502 was what I came up with and with the files freely available on GitHub you can too!

ebay - - - RC6502 Apple 1 SBC PCB from ebay
PCB ordering option

Git - - - RC6502 Apple 1 Replica
Since building and spending time with the excellent RC2014 computer kit, I wanted to build another one from scratch while learning even more about them along the way. Combine that with the love of old machines I'll never be able to own, and the missing knowledge to actually do that I instead started looking for books on how things work on a more basic level.

Seems someone, Tow Owad ofcourse, wrote a book on called [ Apple 1 Replica Creation, Back to the garage ] on how to build an Apple 1 computer from scratch and made it freely available on http://www.applefritter.com/. Couldn't possibly find a more perfect match, so thank you for that Tom! Only thing missing was the PCBs, so with that in mind I set about designing them in KiCAD. Before long, the RC6502 Apple 1 Replica was born.