This board helps test floppy drives of several different types:
- Standard IBM 34-pin drives (3.5" and 5.25")
- IBM PS/2 40-pin drives with embedded power connections
- Shugart 8" floppy drives
- Apple II (original Disk II)
- HP 34-pin drives (as found in many 9122 enclosures)
- HP 26-pin drives (found in older enclosures and machines)
- IBM 31SD and 51TD floppy drives
The board basically breaks out every signal to a control switch, indicator LED, or test point. It's not designed as a flux imaging tool--it's just a simple way to exercise features of a floppy drive.
There is an optional section of the board that is a step controller for the head stepper motor. This controller has an encoder wheel and a small 7-segment display. It will let you select and automatically step to a particular track.
Uses an ATmega328PB microcontroller as its CPU.
This repository contains STL files for the MicroLab 3D printed reactors.
The MicroLab is an open-source, DIY, automated controlled lab reactor (CLR) that people can assemble with parts available online. We hope this will do for chemistry what the 3D printer did for manufacturing: provide a DIY, hackable, low-cost method to design and produce certain needful things that otherwise would be out of reach.
For the MicroLab to be accessible to the most people, it was developed as part of a hardware/software stack called the MicroLab Suite. The different software programs help take the information about a compound you want to make and translate it into a recipe (code) that the MicroLab runs to create the compound.
This section is for you if you want to build a MicroLab and start using it. We tried to make building the MicroLab friendly for folks newer to electronics, but you will need some knowledge and skills with electronics (or the patience to learn a few things).
Extensive documentation in the repository.
AtomGPS Wigler is a wardriving tool originally created by @lozaning. For use with the M5Stack Atom GPS kit, this tool is specifically designed for Wi-Fi network geolocation. LED status indicators are outlined below. Wigle compatible CSV files are written to SD.
Requires an M5 AtomGPS unit, an SD card, and the Arduino IDE or Esptool.py to flash the firmware.
All In One Cable For Ham Radio transceivers including Baofeng, Quansheng and many other makes of portable HT transceivers. This adapter incorporates thee functions: A USB sound card to convert the receive/transmit audio from the transceiver to USB, a USB to serial adapter to allow programming of your transceiver from radio software such as CHIRP, and PTT control to allow automatic receive & transmit using either serial port settings (DTR & CTS) or the CM108 standard supported by popular software (including Dire Wolf.) You can use this for APRS, Packet Radio, Winlink, Programming or any other sound card data mode.
Compatible with all portable radios that use the Kenwood Style connector.
A troubleshooting cheatsheet for the Commodore 1541 floppy drive.
An open-source hacking hardware platform based on the RP2040 with RF, NFC, USB, and SD card ready for pen testing research. Sort of like a Flipper Zero, only much easier to get hold of and more flexible because it's more easily programmable. However, there is not yet a software ecosystem so you're pretty much on your own for writing firmware and a user interface right now. The biggest trick is that it's all surface mount components, just about no through-hole parts. If you order through JLCPCB, though, it looks like you can also upload a bill of materials and they'll assemble it for you.
Every item is for either your Commodore PET, VIC-20, C64, C64c, SX-64, C16, Plus/4, C128 or C128D. Every product is currently commercially available or coming soon. That means that while you browse this guide, if you see something cool you can order it and have one for yourself.
The items are grouped into 12 broad categories and subgrouped thematically to help you find that expansion for your Commodore 8-bit that you never even knew existed, without first needing to know who makes or sells it.
Some items have feature pages, and more feature pages will be added over time. A feature page describes the primary function and use of the product, shows up-close photographs, lists the models of Commodore it is compatible with and links to the product's homepage and documentation. It also lists prices and gives clear instructions about how you can order it. The feature pages open up comments for the community to leave reviews, and to ask and answer questions.
How to hack a microSD-to-SD card adapter to work with a 3.3 volt microcontroller.
TeensyROM is a ROM emulator, fast loader, MIDI and Internet cartridge for the Commodore 64/128 based on the Teensy v4.1 microcontroller board. TeensyROM now supports an NFC Loading System. Just tap an NFC tag on a reader to start any program. Designed with medium soldering skills in mind.
Load disk images, PRGs, P00s, CRTs from flash drive, on-board flash storage, microSD card, or across the network. Plug a MIDI device into the USB port and play your SID chip in realtime; works with many composition and sequencing packages. Works with modern Commodore networking software, emulates a modem for terminal emulators. Configuration stored in on-board non-volatile storage.
Mythic Beasts is a privately owned hosting ISP with a focus on providing services to technically capable customers. Started in 2000 by a group of Oxford and Cambridge University graduates who were dissatisfied customers of other shared hosting providers, we began offering shell accounts on a single shared host as a hobby project. This grew over many years. As we’ve grown from a single server to having facilities in six data centres in Europe and North America, we’ve taken on our first full rack in London, a second London site, out-of-London colocation and hosting in Cambridge, a presence in a third London data centre, racks in Amsterdam and California, and moved our third London site to Shoreditch.
This Github is created to share knowledge about data diodes, also known as unidirectional gateways, to a wider audience. The data diode concept of unidirectional traffic is easy to understand but we noticed that when starting with the data diodes in the real world there are some barriers to overcome. This workshop will help you to start with the basic concept of data diodes while keeping the costs to a minimum.
The A2 VidGA is a super handy, wide-support VGA output card for your Apple ][, ][+ and //e computer!
The Apple II’s composite video output is not exactly standard. Some newer monitors don’t like it, and old CRTs can be inconvenient. The A2 VidGA card solves that problem! The A2 VidGA includes a standard VGA output port, but with a twist. With a simple modification (which you can do yourself, or purchase pre-installed) you can separate the VGA port and attach it to the rear panel of your Apple II – no weird adapters to purchase. It’s an all-in-one solution!
Based on the original Apple II VGA project by Mark Aikens and the update by Vince Briel, our version aims to be the most cost-effective pre-assembled version on the market.
This guide will explain some ways to set up a VoIP ATA so that you can place calls between computers with modems (although any other pair of telephone devices will work.) When done, you will be able to:
- Connect two or more computers with modems directly together using a single ATA
- Connect a computer with a modem to another computer and modem elsewhere in your house over your LAN using two ATAs
- Connect a computer with a modem to another one in someone else's house over the internet
Note that this does NOT involve setting up Asterisk!
The LoongArch architecture is an Instruction Set Architecture (ISA) that has Reduced Instruction Set Computer (RISC) style. The LoongArch Reference Manual is used to explain the LoongArch specification.
LoongArch has the typical characteristics of RISC. LoongArch instructions are of fixed size and have regular instruction formats. Most of the instructions have two source operands and one destination operand. LoongArch is a load-store architecture; this means only the load/store instructions can access memory the operands of the other instructions are within the processor core or the immediate number in the instruction opcode.
LoongArch is divided into two versions, the 32-bit version (LA32) and the 64-bit version (LA64). LA64 applications are “application-level backward binary compatibility” with LA32 applications. That means LA32 applications can run directly on the machine compatible with LA64, but the behavior of system softwares (such as the kernel) on the machine compatible with LA32 is not guaranteed to be the same as on the machine compatible with LA64.
LoongArch is composed of a basic part (Loongson Base) and an expanded part, as shown in the figure. The expansion part includes Loongson Binary Translation (LBT), Loongson VirtualiZation (LVZ), Loongson SIMD EXtension (LSX), and Loongson Advanced SIMD EXtension(LASX).
License: CC BY-NC-ND v4.0 International
Intel 8086 monitor program that fits in a single boot sector.
I've reverse engineered the power board from a Thinkpad 700C. The P/N is 35G4785, and the FRU number is 48G3712. A very similar or identical board is also present in the Thinkpad 700. The schematic isn't perfect. Open a bug report if you find a mistake. Not all components were identified. A number of parts did not have designators on the silkscreen, so I assigned them new ones starting at 300.
The circuit board has four layers and an aluminum core, presumably for heat dissipation.
Do not fabricate this design. The PCB layout is for reference only. There are ground plane cuts in layer User.9 that need to get transferred to the ground plane. There are minor footprint differences as well. There are still unidentified components in the bill of materials.
This site is dedicated to cataloging and sharing information on repairing devices. It's named "Caps" wiki because in older electronics capacitors are one of the more common causes of problems. But any repair information such as ICs, batteries, belts, 3D printer models, or more for devices of any age is welcome here!