55 total results found
Information about the Mega Drive/Genesis console, its add-ons, peripherals, and software created for these systems.
A collection of all hardware related projects.
Mega Drive Hardware
Information related to the Sega Mega Drive/Genesis console's hardware
Notes from various reverse engineering projects
Emulashione is a multi-platform emulation framework focused on accuracy and portability.
68komputer is a homebrew computer based around the Motorola 68000 processor, and an ecosystem of peripherals and software to go with it.
A DIY programmable load, intended for power supply and battery testing
Wireless protocol for home automation
Documentation on the hardware, firmware, and Bluetooth protocol used by the Pax Era, Era Pro, and Pax 3 vaporizers by Pax Labs.
Information on the core emulation library, which implements plugin management, system handling and synchronization of multiple devices.
68000 CPU Board
The standard 68komputer processor board, featuring 1MB of 0 wait state SRAM and flash, 32K of NVRAM + RTC, a 68681 DUART, I2C controller, and dual SAA1099 PSG’s.
Cards are interconnected via a simple backplane. Together with a management card, the backplane provides power, bus control signals, out of band signaling and support for per card audio outputs.
Provides +5V and +12V power and supervision for backplane, and audio output.
The thing that runs the show
Front and rear panels
Separate board to actually do the load operations, with MOSFETs or whatever else
Information about the remote control interface of the load, including the underlying protocol, and differences between supported transports.
A new and improved controller for the programmable load, based around an STM32MP1 dual Cortex A7/M4F.
Description of the wireless protocol used to communicate with devices
Notes on the first revision coordinator hardware and software
This chapter outlines the encoding/format of various packets.
This is mostly based off of reading the slightly deobfuscated source code of the Pax WebApp and Bluetooth packet logs. All messages for controlling the device seem to go through a single service with UUID 8E320200-64D2-11E6-BDF4-0800200C9A66. Of interest is a...
This is a list of all message types as extracted from the Pax mobile application. The names are identical to what the app calls them. Name Description ID Era Pax 3 Read Write Read Write ATTRIBUTE_ACTUAL_TEMP Actual temperature of t...
A system’s devices, busses, clock sources, and connections between all of these are defined in system definitions, human readable TOML structures. Most items defined in the definition have an associated name, specified in the name key. This name is unique to ...
This page attempts to capture some of the ideas behind how the emulator is implemented, and how it in turn enables devices to be implemented to emulate actual hardware. Devices can be emulated in one of two major ways: either by having the emulation core step...
Using 96 position (3x32) DIN 41612 connectors; right angle male on expansion cards, vertical female on the backplane side. The management card uses a 48 position (3x16) DIN 41612 (C2) right angle male connector, with the corresponding vertical female on the ba...
Rev1 Assembly Notes
Debug board F202 footprint appears to be too large for the fuse ordered (NANOSMDC050F/13.2-2) F201 is actually 1.1A, not 1.5A as the schematics indicate Caps under Teensy (C316/C317) could use with being moved a bit U508/U509 package sucks ass C512/C51...
Unlike other expansion boards, this one is required to operate the backplane, primarily to power the system. To connect, it uses a smaller half height (48 position, 3 row) DIN 41612 connector with a unique pinout to interface to the backplane. Additionally, it...
6 Slot Backplane
A backplane which supports up to six expansion cards, meant to go into a 3U VME crate. Features Direction-controlled buffers for address and data bus Mixer for audio from CPU board and expansion slots Detection of installed peripheral cards via detect ...
Peripherals can be connected to the CPU board through the expansion connector, a 96-pin, 3 row DIN41612 right angle connector. Pinout A B C 1 +5V GND +12V 2 +5V GND +12V 3 I2C_SCL1 /I2C_IRQ1 I2C_SDA1 4 GND GND GND ...
This page lists any assembly remarks and issues with each revision of the board. Rev 1 5V power module (U302) sync input should be grounded, to use internal sync. Move capacitors out from under the 5V power module; it causes interference issues Annular r...
CAN0: Expansion PA22 (TX), PA23 (RX) SERCOM0: I2C, front panel/rear IO (through mux) IOSET1 PA8 (SDA, PAD0), PA9 (SCL, PAD1) SERCOM2: I²C, analog board PA12 (SDA, PAD0), PA13 (SCL, PAD1) SERCOM3: SPI, analog board IOSET1 PA16 (...
The front panel features a few buttons, indicators, and a rotary encoder. Overview Note that the actual front panel board only covers the right third of the actual front panel: the area with the push buttons, indicators, and rotary encoder. It's mounted to...
On the rear of the device are a few auxiliary connections, including AC power input, communications (Ethernet, USB) and an external trigger input. Rear panel, as viewed from front (inside) Power A cutout is provided for an IEC mains filter/input module wi...
DMA Channel Allocations
DMAC should operate with dynamic, round-robin priority arbitration within a DMA priority level. Priority levels listed are from 0 (highest) to 3 (lowest.) Ch0: NOR flash SPI Tx empty (SERCOM5) Priority: 2 Operate in SPI 32 bit data mode Burst transfers...
Clock Inputs All clocks on the system are derived from one of the following clock inputs (oscillators and internal generators:) Crystals XOSC1: External 12MHz oscillator Provides primary system clock reference XOSC32K: External 32.768kHz oscillato...
This page lists some issues with CPU board hardware, as they are discovered, and some workarounds. Rev 1 /I2C_IRQ's external IRQ line conflicts with ENCODER_A Move /I2C_IRQ from PA7 to PA10 Rework required: solder line from pin 11 (/IRQ) of U101 to mid...
This page lists some issues with the hardware. Rev 2 Holes for current sense resistors should be slightly larger Datasheet specifies 1.5mm ±0.12mm Increase spacing between heatsink and MOSFET/resistor slightly Right now, the legs need to be bent...
The driver boards need to have done to work. Rev 1 Current driver zero offset Trimmers: RV301, RV302 This adjustment controls the zero offset of the current sense amps. Connect the load to a (current limited) power supply, with a current meter in line. Ens...
Front Panel Errata
Rev 1 Mode/load switches footprints need soldermask pulled back from pads The pads are covered by soldermask. This is bad
Rear IO Errata
Rev 1 Copper rings around USB connector pads should be larger Retention holes for Ethernet jack should be slightly smaller (to accommodate push-in expansion action for mechanical stability)