4 layers40 × 60 mm
Control board v2.0
0x23/nmWave-Interferometer
An Open Source Interferometer for Accurate Distance Measurements
106 parts151MIT
2 layers72.6 × 65.5 mm
Floppy controller and disk emulator for the TRS-80 Model 1
- Size
- 72.6 × 65.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 26
- Nets
- 80
- Pads
- 281
- Tracks, vias
- 627, 64
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 2 Nov 2024
- Updated
- 19 Oct 2026
Overview
FDC is an open-source printed circuit board by MichaelM4, from the MichaelM4/Floppy80-M1 repository on GitHub. It is a 2-layer board of 72.6 × 65.5 mm with 26 parts on 80 nets, routed with 627 tracks and 64 vias.
It is built around the PMEG4010CEJ. Its parts include 9 capacitors, 6 resistors, 5 ICs, 2 diodes and 2 transistors. It belongs with the RP2040 boards of this library.
Main components
1README
README.mdFloppy 80 for the TRS-80 Model I
Features
The Floppy-80 is a Hardware and software solution that emulates the following features of the Expansion Interface
- A Floppy Disc controller
- supports 3 floppy drives
- single and double-density
- single and double-sided
- up to 90 cylinders
- DMK disk format supported
- 32k RAM expansion (optional)
- 40Hz RTC interrupt generation
Additionally, the following features are provided:
- A Hard Disk Controller (optional)
- supports up to 2 hard drives
- Uses same image format as FreHD
- Wait State Generation (optional)
- Software Debugging Interface
An SD card is required to store disk images and configuration data
Hardware
The Floppy-80 consists of a board that connects to the Model-1 expansion edge connector. The board contains an SD card socket to provide disk images and a Raspberry Pi Pico 2 microcontroller which does the emulation
Building and testing the board is covered separately.
Software
The software provided includes 2 main components
- Firmware running on Raspberry Pi, that provides the emulation
- FDC Utility (TRS DOS, and CPM) running on TRS-80 for emulator control
See the separate Software Build Guide for details on building the Floppy-80 software
User Guide
For User Instructions please see the separate User Guide
Credits
Resources
Parts
26| Qty | Value | Footprint | References |
|---|---|---|---|
| 9 | 100nF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C2, C3, C4, C5, C6, C7, C8, C9 |
| 5 | 1k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R2, R3, R4, R6, R8 |
| 4 | SN74LVCC4245ADWR | Package_SO:SOIC-24W_7.5x15.4mm_P1.27mm | U1, U3, U4, U5 |
| 2 | SSM3K324RLFCT-ND | Package_TO_SOT_SMD:SOT-23_Handsoldering | Q1, Q2 |
| 1 | 100 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1 |
| 1 | Conn_02x20_Odd_Even | Connector_PinSocket_2.54mm:PinSocket_2x20_P2.54mm_Vertical | J2 |
| 1 | LED | LED_SMD:LED_2816_7142Metric_Pad3.20x4.45mm_HandSolder | D1 |
| 1 | PMEG4010CEJ | Diode_SMD:D_SOD-323F | D2 |
| 1 | Pico | MCU_RaspberryPi_and_Boards:RPi_Pico_SMD_TH | U2 |
| 1 | SD_Card | Connector_Card:SD_Kyocera_145638009511859+ | J3 |
Questions
How big is the FDC PCB?
It measures 72.6 × 65.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the FDC use?
26 parts, built around the PMEG4010CEJ. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the FDC KiCad files?
From the MichaelM4/Floppy80-M1 repository on GitHub, at the commit this page was made from: the board is KiCAD/FDC.kicad_pcb and its schematic KiCAD/FDC.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the FDC design in my own project?
Its repository states no licence, so its author keeps all rights: ask MichaelM4 before reusing the design.
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