4 layers271.8 × 147.3 mm
2 layers188 × 66 mm
Floppy
scefrom/SF682A board featuring the Motorola 68000
- Size
- 188 × 66 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 48
- Nets
- 126
- Pads
- 508
- Tracks, vias
- 1,170, 208
- Pours
- 5
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 15 Jul 2025
- Updated
- 20 Sep 2026
Overview
Floppy is an open-source printed circuit board by scefrom, from the scefrom/SF68 repository on GitHub. It is a 2-layer board of 188 × 66 mm with 48 parts on 126 nets, routed with 1,170 tracks and 208 vias.
It is built around the 74HC541D, 74HC574D and 74HC02, with the 74HC05D, 74HC139D and 74HC14 among its other parts. Its parts include 22 capacitors, 14 ICs, 6 resistors, 3 connectors and 1 crystal.
Main components
10
74HC541D
SO-20-300mil-40℃~+125℃ 1 12ns@4.5V,50pF 160uA 2V~6V 7.8mA 7.8mA 74HC 8 Output enable Tri-State Unidirectional SO-20-300mil Buffers, Drivers, Receivers, Transceivers ROHSNexperiaBuffers, Drivers, Receivers, Transceivers74HC574D
SOP-20L-40℃~+125℃ 1 13ns 15ns@6V,50pF 2.7V~6V 20uA 28MHz 5ns 6.5pF 7.8mA 7.8mA 74HC Series 8 D-Type Enable Rising Edge Tri-State SOP-20L Flip Flops ROHSMDDFlip Flops74HC02
-- Logic Gates ROHSonsemiLogic Gates
74HC05D
SOP-14-40℃~+125℃ 1 1.5V~4.2V 15ns@6V,50pF 2V~6V 2uA 5.2mA 500mV~1.8V 6 74HC SOIC-14 Inverters ROHSNexperiaInverters
74HC139D
SO-16-40℃~+125℃ 11ns@6.0V,50pF 160uA 2/4 2V~6V 74HC Decoder Single Supply SOIC-16 Signal Switches, Multiplexers, Decoders ROHSNexperiaSignal Switches / Encoders & Decoders / Multiplexers74HC14
SOP-14-40℃~+85℃ 1.9V、3.98V、4.4V、5.48V、5.9V 100mV、260mV、260mV 20uA 25ns@4.5V,50pF 2V~6V 6 74HC Noise suppression function Schmitt trigger SOP-14 Inverters ROHSJSMSEMIInverters74HC688D
SOIC-20-300mil-40℃~+125℃ 0.1V 0.5V、1.35V、1.8V 1.2V、2.4V、3.2V 1.9V、4.4V、5.9V 160uA 16ns@6.0V,50pF 2V~5V SOIC-20-300mil Digital Comparators ROHSNexperiaDigital Comparators
74HC75D
SOIC-16-40℃~+125℃ 12ns 12ns 160uA 2V~6V 3ns 4 5.2mA 5.2mA 74HC Complementary D Latch SOIC-16 Latches ROHSNexperiaLatches
SF2202E
SMD3030-6P2.0175GHz 2.9dB SMD3030-6P SAW Filters ROHSMurataSAW Filters
SF2203E
SMD3030-6P4dB 834MHz SMD3030-6P SAW Filters ROHSMurataSAW Filters
Parts
48| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | 100n | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.54mm | C2, C7, C8, C9, C10, C11, C12, C13, C14, C17, C20, C22 |
| 5 | 100n | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P7.62mm | C3, C4, C5, C15, C16 |
| 5 | 74HC574 | Package_DIP:DIP-20_W7.62mm | U7, U8, U9, U10, U11 |
| 4 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R2, R3, R5, R6 |
| 2 | 10u | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C6, C19 |
| 2 | 22p | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.54mm | C1, C18 |
| 2 | 4k7 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R1, R4 |
| 1 | 16MHz | Oscillator:Oscillator_DIP-8 | Y1 |
| 1 | 1k | Resistor_THT:R_Array_SIP5 | RN1 |
| 1 | 220p | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.54mm | C21 |
| 1 | 74HC02 | Package_DIP:DIP-14_W7.62mm | U5 |
| 1 | 74HC05 | Package_DIP:DIP-14_W7.62mm | U14 |
| 1 | 74HC139 | Package_DIP:DIP-16_W7.62mm | U4 |
| 1 | 74HC14 | Package_DIP:DIP-14_W7.62mm | U13 |
| 1 | 74HC541 | Package_DIP:DIP-20_W7.62mm | U6 |
| 1 | 74HC688 | Package_DIP:DIP-20_W7.62mm | U12 |
| 1 | 74HC75 | Package_DIP:DIP-16_W7.62mm | U3 |
| 1 | MountingHole_3.2mm_M3_DIN965_Pad | MountingHole:MountingHole_3.2mm_M3_DIN965_Pad | M1 |
| 1 | SF2202 | Package_LCC:PLCC-44_THT-Socket | U1 |
| 1 | SF2203 | Package_LCC:PLCC-84_THT-Socket | U2 |
| 1 | driveint | Connector_IDC:IDC-Header_2x17_P2.54mm_Horizontal | J1 |
| 1 | perslota | Connector_PCBEdge:edge_connector_30p_2.54mm | J3 |
| 1 | perslotb | Connector_PCBEdge:edge_connector_15p_2.54mm | J2 |
Questions
How big is the Floppy PCB?
It measures 188 × 66 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Floppy use?
48 parts, built around the 74HC541D, 74HC574D, 74HC02 and 74HC05D. 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 Floppy KiCad files?
From the scefrom/SF68 repository on GitHub, at the commit this page was made from: the board is floppy/floppy.kicad_pcb and its schematic SF68.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Floppy design in my own project?
Its repository states no licence, so its author keeps all rights: ask scefrom before reusing the design.
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