2 layers299.7 × 198.1 mm
Cisc-8
nailed-barnacle/Cisc-8-ttl-processor
A cut-down version of the 8080 processor using HCTTL and including a discrete ALU and instruction decoder
319 parts1MIT
2 layers88.8 × 114.5 mm
USB CopyNES
famicomical/USB_CopyNESKiCad 9 recreation of the Sealie USB CopyNES V4 (rev D), traced from the original PCB
- Size
- 88.8 × 114.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 35
- Nets
- 107
- Pads
- 327
- Tracks, vias
- 891, 28
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 18 Oct 2026
- Updated
- 18 Oct 2026
Overview
USB CopyNES is an open-source printed circuit board by famicomical, from the famicomical/USB_CopyNES repository on GitHub. It is a 2-layer board of 88.8 × 114.5 mm with 35 parts on 107 nets, routed with 891 tracks and 28 vias.
It is built around the 27C256-17/J, 74HC10D and 74HC138, with the 74HC157D, 74HC32D and 93LC46B/P among its other parts. Its parts include 12 capacitors, 8 resistors, 8 ICs, 3 connectors and 1 transistor. It belongs with the retro computing and games boards of this library.
Main components
727C256-17/J
-0℃~+70℃ 256Kbit 4.5V~5.5V EPROM Parallel Port (Parallel) - Non-Volatile Memory (ROM)Microchip TechnologyNon-Volatile Memory (ROM)
74HC10D
SO-14-40℃~+125℃ 1.5V~4.2V 16ns@6V,50pF 2V~6V 2uA 3 5.2mA 5.2mA 500mV~1.8V 74HC Series NAND Gate SOIC-14 Logic Gates ROHSNexperiaGates
74HC138
SOP-160℃~+70℃ 24ns@5.0V,16pF 2V~6V 3/8 5.2mA 5.2mA 5uA 74HC Decoder Reverse function Single Supply SOP-16 Signal Switches, Multiplexers, Decoders ROHSGRSignal Switches, Multiplexers, Decoders
74HC157D
SO-16-40℃~+125℃ 10ns@6.0V,50pF 160uA 2V~6V 5.2mA 5.2mA 74HC 8/4 Multiplexer Single Supply SOIC-16 Signal Switches, Multiplexers, Decoders ROHSNexperiaSignal Switches / Encoders & Decoders / Multiplexers74HC32D
SOP-14-40℃~+125℃ 1.5V~4.2V 1.9V、4.4V、5.9V 100mV、400mV、400mV 2 2V~6V 2uA 4 5.2mA 5.2mA 500mV~1.8V 6ns@6V,50pF 74HC Series OR Gate SOIC-14 Logic Gates ROHSNexperiaLogic Gates
93LC46B/P
PDIP-80℃~+70℃ 1Kbit 2.5V~5.5V 2MHz 6ms SPI PDIP-8 EEPROM ROHSMicrochip TechnologyEEPROM
FT2232D
LQFP48Dual USB UART / FIFO I.C.FTDIUncategorised
README
README.mdUSB CopyNES V4 (rev 2026)
KiCad 9 recreation of the Sealie USB CopyNES V4 (rev D), made by tracing the original PCB.
Changes
- U3 spare inputs grounded.
- R5 = 2.2k series / R6 = 10k pull-up, per FTDI reference design.
- Board is re-routed in KiCad (Freerouting, hand-cleaned) with a bottom-layer GND pour; copper does not match the original trace-for-trace. Edge cuts and the positions of J2 (USB) and J6 (cart header) match and were taken from real measurements.
Design notes
Memory map. CopyNES ROM at $1000-1FFF, $3000-3FFF and (PB0=1) $8000-FFFF; 6522 at $4800-4FFF. During those cycles U4/U3 force $4800-4FFF onto the NES bus so WRAM, PPU and cart stay off. ROM /CE = MUX_SEL & R/W & M2.
ROM. 27C256 with A13/A14 tied high; 8K used. ROM A12 = CPU A13.
6522 port B.
- PB0: cart override (1 = on)
- PB1: decoder enable (0 = play mode)
- PB2: WR
- PB3: EXP0 pad TP1. Flash-cart plugins strobe it; wire to NES cart pin 16 / expansion port pin 42 (Famicom has no EXP0).
- PB4: RD#
- PB5: RXF#
- PB6 (in): 1 = play, 0 = copy (RTS#)
- PB7: TXE#
PB2, PB4, PB5 and PB7 go to FT2232D channel A in 245 FIFO mode. All port B lines pulled up by R10.
FT2232D channel B. DTR# -> Q1 -> CPU /RST (R9 isolates NES /RST). RTS# -> PB6. DCD# <- NES VCC (host power check). FTDI runs from VBUS, rest of board from NES VCC.
Files
USB_CopyNES.kicad_pro/.kicad_sch/.kicad_pcb- KiCad 9 projectUSB_CopyNES.kicad_sym- project symbol library3dmodels/- USB-B connector 3D model
Parts
35| Qty | Value | Footprint | References |
|---|---|---|---|
| 9 | .1u | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C1, C2, C3, C4, C5, C6, C7, C8, C9 |
| 2 | 27 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2, R3 |
| 1 | 1.5k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R4 |
| 1 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R6 |
| 1 | 10n | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C14 |
| 1 | 10u | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C12 |
| 1 | 2.2k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R5 |
| 1 | 270 | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R9 |
| 1 | 27C256 | Package_DIP:DIP-28_W15.24mm | U14 |
| 1 | 2N4401 | Package_TO_SOT_THT:TO-92_Inline_Wide | Q1 |
| 1 | 33n | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C15 |
| 1 | 4.7k | Resistor_THT:R_Array_SIP10 | R10 |
| 1 | 470 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1 |
| 1 | 6.00M | Crystal:Resonator-3Pin_W10.0mm_H5.0mm | Y1 |
| 1 | 6522 | Package_DIP:DIP-40_W15.24mm | U1 |
| 1 | 74HC10 | Package_DIP:DIP-14_W7.62mm | U7 |
| 1 | 74HC138 | Package_DIP:DIP-16_W7.62mm | U6 |
| 1 | 74HC157 | Package_DIP:DIP-16_W7.62mm | U4 |
| 1 | 74HC32 | Package_DIP:DIP-14_W7.62mm | U3 |
| 1 | 93LC46B | Package_DIP:DIP-8_W7.62mm | U12 |
| 1 | AUDIO | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | AUDIO |
| 1 | Conn_02x20_Counter_Clockwise_2A03 | Package_DIP:DIP-40_W15.24mm | J6 |
| 1 | EXP0 | TestPoint:TestPoint_THTPad_D2.0mm_Drill1.0mm | TP1 |
| 1 | FT2232D | Package_QFP:LQFP-48_7x7mm_P0.5mm | U8 |
| 1 | USB_B | Connector_USB:USB_B_OST_USB-B1HSxx_Horizontal | J2 |
| 1 | ~ | Package_DIP:DIP-40_W15.24mm | J5 |
Questions
How big is the USB CopyNES PCB?
It measures 88.8 × 114.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the USB CopyNES use?
35 parts, built around the 27C256-17/J, 74HC10D, 74HC138 and 74HC157D. 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 USB CopyNES KiCad files?
From the famicomical/USB_CopyNES repository on GitHub, at the commit this page was made from: the board is USB_CopyNES.kicad_pcb and its schematic USB_CopyNES.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the USB CopyNES design in my own project?
Its repository states no licence, so its author keeps all rights: ask famicomical before reusing the design.
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