2 layers160 × 200 mm
Retro programmer
lynchaj/duodyne
Duodyne is a hobbyist retrocomputer system designed to run ROMWBW. It is comprised of modules on a system bus
209 parts15
2 layers235 × 80 mm
Front panel.processor
lynchaj/duodyne15Duodyne is a hobbyist retrocomputer system designed to run ROMWBW. It is comprised of modules on a system bus
- Size
- 235 × 80 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 48
- Nets
- 80
- Pads
- 208
- Tracks, vias
- 608, 19
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 16 Mar 2023
- Updated
- 27 Jul 2025
Overview
Front panel.processor is an open-source printed circuit board by lynchaj, from the lynchaj/duodyne repository on GitHub. It is a 2-layer board of 235 × 80 mm with 48 parts on 80 nets, routed with 608 tracks and 19 vias.
It is built around the ATTINY1614-SSN, 74LS240DC and TN0702N3-G. Its parts include 13 switches, 10 diodes, 5 resistors, 4 capacitors and 4 connectors. It belongs with the retro computing and games boards and the ESP32 and AVR (ATmega, ATtiny) boards of this library.
Main components
3
ATTINY1614-SSN
SOIC-14-40℃~+105℃ 1.8V~5.5V 10bit 12 16KB 20MHz 256Byte 2KB 8 Bit 8bit AVR Built-in FLASH SOIC-14 Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)74LS240DC
--55℃~+125℃ 1 15mA 18ns@5V,45pF 24mA 29mA 4.75V~5.25V 74LS Output enable Schmitt trigger Tri-State - Buffers, Drivers, Receivers, TransceiversTexas InstrumentsBuffers, Drivers, Receivers, Transceivers
TN0702N3-G
TO-92-31 N-channel 1V 1W 200pF 20V 500pF 530mA 5Ω@2V 60pF N-Channel TO-92-3 MOSFETs ROHSMicrochip TechnologyMOSFETs
README
README.mdduodyne
-
duodyne is a hobbyist retrocomputer system comprised of modules on a system bus. It is specifically designed to run RomWBW, however, provides support for multiple processor architectures and has a flexible and expandable system bus.
-
The system bus is designed to support multiple vintage or retro computer processor architectures such as those from Intel, Zilog, Motorola, Mostek, etc. The Z80 is the primary CPU used to develop the initial round of peripherals.
-
Duodyne borrows heavily from previous computer systems. The form factor is similar to S-100 and VME. The bus is electrically is derived from ECB with many extensions to support other processor architectures and improved power distribution. There are multiple pins for 5V and ground. +12V and -12V are supported. 3.3V and other values can be derived on board using voltage regulators.
-
The plan for the system is to have balance between functionality and complexity. A single function per board has good distribution and easy expansion but leads to many boards and a large backplane which can lead to electrical and signal distribution issues. However, full integration into a single board computer reduces complexity somewhat but can make expansion difficult.
-
Duoodyne's bus based approach with a generous board form factor allows for a blend of integration and distribution of two or more functions per board leading to a smaller overall backplane yet retaining flexibility for easy expansion.
-
The duodyne core system is defined as an 4-slot or 8-slot backplane, a Z80 or other processor (currently, Z80, 65C816, and TMS9995 are supported), and a ROMRAM board. The ROMRAM memory board assumes an 8-bit data bus so CPU's with larger data busses may require dedicated memory boards. The Z80 processor includes a debugging serial port for console access. The boot ROM is included on the ROMRAM board.
Parts
48| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | SW_SPDT | SW_Toggle_Blue_wSlots:SW_Toggle_Blue_wSlots | SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8, SW10, SW11, SW12, SW13 |
| 9 | LED | LED_THT:LED_D3.0mm | D1, D2, D3, D4, D5, D6, D7, D8, D9 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3_Pad | H1, H2, H3, H4 |
| 2 | 0.1u | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C1, C5 |
| 2 | 10K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2 |
| 2 | 10u | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C3, C4 |
| 2 | TN0702 | Package_TO_SOT_THT:TO-92_HandSolder | Q1, Q2 |
| 1 | 220 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3 |
| 1 | 470 | Resistor_THT:R_Array_SIP9 | RN1 |
| 1 | 470 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R6 |
| 1 | 4700 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R4 |
| 1 | 74LS240 | Package_DIP:DIP-20_W7.62mm | U1 |
| 1 | ATtiny1614-SS | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U4 |
| 1 | BI-COLOR LED | LED_THT:LED_D5.0mm | D10 |
| 1 | FPANEL | Connector_IDC:IDC-Header_2x20_P2.54mm_Horizontal | J1 |
| 1 | LP2950-3.3_TO92 | Package_TO_SOT_THT:TO-92_HandSolder | U3 |
| 1 | MICRO SD CARD | Adafruit MicroSD Module:Adafruit MicroSD Module | J3 |
| 1 | NetTie_2 | NetTie:NetTie-2_THT_Pad0.3mm | NT1 |
| 1 | SSD1306 | SSD1306:128x64OLED | Brd1 |
| 1 | SW_Push | Button_Switch_THT:SW_PUSH_6mm | SW9 |
| 1 | TTL SERIAL | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Horizontal | J2 |
| 1 | UPDI ONLY | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Horizontal | J4 |
Questions
How big is the Front panel.processor PCB?
It measures 235 × 80 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Front panel.processor use?
48 parts, built around the ATTINY1614-SSN, 74LS240DC and TN0702N3-G. 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 Front panel.processor KiCad files?
From the lynchaj/duodyne repository on GitHub, at the commit this page was made from: the board is !Development/12 front-panel.processor, V1.1/front-panel.processor.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Front panel.processor design in my own project?
Its repository states no licence, so its author keeps all rights: ask lynchaj before reusing the design.
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