OpenTendo
OpenTendo is an open source PCB design by Redherring32: a 2-layer, 196.3 × 118.7 mm board with 93 components (51 distinct parts). It is built around the 6116 (WRAM), 74HC373, 74HC139, 6116 (VRAM) and more. Filed under retro computing.
An Open-Source HardWare (OSHW) recreation of the original 1985 front-loading NES Motherboard
Neither RGB nor HDMI video output were or are a goal of the OpenTendo project, the goal was/is documentation and preservation, and the project was an exercise in reverse engineering. As such "improved" video outputs will not be added to OpenTendo.
NESRGB and Hi-Def NES can be installed as normal, but will not be incorporated into the OpenTendo PCB
The gerber files required to order PCBs can be found under releases.
Built around
Parts list
93 components, 51 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 6116 (WRAM) | DIP-24_W15.24-7.62mm | U1 |
| 1 | 74HC373 | DIP-20_W7.62mm | U2 |
| 1 | 74HC139 | DIP-16_W7.62mm | U3 |
| 1 | 6116 (VRAM) | DIP-24_W15.24-7.62mm | U4 |
| 1 | RP2C02 PPU | DIP-40_W15.24mm | U5 |
| 1 | RP2A03 CPU | DIP-40_W15.24mm | U6 |
| 1 | 40H368 (CI) | DIP-16_W7.62mm | U7 |
| 1 | 40H368 (CII) | DIP-16_W7.62mm | U8 |
| 1 | 74LS04 | DIP-14_W7.62mm | U9 |
| 1 | CIC | DIP-16_W7.62mm | U10 |
| 1 | 2SA937 | TO-126-3_Vertical_Short | Q1 |
| 2 | 2SC2021 | TO-126-3_Vertical_Short | Q2, Q3 |
| 1 | 21.477272 MHz | Crystal_HC49-U_Horizontal_1EP_style2 | X1 |
| 1 | 4MHz | Resonator_Murata_CSTLSxxxG-3Pin_W8.0mm_H3.0mm | X2 |
| 1 | 72-Pin Connector | NES_Edge_Connector | P1 |
| 1 | EXP-Connector | EXP_Header | P2 |
| 1 | MOD RF | Mod_RF | P3 |
| 2 | Controller Input | JST_PH_S7B-PH-K_1x07_P2.00mm_Horizontal | P4, P5 |
| 1 | PWR/RST IN | PowerReset-switch-In | P6 |
| 2 | 103-25 | C_Disc_D6.0mm_W2.5mm_P5.00mm | BC1, BC2 |
Show 31 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | DAN601 | R_Array_SIP7 | DA1, DA3 |
| 2 | UPA64H | R_Array_SIP7 | DA2, DA4 |
| 1 | 39uH | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | FC1 |
| 1 | Ferrite_Coil | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | FC2 |
| 1 | 12 x 10K | R_Array_SIP13 | RA1 |
| 1 | 4 x 6.8K | R_Array_SIP5 | RA2 |
| 1 | 30pF | TrimmerCap-THT | TC1 |
| 2 | ? | D_DO-35_SOD27_P10.16mm_Horizontal | D1, D2 |
| 1 | 100uF | CP_Radial_D5.0mm_P2.50mm | C1 |
| 20 | 10nF | C_Disc_D5.0mm_W2.5mm_P5.00mm | C2, C3, C4, C10, C11, C12, C13, C14 +12 |
| 1 | 330pF | C_Disc_D3.0mm_W2.0mm_P2.50mm | C5 |
| 2 | 100nF | C_Disc_D7.0mm_W2.5mm_P5.00mm | C8, C46 |
| 1 | 2.2uF | CP_Radial_D5.0mm_P2.50mm | C9 |
| 3 | 220pF | C_Disc_D3.0mm_W1.6mm_P2.50mm | C20, C21, C44 |
| 1 | 1uF | CP_Radial_D5.0mm_P2.50mm | C23 |
| 10 | 330pF | C_Disc_D3.0mm_W1.6mm_P2.50mm | C27, C28, C29, C30, C31, C33, C34, C35 +2 |
| 1 | 18pF | C_Disc_D3.0mm_W2.0mm_P2.50mm | C41 |
| 1 | 15pF | C_Disc_D3.4mm_W2.1mm_P2.50mm | C42 |
| 2 | 51pF | C_Disc_D3.4mm_W2.1mm_P2.50mm | C43, C45 |
| 1 | 1M | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1 |
| 2 | 510 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2, R12 |
| 2 | 100 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R3, R4 |
| 1 | 220 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R5 |
| 1 | 47K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R6 |
| 2 | 20K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R7, R9 |
| 1 | 12K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R8 |
| 1 | 220K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R10 |
| 1 | 1.2K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R11 |
| 1 | 150K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R13 |
| 1 | 2.2K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R17 |
| 2 | 1K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R18, R19 |
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