NuXT
About the NuXT PCB
NuXT is an open source PIC PCB design by monotech, published on GitHub under the GPL-3.0 license. It is a 4-layer board measuring 184.9 × 243.8 mm, with 214 components from 87 distinct parts.
Its main chip is the PIC12F629, from the PIC family. Other key parts include the 8088, 8087, SST39SF010A, AS6C4008 and FE2010A. By type, the board carries 88 capacitors, 43 resistors, 37 ICs, 10 diodes, 9 inductors and 8 connectors.
From the project
MicroATX Turbo XT Motherboard, with VGA, Floppy, CF, Serial
Based on schematics by Sergey Kiselev, with some small changes for combining optimization and board layout efficiency:
http://www.malinov.com/Home/sergeys-projects/isa-fdc-and-uart
http://www.malinov.com/Home/sergeys-projects/xt-cf-lite
http://www.malinov.com/Home/sergeys-projects/isa-supervga
https://github.com/skiselev/isa8_backplane
Main components on the NuXT
NuXT bill of materials (BOM)
214 components, 87 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 8088 | DIP-40_W15.24mm_Socket | U1 |
| 1 | 8087 | DIP-40_W15.24mm_Socket | U2 |
| 1 | SST39SF010A | DIP-32_W15.24mm_Socket | U3 |
| 2 | AS6C4008 | SSOP-32_11.305x20.495mm_P1.27mm | U4, U5 |
| 1 | FE2010A | PLCC-84_THT-Socket | U6 |
| 1 | ATF16V8B | DIP-20_W7.62mm_Socket | U7 |
| 2 | 74F11 | DIP-14_W7.62mm | U8, U34 |
| 1 | PIC12F629 | DIP-8_W7.62mm_Socket | U9 |
| 3 | 74F573 | DIP-20_W7.62mm | U10, U11, U12 |
| 2 | 74F245 | DIP-20_W7.62mm | U13, U14 |
| 2 | 74F244 | DIP-20_W7.62mm | U15, U16 |
| 1 | 74LS14 | DIP-14_W7.62mm | U17 |
| 1 | 74LS74 | DIP-14_W7.62mm | U18 |
| 1 | 7905 | TO220-3_Soldertab | U19 |
| 1 | TVGA9000i | PQFP-160_28x28mm_P0.65mm_LongPads | U20 |
| 1 | 27C256 | DIP-28_W15.24mm_Socket | U21 |
| 4 | 256Kx4 70ns | DIP-20_W7.62mm_Socket | U22, U23, U24, U25 |
| 2 | 74LS688 | DIP-20_W7.62mm | U26, U36 |
| 1 | 74F04 | DIP-14_W7.62mm | U27 |
| 1 | 74F32 | DIP-14_W7.62mm | U28 |
Show 67 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 82077AA/PC8477 | PLCC-68_THT-Socket | U29 |
| 1 | 16(C)x50 | PLCC-44_THT-Socket | U30 |
| 1 | GD75232/75(C)185 | DIP-20_W7.62mm | U31 |
| 2 | 74LS138 | DIP-16_W7.62mm | U32, U33 |
| 1 | 28C64B/28C256 | DIP-28_W15.24mm_Socket | U35 |
| 1 | 74F138 | DIP-16_W7.62mm | U37 |
| 1 | PNP EBC | TO-92_Wide | Q1 |
| 1 | 28.63636MHz | Crystal_HC49-4H_Vertical | X1 |
| 1 | 40MHz | Crystal_HC49-4H_Vertical | X2 |
| 1 | 1.8432MHz TTL | Oscillator_DIP-14 | X3 |
| 1 | 24MHz | Crystal_HC49-4H_Vertical | X4 |
| 1 | 1.8432MHz | Crystal_HC49-U_Vertical | X5 |
| 1 | Front Panel | PinHeader_2x05_P2.54mm_Horizontal | P1 |
| 1 | Speaker | PinHeader_1x04_3Loaded_P2.54mm_Horizontal | P2 |
| 1 | ATX Power | Molex_Mini-Fit_Jr_5569-20A2_2x10_P4.20mm_Horizontal | P3 |
| 1 | Floppy | Pin_Header_Straight_2x17_Pitch2.54mm_shrouded | P4 |
| 1 | PS/2 Keyboard | Conn_Mini_DIN_6pin | P5 |
| 1 | Serial Port | Conn_Dsub_DE9M | P6 |
| 1 | VGA Port | DSUB-15-HD_Female_Horizontal_CONNFLY_DS1308 | P7 |
| 1 | CF_CARD | CF_Slot_3M_N7E50-7516TS0884 | P8 |
| 1 | 1.1A | C_Disc_D4.3mm_W1.9mm_P5.00mm | F1 |
| 4 | BUSPC_HOST | Conn_Edge_ISA8_Longpads | ISA1, ISA2, ISA3, ISA4 |
| 1 | UART Config | PinHeader_2x08_P2.54mm_Vertical | JP1 |
| 1 | Speaker | MagneticBuzzer_ProSignal_ABT-410-RC | SP1 |
| 1 | System Config | SW_DIP_SPSTx10_Slide_9.78x27.58mm_W7.62mm_P2.54mm | SW1 |
| 1 | UMB Config | SW_DIP_SPSTx06_Slide_9.78x17.42mm_W7.62mm_P2.54mm | SW2 |
| 1 | ROM Socket Address | SW_DIP_SPSTx04_Slide_9.78x12.34mm_W7.62mm_P2.54mm | SW3 |
| 1 | U35 ROM Size | SW_MS-22D18G2 | SW4 |
| 1 | Power | SW_PUSH_6mm | SW5 |
| 1 | Reset | SW_PUSH_6mm | SW6 |
| 3 | 1N4148 | D_DO-34_SOD68_P7.62mm_Horizontal | D1, D4, D5 |
| 1 | Bus Activity | LED_D3.0mm | D3 |
| 1 | CF Activity | LED_D3.0mm | D6 |
| 1 | 5VSB | LED_D3.0mm | D7 |
| 1 | +5V | LED_D3.0mm | D8 |
| 1 | +12V | LED_D3.0mm | D9 |
| 1 | -12V | LED_D3.0mm | D10 |
| 1 | -5V | LED_D3.0mm | D11 |
| 6 | BEAD | R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | FB1, FB2, FB3, FB4, FB5, FB6 |
| 1 | 2.7uH | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | L1 |
| 2 | 5.7uH | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | L2, L3 |
| 47 | 100nF | C_Disc_D4.3mm_W1.9mm_P5.00mm | C1, C2, C3, C4, C5, C6, C7, C9 +39 |
| 21 | 10uF | C_Disc_D4.3mm_W1.9mm_P5.00mm | C8, C20, C21, C23, C24, C25, C26, C27 +13 |
| 10 | 47pF | C_Disc_D4.3mm_W1.9mm_P5.00mm | C11, C38, C41, C42, C43, C44, C45, C54 +2 |
| 1 | 5-30pF | C_Disc_D4.3mm_W1.9mm_P5.00mm | C14 |
| 3 | 22pF | C_Disc_D4.3mm_W1.9mm_P5.00mm | C18, C82, C83 |
| 1 | 10nF | C_Disc_D4.3mm_W1.9mm_P5.00mm | C22 |
| 1 | 1uF | C_Disc_D4.3mm_W1.9mm_P5.00mm | C34 |
| 1 | 100pF | C_Disc_D4.3mm_W1.9mm_P5.00mm | C37 |
| 1 | 470pF | C_Disc_D4.3mm_W1.9mm_P5.00mm | C39 |
| 1 | 1nF | C_Disc_D4.3mm_W1.9mm_P5.00mm | C53 |
| 1 | 4.7nF | C_Disc_D4.3mm_W1.9mm_P5.00mm | C84 |
| 2 | 470 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R15 |
| 2 | 1M | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2, R33 |
| 5 | 10K | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3, R11, R14, R16, R31 |
| 2 | 47 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R4, R5 |
| 8 | 1K | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R6, R7, R8, R12, R13, R18, R29, R30 |
| 3 | 33 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R9, R21, R22 |
| 4 | 4.7K | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R10, R20, R26, R27 |
| 1 | 100 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R17 |
| 4 | 150 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R19, R23, R24, R25 |
| 1 | 5.6K | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R28 |
| 1 | 1.5K | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R32 |
| 1 | 4.7K | R_Array_SIP9 | RN1 |
| 5 | 10K | R_Array_SIP9 | RN2, RN3, RN6, RN14, RN15 |
| 3 | 4.7K | R_Array_SIP7 | RN4, RN5, RN12 |
| 1 | 1K | R_Array_SIP7 | RN13 |
NuXT design files
The KiCad project lives in the monotech/NuXT repository on GitHub; these links point at the commit this page was built from.
- LayoutProject NuXT.kicad_pcb
NuXT: common questions
What microcontroller does the NuXT use?
The NuXT is built around the PIC12F629, from the PIC family.
How big is the NuXT PCB?
The NuXT measures 184.9 × 243.8 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the NuXT?
214 components, from 87 distinct parts. The full bill of materials is listed on this page.
Where can I download the NuXT design files?
From the monotech/NuXT repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the NuXT design in my own project?
Yes, under the terms of its GPL-3.0 license, which monotech chose for the repository.
Can I test firmware for the NuXT without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug PIC firmware against it before you order a PCB.
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