2 layers168.1 × 94.4 mm
4 layers231.9 × 218.7 mm
286 schematic
TomasPavlovicPavlo/286_schematic- Size
- 231.9 × 218.7 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 163
- Nets
- 483
- Pads
- 2,087
- Tracks, vias
- 12,333, 836
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 8 Jun 2025
- Updated
- 3 Aug 2025
Overview
286 schematic is an open-source printed circuit board by TomasPavlovicPavlo, from the TomasPavlovicPavlo/286_schematic repository on GitHub. It is a 4-layer board of 231.9 × 218.7 mm with 163 parts on 483 nets, routed with 12,333 tracks and 836 vias.
It is built around the PAL16L8-5JC, 74LS245SC and 74AHCT125D, with the 74LS00SC, 74LS32SC and 2SC1815 among its other parts. Its parts include 39 capacitors, 25 resistors, 18 ICs, 11 connectors and 4 diodes.
Main components
7PAL16L8-5JC
PLCC-205V 5ns PAL PAL16L8 PLCC-20 Programmable Logic Device (CPLDs/FPGAs)Infineon TechnologiesProgrammable Logic Device (CPLDs/FPGAs)74LS245SC
-0℃~+70℃ 12ns@5V,45pF 15mA 24mA 4.75V~5.25V 74LS 8 Bidirectional Output enable Schmitt trigger Tri-State - Buffers, Drivers, Receivers, Transceivers ROHSTexas InstrumentsBuffers, Drivers, Receivers, Transceivers
74AHCT125D
SOP-14-40℃~+125℃ 1 4 4.3ns@5V,50pF 4.5V~5.5V 40uA 74AHCT 8mA 8mA Schmitt trigger Tri-State Unidirectional SOP-14 Buffers, Drivers, Receivers, Transceivers ROHSNexperiaBuffer/Driver/Transceiver
74LS00SC
-0℃~+70℃ 15ns@5V,50pF 2 2.7V 2V 4 4.75V~5.25V 400uA 500mV 74LS 800mV 8mA NAND Gate - Logic Gates ROHSTexas InstrumentsLogic Gates
74LS32SC
-- Logic Gates ROHSTexas InstrumentsLogic Gates
2SC1815
SOT-23-55℃~+150℃ 1 NPN 100nA 130 150mA 200mW 250mV 50V 5V 80MHz NPN SOT-23 Bipolar (BJT) ROHShongjiachengBipolar (BJT)2SA1015
SOT-231 PNP 100nA 130 150mA 200mW 300mV 50V 5V 80MHz PNP SOT-23 Bipolar (BJT) ROHSHXY MOSFETBipolar (BJT)
README
README.mdReverse engineering of 286 motherboard
This is the repository vhere I am working on reverse engineering of one 286 motherboard. It is still in progress. I use KiCad. In the PCB editor I insert fotos as background image and draw all tracks. Then I transfer all to schematic and analyse connections.
Parts
163| Qty | Value | Footprint | References |
|---|---|---|---|
| 23 | ~ | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C17, C18, C25, C28, C30, C31, C32, C34, C38, C40, C41, C43, C44, C45, C46, C47 +7 |
| 12 | R_Small | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R1, R10, R11, R17, R18, R45, R46, R47, R49, R59, R61, R62 |
| 10 | 10u | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C19, C27, C37, C39, C54, C55, C58, C61, C66, C68 |
| 8 | M5M44256BP | Package_DIP:CERDIP-20_W7.62mm_SideBrazed | RAM1, RAM2, RAM3, RAM4, RAM7, RAM8, RAM9, RAM10 |
| 7 | Conn_01x02 | Connector_PinSocket_2.54mm:PinSocket_1x02_P2.54mm_Vertical | JP2, JP10, JP14, JP15, RESET1, TUR-LED1, TURBO1 |
| 6 | Conn_01x03 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | JP1, JP6, JP7, JP18, JP19, JP20 |
| 6 | R_Small | _mine:R_Axial_L3.6mm_D1.6mm_P4.5mm_Horizontal | R9, R12, R16, R44, R48, R57 |
| 5 | R_Network08 | Resistor_THT:R_Array_SIP9 | RA1, RA2, RA3, RA7, RP12 |
| 4 | 10R | Resistor_THT:R_Array_SIP8 | RP2, RP3, RP4, RP5 |
| 4 | 30R | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R14, R53, R55, R56 |
| 4 | 74LS245 | Package_DIP:DIP-20_W7.62mm | U1, U3, U11, U18 |
| 4 | Bus_ISA_16bit | _mine:ISA_16bit | J9, J10, J11, J12 |
| 4 | D_Small | Diode_THT:D_A-405_P10.16mm_Horizontal | D1, D2, D3, D4 |
| 4 | MN41256A | Package_DIP:CERDIP-16_W7.62mm_SideBrazed | RAM5, RAM6, RAM11, RAM12 |
| 4 | R_Network04 | Resistor_THT:R_Array_SIP5 | RA5, RA6, RP10, RP11 |
| 4 | SIMM_30_pin | Connector_PinHeader_2.54mm:PinHeader_1x30_P2.54mm_Vertical | BANK2_1, BANK2_2, BANK3_1, BANK3_2 |
| 3 | 2SC1815 | Package_TO_SOT_THT:TO-92L_Inline_Wide | Q1, Q2, Q4 |
| 3 | Conn_01x04 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J17(HDDLED)1, JP9, SPEAKER1 |
| 3 | DNP | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C59, C63, C67 |
| 2 | Bus_ISA_8bit_narrow | _mine:ISA_8bit | J7, J8 |
| 2 | DNP | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C50, C82 |
| 2 | DNP | Connector_PinSocket_2.54mm:PinSocket_1x02_P2.54mm_Vertical | JP5, JP11 |
| 1 | 10n | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C7 |
| 1 | 14.31818MHz | Crystal:Crystal_HC50_Horizontal | X1 |
| 1 | 1k | _mine:R_Axial_L3.6mm_D1.6mm_P4.5mm_Horizontal | R60 |
| 1 | 24MHz | Oscillator:Oscillator_DIP-14 | OSC2 |
| 1 | 27C512 | Package_DIP:DIP-28_W15.24mm | U9 |
| 1 | 29R | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R2 |
| 1 | 2SA1015 | Package_TO_SOT_THT:TO-92L_Inline_Wide | Q3 |
| 1 | 31A-5500 | _mine:31A-5500 | DL1 |
| 1 | 32.768kHz | Crystal:Crystal_AT310_D3.0mm_L10.0mm_Horizontal | X2 |
| 1 | 32MHz | Oscillator:Oscillator_DIP-14 | OSC1 |
| 1 | 330R | _mine:R_Axial_L3.6mm_D1.6mm_P4.5mm_Horizontal | R52 |
| 1 | 33R | Resistor_THT:R_Array_SIP8 | RP8 |
| 1 | 4069 | Package_DIP:DIP-14_W7.62mm | U16 |
| 1 | 47R | Resistor_THT:R_Array_SIP8 | RP6 |
| 1 | 74AHCT125 | Package_DIP:DIP-14_W7.62mm | U17 |
| 1 | 74LS00 | Package_DIP:DIP-14_W7.62mm | U12 |
| 1 | 74LS06 | Package_DIP:DIP-14_W7.62mm | U14 |
| 1 | 74LS32 | Package_DIP:DIP-14_W7.62mm | U4 |
| 1 | 80C287 | _mine:DIP-40_W15.24mm_Socket_small_pad | U5 |
| 1 | B | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | BKSW1 |
| 1 | Battery_Cell | _mine:286_bat | BT1 |
| 1 | Conn_01x05 | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical | KEYLOCK1 |
| 1 | Conn_01x12_Pin | Connector_Molex:Molex_KK-396_A-41791-0012_1x12_P3.96mm_Vertical | POWER1 |
| 1 | Conn_02x08_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x08_P2.54mm_Vertical | SW1 |
| 1 | Conn_02x17_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x17_P2.54mm_Vertical | CON2 |
| 1 | Conn_02x20_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x20_P2.54mm_Vertical | CON1 |
| 1 | D8041AHC | _mine:DIP-40_W15.24mm_Socket_small_pad | U19 |
| 1 | DIN-5 | _mine:286_DIN5 | KEYBOARD1 |
| 1 | DNP | Oscillator:Oscillator_DIP-14 | OSC3 |
| 1 | HM6818P | Package_DIP:DIP-24_W15.24mm_Socket | U15 |
| 1 | J | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | BKSW3 |
| 1 | K | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | BKSW2 |
| 1 | MCS3201FN | Package_LCC:PLCC-68 | U8 |
| 1 | N80L286-16/S | _mine:PLCC-68_from_1 | U7 |
| 1 | P | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | BKSW4 |
| 1 | PAL16L8 | Package_DIP:DIP-20_W7.62mm | U20 |
| 1 | R_Network09 | Resistor_THT:R_Array_SIP10 | RP1 |
| 1 | ST62C241-A | Package_QFP:PQFP-160_28x28mm_P0.65mm | U6 |
| 1 | ST62C303-A | Package_QFP:PQFP-160_28x28mm_P0.65mm | U10 |
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Questions
How big is the 286 schematic PCB?
It measures 231.9 × 218.7 mm and has 4 copper layers, 1.6 mm thick.
What parts does the 286 schematic use?
163 parts, built around the PAL16L8-5JC, 74LS245SC, 74AHCT125D and 74LS00SC. 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 286 schematic KiCad files?
From the TomasPavlovicPavlo/286_schematic repository on GitHub, at the commit this page was made from: the board is KiCAD/286.kicad_pcb and its schematic IDE_controller/IDE_controller/IDE_controller.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the 286 schematic design in my own project?
Its repository states no licence, so its author keeps all rights: ask TomasPavlovicPavlo before reusing the design.