2 layers182 × 138.8 mm
-816-board
snippyrow/-816-board
A retro computer motherboard for the W65C816S CPU. Dual-core expandable, 16mb extended memory, four expansion ports.
141 partsMIT
2 layers225.1 × 167.8 mm
6502 computer
jp0409hlh/6502_computer7A computer based on Ben Eater's 6502 series
- Size
- 225.1 × 167.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 81
- Nets
- 193
- Pads
- 680
- Tracks, vias
- 1,799, 106
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 20 May 2026
- Updated
- 16 Aug 2026
Overview
6502 computer is an open-source printed circuit board by jp0409hlh, from the jp0409hlh/6502_computer repository on GitHub. It is a 2-layer board of 225.1 × 167.8 mm with 81 parts on 193 nets, routed with 1,799 tracks and 106 vias.
It is built around the MAX232N, 74LS574N and 74HC138, with the 74HC595, 74HC00D and 74HC14 among its other parts. Its parts include 28 capacitors, 18 ICs, 9 resistors, 8 connectors and 5 diodes. It belongs with the retro computing and games boards of this library.
Main components
10
MAX232N
PDIP-160℃~+70℃ 120Kbps 2 2 4.5V~5.5V Transceiver PDIP-16 RS232 ICs ROHSTexas InstrumentsRS232 ICs74LS574N
-0ns 0℃~+70℃ 1 2.6mA 20ns 24mA 28ns@5V,45pF 35MHz 4.75V~5.25V 74LS Series 8 D-Type Rising Edge Tri-State - Flip Flops ROHSRochester Electronics, LLCFlip Flops
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, Decoders74HC595
SOP-16-40℃~+85℃ 1 100ns@5V,50pF 10MHz 2V~6V 74HC 8 Serial-to-Serial or Parallel Tri-State SOP-16 Shift Registers ROHSGRShift Registers
74HC00D
SOP-14-40℃~+125℃ 1.5V、3.15V、4.2V 1.9V、3.7V、5.9V 100mV、400mV、400mV 2 2V~6V 4 40uA 5.2mA 5.2mA 500mV~1.8V 74HC Series 7ns@6V,50pF NAND Gate SOIC-14 Logic Gates ROHSNexperiaLogic Gates74HC14
SOP-14-40℃~+85℃ 1.9V、3.98V、4.4V、5.48V、5.9V 100mV、260mV、260mV 20uA 25ns@4.5V,50pF 2V~6V 6 74HC Noise suppression function Schmitt trigger SOP-14 Inverters ROHSJSMSEMIInverters74HCT04D
SO-14-40℃~+125℃ 1 19ns@4.5V,50pF 2V 2uA 3.7V 4.5V~5.5V 400mV 4mA 4mA 6 74HCT 800mV SO-14 Inverters ROHSNexperiaInverters
HM62256BLP-7
DIP28DIP28 New Arrivals ROHSHITUncategorised
2SC1815
SOT-23-55℃~+150℃ 1 NPN 100nA 130 150mA 200mW 250mV 50V 5V 80MHz NPN SOT-23 Bipolar (BJT) ROHShongjiachengBipolar (BJT)RCJ-045
插件插件 RCA Connector ROHSCUIAudio Connectors (Headphones)
README
README.mdJP6502 computer
Warning: This repo is still early in development
Hardware
Warning : This section is still under development, do not expect anything to work. This folder contains the schematics and pcb files for this project.
main_computer
This folder constains the schematics and pcb files for the JP6502 motherboard.
others
Future plans : Floppy disk controller expansion card, SD card interface expansion card, ESP32 network expansion card.
Software
Warning : This section is still under development, do not expect anything to work. This folder contains softwares I wrote for this computer, mainly the OS.
Credits
- Ben eater - for the 6502 Youtube series
- krallja - for the tutorial of interfacing the Tms9918
- Doctor Volt - for the tutorial of how to connect the Tms9918 to an Arduino, which helped me test my chip
- tomcircuit - for the design of tms9918 SRAM replacement
- mike's software blog - for the inspiration of the code for xmodem
- sillycowvalley - for the inspiration the kernel
- r/beneater community
Parts
81| Qty | Value | Footprint | References |
|---|---|---|---|
| 20 | 0.1uf | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C1, C2, C3, C4, C10, C11, C12, C13, C15, C16, C17, C21, C24, C26, C27, C28 +4 |
| 6 | MountingHole_Pad | MountingHole:MountingHole_3.2mm_M3_ISO7380_Pad | H1, H2, H3, H4, H5, H6 |
| 4 | 1uf | Capacitor_THT:C_Disc_D5.1mm_W3.2mm_P5.00mm | C18, C19, C20, C23 |
| 3 | 1N5819 | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D1, D2, D5 |
| 3 | 22pf | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C5, C14, C22 |
| 3 | 3.3K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R2, R3 |
| 3 | 74LS574 | Package_DIP:DIP-20_W7.62mm_Socket_LongPads | U2, U3, U5 |
| 2 | 1K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R5, R6 |
| 2 | 74HC138 | Package_DIP:DIP-16_W7.62mm_Socket_LongPads | U10, U12 |
| 2 | 74HC595 | Package_DIP:DIP-16_W7.62mm_Socket_LongPads | U11, U17 |
| 2 | Conn_01x40_Socket | Connector_PinSocket_2.54mm:PinSocket_1x40_P2.54mm_Vertical | J2, J3 |
| 1 | 1.8432MHz | Crystal:Crystal_HC18-U_Vertical | Y3 |
| 1 | 10.738635Mhz | Crystal:Crystal_HC18-U_Vertical | Y2 |
| 1 | 1M | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R9 |
| 1 | 1N4148 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D4 |
| 1 | 22/20pf | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C25 |
| 1 | 220 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R7 |
| 1 | 28C256 | Socket:DIP_Socket-28_W11.9_W12.7_W15.24_W17.78_W18.5_3M_228-1277-00-0602J | U9 |
| 1 | 2SC1815 | Package_TO_SOT_THT:TO-92_HandSolder | Q1 |
| 1 | 33K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R8 |
| 1 | 470 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R4 |
| 1 | 6502 | Package_DIP:DIP-40_W15.24mm_Socket_LongPads | U1 |
| 1 | 6522 | Package_DIP:DIP-40_W15.24mm_Socket_LongPads | U13 |
| 1 | 6551 | Package_DIP:DIP-28_W15.24mm_Socket_LongPads | U16 |
| 1 | 74HC00 | Package_DIP:DIP-14_W7.62mm_Socket_LongPads | U8 |
| 1 | 74HC14 | Package_DIP:DIP-14_W7.62mm_Socket_LongPads | U18 |
| 1 | 74HCT04 | Package_DIP:DIP-14_W7.62mm_Socket_LongPads | U14 |
| 1 | Barrel_Jack_MountingPin | Connector_BarrelJack:BarrelJack_Horizontal | J4 |
| 1 | CXO_DIP8 | Oscillator:Oscillator_DIP-8 | Y1 |
| 1 | Conn_01x12_Pin | Connector_PinHeader_2.54mm:PinHeader_1x12_P2.54mm_Horizontal | J8 |
| 1 | Conn_02x20_Odd_Even | Connector_IDC:IDC-Header_2x20_P2.54mm_Vertical | J1 |
| 1 | DE9_Pins | Connector_Dsub:DSUB-9_Socket_Horizontal_P2.77x2.84mm_EdgePinOffset7.70mm_Housed_MountingHolesOffset9.12mm | J6 |
| 1 | HM62256BLP | Package_DIP:DIP-28_W15.24mm_Socket_LongPads | U4 |
| 1 | HM62256BLP | Package_DIP:DIP-28_W15.24mm_LongPads | U7 |
| 1 | KiCad-Logo2_8mm_SilkScreen | Symbol:KiCad-Logo2_8mm_SilkScreen | kicad_logo |
| 1 | LED | LED_THT:LED_D3.0mm | D3 |
| 1 | MAX232 | Package_DIP:DIP-16_W7.62mm_Socket_LongPads | U15 |
| 1 | Mini-DIN-6 | 5749180-1:TE_5749180-1 | J7 |
| 1 | RCJ-045 | RCJ-045:CUI_RCJ-045 | J5 |
| 1 | SW_Push | Button_Switch_THT:SW_PUSH_6mm_H8mm | SW1 |
| 1 | tms9918 | Package_DIP:DIP-40_W15.24mm_Socket_LongPads | U6 |
The 80 most common of 81 parts.
Questions
How big is the 6502 computer PCB?
It measures 225.1 × 167.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the 6502 computer use?
81 parts, built around the MAX232N, 74LS574N, 74HC138 and 74HC595. 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 6502 computer KiCad files?
From the jp0409hlh/6502_computer repository on GitHub, at the commit this page was made from: the board is hardware/main_board/6502_computer.kicad_pcb and its schematic hardware/main_board/6502_computer.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the 6502 computer design in my own project?
Its repository states no licence, so its author keeps all rights: ask jp0409hlh before reusing the design.
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