4 layers45 × 15.8 mm
FazElk 24V10WSelenoidValveDriver
RaMuTULAY/PCBSch_Example_MCU_SupplyCircuit
Part of a PCB, supply circuit 24V to 3V3 smps buck converter MAX20076DATCA
17 parts
4 layers154.9 × 142.2 mm
816-v2
cookie99999/65021Code/schematics/etc for my 6502 computer project
- Size
- 154.9 × 142.2 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 60
- Nets
- 188
- Pads
- 572
- Tracks, vias
- 946, 28
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 4 Mar 2024
- Updated
- 28 Apr 2026
Overview
816-v2 is an open-source printed circuit board by cookie99999, from the cookie99999/6502 repository on GitHub. It is a 4-layer board of 154.9 × 142.2 mm with 60 parts on 188 nets, routed with 946 tracks and 28 vias.
It is built around the ATTINY26L-8SU, 74HC245D and 74HC573, with the 74HC74D and SD103AW among its other parts. Its parts include 14 capacitors, 12 ICs, 10 resistors, 10 connectors and 5 diodes. It belongs with the RP2040, AVR (ATmega, ATtiny) and FPGA and CPLD boards of this library.
Main components
5
ATTINY26L-8SU
SOIC-20-300mil10bit 16 1KB 2.7V~5.5V 8MHz AVR FLASH SOIC-20-300mil Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)74HC245D
SO-20-300mil-40℃~+125℃ 1 160uA 2V~6V 7.8mA 7.8mA 74HC 8 9ns@4.5V,50pF Bidirectional Tri-State SOIC-20-300mil Buffers, Drivers, Receivers, Transceivers ROHSNexperiaBuffers, Drivers, Receivers, Transceivers
74HC573
SOP-20-40℃~+85℃ 14ns 1ns 2V~6V 4ns 74HC 8 8uA D Latch Tri-State SOP-20 Latches ROHSHXY MOSFETLatches
74HC74D
SOIC-14-40℃~+125℃ 1 15ns 2 2V~6V 3.5pF 37ns@6V,50pF 3ns、3ns、3ns 40uA 5.2mA 5.2mA 74HC Series 82MHz Asynchronous Complementary D-Type Rising Edge Set and Reset SOIC-14 Flip Flops ROHSNexperiaFlip Flops
SD103AW
SOD-123Schottky Diodeshongjiacheng
README
README.mdThese are the relevant files for my ongoing WDC 65C816 based homebrew computer. It started off pretty similar to Ben Eater's 65C02 computer, but I've made significant changes since then and will continue to do so.
Current Specs:
- WDC 65C816 clocked at 4MHz (reasonably stable at 6MHz, fails to boot at 8 likely due to slow memory/logic)
- 512K SRAM
- 8K NOR flash accessible to the user
- 2 6522 VIAs providing 2 8-bit GPIO ports and a couple timers and shift registers each
- 6551 ACIA UART for serial I/O. Rockwell part works only up to about 4MHz, but avoids the TX empty flag bug of the WDC part
- PS/2 interface provided by ATTiny26L on one of the VIA ports
- CompactFlash storage (via PATA adapter)
- VGA video output from a Pi Pico 2 providing text display and (very slow) bitmapped graphics
- expensive and oversized 4-layer PCB
To do list:
- Bitbang an SPI RTC on a remaining VIA port
- possibly look into sound and/or joysticks on the other 2
- new PCB layout using more SMD/PLCC parts to reduce size and cost, with more SRAM and a proper DE-9 serial port
I've used and modified ideas from many sources, notably Ben Eater, Garth Wilson, Daryl Rictor, Grant Searle, and many users and articles on the 6502.org forum.
Parts
60| Qty | Value | Footprint | References |
|---|---|---|---|
| 11 | 0.1uF | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C1, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4 |
| 3 | 10K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R6, R7, R10 |
| 3 | 330 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R3, R4 |
| 2 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R8, R9 |
| 2 | 1N4001 | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D1, D5 |
| 2 | SD103A | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D3, D4 |
| 2 | W65C22S | Package_DIP:DIP-40_W15.24mm_Socket | U9, U10 |
| 1 | 0.1uf | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C4 |
| 1 | 1.8342MHz | Oscillator:Oscillator_DIP-8 | Y2 |
| 1 | 100uf | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C3 |
| 1 | 10uf | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C2 |
| 1 | 220 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2 |
| 1 | 470 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R5 |
| 1 | 74HC245 | Package_DIP:DIP-20_W7.62mm_Socket | U4 |
| 1 | 74HC573 | Package_DIP:DIP-20_W7.62mm_Socket | U3 |
| 1 | 74HC74 | Package_DIP:DIP-14_W7.62mm_Socket | U2 |
| 1 | 7805 | Package_TO_SOT_THT:TO-220-3_Vertical | VR1 |
| 1 | 8MHz | Package_DIP:DIP-8_W7.62mm_Socket | Y1 |
| 1 | AS6C4008 | Package_DIP:DIP-32_W15.24mm_Socket | U13 |
| 1 | ATF1504AS | Package_LCC:PLCC-44_THT-Socket | U5 |
| 1 | ATtiny26L | Package_DIP:DIP-20_W7.62mm_Socket | U6 |
| 1 | Barrel_Jack | Connector_BarrelJack:BarrelJack_Horizontal | J1 |
| 1 | DE-15 HD | custom:AMPHENOL_ICD15S13E4GV00LF | J9 |
| 1 | DS1813-5 | Package_TO_SOT_THT:TO-92L | U12 |
| 1 | LED | LED_THT:LED_D5.0mm | D2 |
| 1 | Mini-DIN-6 | custom:TE_5749180-1 | J10 |
| 1 | PATA | Connector_IDC:IDC-Header_2x20_P2.54mm_Vertical | J5 |
| 1 | PATA_PWR | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J6 |
| 1 | Pico left | Connector_PinHeader_2.54mm:PinHeader_1x20_P2.54mm_Vertical | J7 |
| 1 | Pico right | Connector_PinHeader_2.54mm:PinHeader_1x20_P2.54mm_Vertical | J8 |
| 1 | SST39SF020 | Package_DIP:DIP-32_W15.24mm_Socket | U8 |
| 1 | SW_Push | Button_Switch_THT:SW_PUSH_6mm | SW2 |
| 1 | SW_SPST | Button_Switch_THT:SW_Slide_SPDT_Straight_CK_OS102011MS2Q | SW1 |
| 1 | UART | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J2 |
| 1 | VIA1 Port B | Connector_PinHeader_2.54mm:PinHeader_2x06_P2.54mm_Vertical | J3 |
| 1 | VIA2 Connector | Connector_PinHeader_2.54mm:PinHeader_2x12_P2.54mm_Vertical | J4 |
| 1 | W65C51 | Package_DIP:DIP-28_W15.24mm_Socket | U11 |
| 1 | W65C816 | Package_DIP:DIP-40_W15.24mm_Socket | U1 |
Questions
How big is the 816-v2 PCB?
It measures 154.9 × 142.2 mm and has 4 copper layers, 1.6 mm thick.
What parts does the 816-v2 use?
60 parts, built around the ATTINY26L-8SU, 74HC245D, 74HC573 and 74HC74D. 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 816-v2 KiCad files?
From the cookie99999/6502 repository on GitHub, at the commit this page was made from: the board is kicad/816-v2/816-v2.kicad_pcb and its schematic kicad/816-v2/816-v2.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the 816-v2 design in my own project?
Its repository states no licence, so its author keeps all rights: ask cookie99999 before reusing the design.
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