2 layers245.1 × 160 mm
8-Bit CPU 32k
slu4coder/Minimal-64x4-Home-Computer
My DIY TTL home computer with VGA and PS/2 and 4x the processing power of a Commodore C64 or Apple II.
139 parts326
2 layers160.7 × 101.6 mm
- Size
- 160.7 × 101.6 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 29
- Nets
- 48
- Pads
- 179
- Tracks, vias
- 161, 6
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 26 Feb 2026
- Updated
- 4 Nov 2026
Overview
Bycr is an open-source printed circuit board by ntvs-project, from the ntvs-project/project-boom repository on GitHub. It is a 2-layer board of 160.7 × 101.6 mm with 29 parts on 48 nets, routed with 161 tracks and 6 vias.
It is built around the 74HC595 and 74HC165D. Its parts include 13 resistors, 6 connectors, 5 diodes, 3 ICs and 1 switch.
Main components
2README
README.mdProject BOOM!
孩子，你炸了！
- Zina
#ffccdd - Kuku
#ffdd44 - Yiyi
#00cccc
Parts
29| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | 220 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2, R4, R5, R8, R10, R11 |
| 4 | 100 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3, R6, R9, R12 |
| 4 | Conn_01x03 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Horizontal | J1, J2, J3, J4 |
| 4 | LED_RKGB | Custom:LED_D5.0mm-4_RGB_Wide_Pins_Custom | D1, D2, D3, D4 |
| 2 | 74HC595 | Package_DIP:DIP-16_W7.62mm | U1, U2 |
| 2 | Conn_01x02 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Horizontal | J5, J6 |
| 1 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R13 |
| 1 | 220 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R7 |
| 1 | 74HC165 | Package_DIP:DIP-16_W7.62mm | U3 |
| 1 | LED | LED_THT:LED_D5.0mm | D5 |
| 1 | SW_Push | Button_Switch_THT:SW_PUSH-12mm | SW1 |
The 28 most common of 29 parts.
Questions
How big is the Bycr PCB?
It measures 160.7 × 101.6 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Bycr use?
29 parts, built around the 74HC595 and 74HC165D. 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 Bycr KiCad files?
From the ntvs-project/project-boom repository on GitHub, at the commit this page was made from: the board is KiCad/bycr/bycr.kicad_pcb and its schematic KiCad/bycr/bycr.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Bycr design in my own project?
Its repository states no licence, so its author keeps all rights: ask ntvs-project before reusing the design.
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