2 layers150.5 × 75.1 mm
2 layers188 × 68.6 mm
BackPlane
murray1978/A65026502 project running wozmon and wozaci
- Size
- 188 × 68.6 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 22
- Nets
- 69
- Pads
- 367
- Tracks, vias
- 967, 43
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 11 May 2021
- Updated
- 12 Oct 2025
Overview
BackPlane is an open-source printed circuit board by murray1978, from the murray1978/A6502 repository on GitHub. It is a 2-layer board of 188 × 68.6 mm with 22 parts on 69 nets, routed with 967 tracks and 43 vias.
It is built around the 74LS245SC, 74LS573PC and 74LS04PC. Its parts include 7 connectors, 6 capacitors and 6 ICs.
Main components
374LS245SC
-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
74LS573PC
DIP-200℃~+70℃ 10ns 3ns 4.75V~5.25V 74LS 8 D Latch Tri-State DIP-20 Latches ROHSTexas InstrumentsLatches
74LS04PC
PDIP-140℃~+70℃ 4.75V~5.25V 6 6.6mA 74LS PDIP-14 InvertersonsemiInverters
README
Hardware/ACI/README.mdCurrent aci issues.
- eprom footprint wrong.
- bypass caps wrong value, use 100n
- 3.5mm sockets to far from edge.
- text on silkscreen a bit hard to read for some values.
- yet to find any more mistakes.
Parts
22| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 100n | Capacitor_THT:C_Rect_L7.0mm_W2.5mm_P5.00mm | C1, C2, C3, C4, C5, C6 |
| 3 | 74LS573 | Package_DIP:DIP-20_W7.62mm_LongPads | U2, U3, U4 |
| 3 | R_Network08 | Resistor_THT:R_Array_SIP9 | RN1, RN2, RN3 |
| 1 | 2764 | Socket:DIP_Socket-28_W11.9_W12.7_W15.24_W17.78_W18.5_3M_228-1277-00-0602J | U5 |
| 1 | 74LS04 | Package_DIP:DIP-14_W10.16mm_LongPads | U6 |
| 1 | 74LS245 | Package_DIP:DIP-20_W7.62mm_LongPads | U1 |
| 1 | DB Enable select | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J8 |
| 1 | EX1 | Connector_IDC:IDC-Header_2x20_P2.54mm_Vertical | J5 |
| 1 | EX2 | Connector_IDC:IDC-Header_2x20_P2.54mm_Vertical | J6 |
| 1 | FDC | Connector_IDC:IDC-Header_2x20_P2.54mm_Vertical | J4 |
| 1 | TO A6502 | Connector_IDC:IDC-Header_2x20_P2.54mm_Horizontal | J1 |
| 1 | User Rom Enable | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J7 |
| 1 | Video | Connector_IDC:IDC-Header_2x20_P2.54mm_Vertical | J2 |
Questions
How big is the BackPlane PCB?
It measures 188 × 68.6 mm and has 2 copper layers, 1.6 mm thick.
What parts does the BackPlane use?
22 parts, built around the 74LS245SC, 74LS573PC and 74LS04PC. 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 BackPlane KiCad files?
From the murray1978/A6502 repository on GitHub, at the commit this page was made from: the board is Hardware/BackPlane/BackPlane.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the BackPlane design in my own project?
Its repository states no licence, so its author keeps all rights: ask murray1978 before reusing the design.
More from murray1978/A6502
7- 2 layers150.5 × 75.1 mm
- 2 layers110.5 × 60.1 mm
- 2 layers
- 2 layers40 × 37.7 mm
- 2 layers
- 2 layers
Similar boards
- 2 layers182.9 × 172.7 mm
- 2 layers114.3 × 106.7 mm
- 2 layers157.5 × 73.9 mm
- 4 layers254 × 254 mm
- 2 layers100 × 100 mm
RTC
crankery/crank68
One day I thought to myself I want to build a computer with the simplest 8 bit CPU I can think of". That CPU is the Motorola M6800 and this is the computer.
28 partsMIT - 2 layers218 × 125 mm
EVA1 production
roberto314/EVA-1_Reproduction
Recreation of the very rare K-K Systems EVA-1 Display Adapter for the Epson HX-20 Computer
116 parts - 4 layers127 × 127 mm
- 4 layers150 × 150 mm
Homebrew 486
mattheeewahn/MDA80486SBC_Final
크기가 너무 커서 압축파일로 올립니다. PCB로 가면 아웃풋이 있고 아웃풋에 가면 homebrew486Bcu압축파일이 있는데 그대로 캐드나 온라인 거버 뷰어에 올리시면 볼수 있습니다
130 parts1GPL-3.0