Backplane
About the Backplane PCB
Backplane is an open source PCB design by 89Mods, published on GitHub under the MIT license. It is a 4-layer board measuring 153.9 × 60.5 mm, with 24 components from 14 distinct parts.
Other key parts include the 74HCT04. By type, the board carries 10 resistors, 8 connectors, 3 capacitors, 2 diodes and 1 IC.
From the project
Replica of the Launch Vehicle Digital Computer using 74-series logic
This LVDC is accurate to the original in the sense that it executes the same instructions that function the exact same, has the same memory layout (including special locations like HOP save and MQ) and can execute snippets of original LVDC code.
The differences are: - This computer is parallel and not bit-serial, and is also microcoded - It is implemented using 74-series logic and not discrete transistors (I wish to be able to take it with me to events, so it couldn’t get too big) - Everything hooked up to the PIO (IO read/write) instruction is my own invention, with the exception of the the…
Main components on the Backplane
Backplane bill of materials (BOM)
24 components, 14 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 74HCT04 | DIP-14_W7.62mm | U1 |
| 1 | SLOT1 | PinHeader_2x22_P2.54mm_Vertical | J1 |
| 1 | SLOT2 | PinHeader_2x22_P2.54mm_Vertical | J2 |
| 1 | SLOT3 | PinHeader_2x22_P2.54mm_Vertical | J3 |
| 1 | SLOT4 | PinHeader_2x22_P2.54mm_Vertical | J4 |
| 1 | SLOT5 | PinHeader_2x22_P2.54mm_Vertical | J5 |
| 1 | GPIO | PinHeader_2x22_P2.54mm_Vertical | J6 |
| 2 | SCREW_TERMINAL_01X02 Screw_Terminal_01x02 | TerminalBlock_bornier-2_P5.08mm | J7, J8 |
| 2 | LED | LED_1206_3216Metric_Pad1.42x1.75mm_HandSolder | D1, D2 |
| 1 | 100NF 100nF | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1 |
| 1 | 10µF | CP_Radial_D4.0mm_P2.00mm | C2 |
| 1 | 1µF | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C3 |
| 7 | 2K | R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R1, R2, R3, R4, R5, R6, R7 |
| 3 | R_NETWORK08 R_Network08 | R_Array_SIP9 | RN1, RN2, RN3 |
Backplane design files
The KiCad project lives in the 89Mods/LVDC repository on GitHub; these links point at the commit this page was built from.
Backplane: common questions
How big is the Backplane PCB?
The Backplane measures 153.9 × 60.5 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the Backplane?
24 components, from 14 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Backplane design files?
From the 89Mods/LVDC repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the Backplane design in my own project?
Yes, under the terms of its MIT license, which 89Mods chose for the repository.
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