Display back
About the Display back PCB
Display back is an open source PCB design by Velko, published on GitHub under the MIT license. It is a 4-layer board measuring 62.2 × 21.6 mm, with 34 components from 20 distinct parts.
Other key parts include the AT28C64, 74HC161, 74HC138, 74HC173 and 555. By type, the board carries 10 connectors, 10 capacitors, 7 ICs and 7 resistors.
It belongs with the displays & leds and retro computing designs in this gallery.
From the project
Homebrew 8-bit CPU
After watching [series of videos][eater-net-8bit] by Ben Eater building an 8-bit computer from scratch, I was hooked. Various thoughts for improvements and experiments was running through my mind. But first I have to build one. Improvements will come later. Whom am I kidding? I'll never be able to build an exact replica, I'll incorporate improvements as I go.
Main components on the Display back
Display back bill of materials (BOM)
34 components, 20 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | AT28C64 | PLCC-32_SMD-Socket | U1 |
| 3 | 74HC161 | SOIC-16_3.9x9.9mm_P1.27mm | U2, U3, U4 |
| 1 | 74HC138 | SOIC-16_3.9x9.9mm_P1.27mm | U5 |
| 1 | 74HC173 | SOIC-16_3.9x9.9mm_P1.27mm | U6 |
| 1 | 555 | SOIC-8_3.9x4.9mm_P1.27mm | U7 |
| 1 | Conn_01x08_Male | PinHeader_1x08_P2.54mm_Vertical | J1 |
| 2 | Conn_01x04_Male | PinHeader_1x04_P2.54mm_Vertical | J2, J3 |
| 1 | Conn_01x04_Male | PinHeader_2x02_P2.54mm_Vertical | J4 |
| 1 | DISP_ANODES | PinSocket_1x08_P2.54mm_Vertical | J5 |
| 1 | DISP_CATHODES | PinSocket_1x04_P2.54mm_Vertical | J6 |
| 1 | AUX_VCC | PinHeader_1x02_P2.54mm_Vertical | J7 |
| 1 | AUX_GND | PinHeader_1x02_P2.54mm_Vertical | J8 |
| 1 | VCC_OUT | PinSocket_1x02_P2.54mm_Vertical | J9 |
| 1 | GND_OUT | PinSocket_1x02_P2.54mm_Vertical | J10 |
| 2 | 10nF | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C2 |
| 7 | 100nF | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C3, C4, C5, C6, C7, C8, C9 |
| 1 | 10uF | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C10 |
| 1 | 1K | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1 |
| 4 | 10K | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R2, R3, R4, R6 |
| 2 | 100K | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R5, R7 |
Display back design files
The KiCad project lives in the Velko/8-bit-CPU repository on GitHub; these links point at the commit this page was built from.
Display back: common questions
How big is the Display back PCB?
The Display back measures 62.2 × 21.6 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the Display back?
34 components, from 20 distinct parts. The full bill of materials is listed on this page.
Where can I download the Display back design files?
From the Velko/8-bit-CPU repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the Display back design in my own project?
Yes, under the terms of its MIT license, which Velko chose for the repository.
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