Register
About the Register PCB
Register is an open source PCB design by Velko, published on GitHub under the MIT license. It is a 2-layer board measuring 62.2 × 21.6 mm, with 50 components from 15 distinct parts.
Other key parts include the 74HC245 and 74HC173. By type, the board carries 17 resistors, 12 diodes, 8 capacitors, 7 ICs and 6 connectors.
It belongs with the 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 Register
Register bill of materials (BOM)
50 components, 15 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 3 | 74HC245 | SO-20_12.8x7.5mm_P1.27mm | U1, U6, U7 |
| 4 | 74HC173 | SOIC-16_3.9x9.9mm_P1.27mm | U2, U3, U4, U5 |
| 3 | Conn_01x08_Male | PinHeader_1x08_P2.54mm_Vertical | J1, J5, J6 |
| 2 | Conn_01x04_Male | PinHeader_1x04_P2.54mm_Vertical | J2, J3 |
| 1 | Conn_01x04_Male | PinHeader_2x02_P2.54mm_Vertical | J4 |
| 8 | LED | LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D1, D2, D3, D4, D5, D6, D7, D8 |
| 1 | LOAD | LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D9 |
| 1 | BUS | LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D10 |
| 1 | A | LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D11 |
| 1 | B | LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D12 |
| 7 | 100nF | C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C1, C3, C4, C5, C6, C7, C8 |
| 1 | 10µF | C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C2 |
| 4 | 10K | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R1, R2, R3, R4 |
| 12 | 330 | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R5, R6, R7, R8, R9, R10, R11, R12 +4 |
| 1 | 100K | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R13 |
Register 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.
Register: common questions
How big is the Register PCB?
The Register measures 62.2 × 21.6 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Register?
50 components, from 15 distinct parts. The full bill of materials is listed on this page.
Where can I download the Register 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 Register design in my own project?
Yes, under the terms of its MIT license, which Velko chose for the repository.
More boards in 8-bit-CPU
Counter
62.2 × 21.6 mm65 parts4LMIT16
Control
104.7 × 122.1 mm64 parts2LMIT16
Aunit
62.2 × 21.6 mm51 parts4LMIT16
Lunit
62.2 × 21.6 mm47 parts4LMIT16
Transfer
62.2 × 21.6 mm47 parts4LMIT16
Flags
62.2 × 21.6 mm42 parts4LMIT16
Sunit
62.2 × 21.6 mm41 parts4LMIT16
Display back
62.2 × 21.6 mm34 parts4LMIT16
Display front
62.2 × 21.6 mm31 parts2LMIT16
Alu back
132.1 × 114.3 mm26 parts2LMIT16
AVR/ArduinoEeprom burner
68.6 × 53.3 mm22 parts2LMIT16
Similar boards
OpenTendo
Redherring32
196.3 × 118.7 mm93 parts2LTAPR-OHL-1.0850
MCL86jr
MicroCoreLabs
56.1 × 57.1 mm66 parts4LNo license532
24pin flex interposer
Wren6991
29 × 32 mm3 parts2LNo license508
Sram dev board
50 × 50 mm12 parts2LNo license508
TRS-80 Color Computer 3
baldengineer
280 × 155.3 mm204 parts2LCC-BY-4.0442
Commodore Plus 4
284.7 × 158.9 mm212 parts2LCC-BY-4.0442