Transfer
About the Transfer PCB
Transfer 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 47 components from 18 distinct parts.
Other key parts include the 74HC173, 74HC157, 74HC245 and 74HC08. By type, the board carries 16 resistors, 11 diodes, 8 capacitors, 7 ICs and 5 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 Transfer
Transfer bill of materials (BOM)
47 components, 18 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | 74HC173 | SOIC-16_3.9x9.9mm_P1.27mm | U1, U4 |
| 2 | 74HC157 | SOIC-16_3.9x9.9mm_P1.27mm | U2, U5 |
| 2 | 74HC245 | SO-20_12.8x7.5mm_P1.27mm | U3, U9 |
| 1 | 74HC08 | SOIC-14_3.9x8.7mm_P1.27mm | U6 |
| 1 | Control | PinHeader_1x04_P2.54mm_Vertical | J2 |
| 1 | Sync | PinHeader_1x04_P2.54mm_Vertical | J3 |
| 1 | + Power - | PinHeader_2x02_P2.54mm_Vertical | J4 |
| 1 | Address Bus | PinHeader_1x16_P2.54mm_Vertical | J5 |
| 1 | Main Bus | PinHeader_1x08_P2.54mm_Vertical | J6 |
| 8 | LED | LED_0805_2012Metric | D1, D2, D3, D4, D5, D6, D7, D8 |
| 1 | LOAD | LED_0805_2012Metric | D9 |
| 1 | OUT | LED_0805_2012Metric | D10 |
| 1 | ADDR | LED_0805_2012Metric | D11 |
| 7 | 100nF | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C2, C3, C4, C5, C6, C8 |
| 1 | 10uF | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C7 |
| 11 | 330 | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R2, R3, R4, R5, R6, R7, R8 +3 |
| 4 | 10K | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R12, R13, R14, R15 |
| 1 | 100K | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R16 |
Transfer 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.
Transfer: common questions
How big is the Transfer PCB?
The Transfer measures 62.2 × 21.6 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the Transfer?
47 components, from 18 distinct parts. The full bill of materials is listed on this page.
Where can I download the Transfer 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 Transfer design in my own project?
Yes, under the terms of its MIT license, which Velko chose for the repository.
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