Spi
About the Spi PCB
Spi is an open source PCB design by zuiko21, published on GitHub under the MIT license. It is a 2-layer board measuring 82.6 × 39.4 mm, with 29 components from 20 distinct parts.
Other key parts include the 74HC138, 74HC174, 74HC165, 74HC595 and 74HC132. By type, the board carries 7 resistors, 6 ICs, 6 connectors, 5 diodes, 4 capacitors and 1 transistor.
It belongs with the retro computing designs in this gallery.
From the project
Scalable OS for 6502/65816
With great embarrassment I have to admit never having owned a 65xx computer... but suport for these classic machines shouldn't be difficult to add -- for instance, I have declared as 'reserved' the two first zero-page bytes in case the utterly popular Commodore-64 (using a 6510) is targeted.
Back to my own-designed devices, here's the range (past, present and future):
Main components on the Spi
Spi bill of materials (BOM)
29 components, 20 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 74HC138 | DIP-16_W7.62mm_Socket | U1 |
| 1 | 74HC174 | DIP-16_W7.62mm_Socket | U2 |
| 1 | 74HC165 | DIP-16_W7.62mm_Socket | U3 |
| 1 | 74HC595 | DIP-16_W7.62mm_Socket | U4 |
| 1 | 74HC132 | DIP-14_W7.62mm_Socket | U5 |
| 1 | 74HC245 | DIP-20_W7.62mm_Socket | U6 |
| 1 | 2N7000 | TO-92-3 | Q1 |
| 1 | IOx | PinSocket_2x08_P2.54mm_Horizontal | J1 |
| 1 | SPI 0 | IDC-Header_2x03_P2.54mm_Vertical | J2 |
| 1 | SPI 1 | IDC-Header_2x03_P2.54mm_Vertical | J3 |
| 1 | SPI 2 | IDC-Header_2x03_P2.54mm_Vertical | J4 |
| 1 | SPI 3 | PinHeader_2x03_P2.54mm_Vertical | J5 |
| 1 | I2C | PinHeader_1x05_P2.54mm_Horizontal | J6 |
| 3 | 4148 | D_DO-35_SOD27_P2.54mm_Vertical_AnodeUp | D1, D2, D3 |
| 2 | BAT85 | D_DO-35_SOD27_P2.54mm_Vertical_KathodeUp | D4, D5 |
| 1 | 22n | C_Disc_D5.0mm_W2.5mm_P5.00mm | C1 |
| 3 | 68p | C_Disc_D3.8mm_W2.6mm_P2.50mm | C2, C3, C4 |
| 1 | 1K2 | R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R1 |
| 5 | 3K3 | R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R2, R3, R5, R6, R7 |
| 1 | 6K8 | R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R4 |
Spi design files
The KiCad project lives in the zuiko21/minimOS repository on GitHub; these links point at the commit this page was built from.
Spi: common questions
How big is the Spi PCB?
The Spi measures 82.6 × 39.4 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Spi?
29 components, from 20 distinct parts. The full bill of materials is listed on this page.
Where can I download the Spi design files?
From the zuiko21/minimOS repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the Spi design in my own project?
Yes, under the terms of its MIT license, which zuiko21 chose for the repository.
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