Transistor 8-bit Bus
About the Transistor 8-bit Bus PCB
Transistor 8-bit Bus is an open source PCB design by DragonMinded, published on GitHub. It is a 2-layer board measuring 129.5 × 45.7 mm, with 63 components from 7 distinct parts.
By type, the board carries 24 resistors, 21 connectors, 8 transistors, 8 diodes and 2 capacitors.
From the project
Hardware and software files for the MiniDragon CPU.
Schematics, hardware simulator and software files for the MiniDragon CPU. This is a from-scratch CPU that I designed and am implementing using transistors, capacitors, resistors and diodes. The goal is to make an 8-bit CPU that could be used for general-purpose computing. There are a lot of toy instruction sets floating around on the web. I chose instead to design my own, loosely based off of the PDP and 6502. It is a single accumulator design with a pair of 16-bit stack pointers and a pair of temporary 8-bit registers. Instructions are 8 bits, operands are 8 bits from memory, temporary…
Transistor 8-bit Bus bill of materials (BOM)
63 components, 7 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 8 | 2N2222 | TO-92_Inline | Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8 |
| 3 | Power | PinHeader_1x02_P2.54mm_Vertical | J1, J2, J5 |
| 18 | Bus | PinHeader_1x08_P2.54mm_Vertical | J3, J4, J6, J7, J8, J9, J10, J11 +10 |
| 8 | LED | LED_D5.0mm | D1, D2, D3, D4, D5, D6, D7, D8 |
| 2 | 0.1uF | C_Disc_D4.3mm_W1.9mm_P5.00mm | C1, C2 |
| 8 | 100 | R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R1, R2, R3, R4, R5, R6, R7, R8 |
| 16 | 10K | R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R9, R10, R11, R12, R13, R14, R15, R16 +8 |
Transistor 8-bit Bus design files
The KiCad project lives in the DragonMinded/minidragon repository on GitHub; these links point at the commit this page was built from.
Transistor 8-bit Bus: common questions
How big is the Transistor 8-bit Bus PCB?
The Transistor 8-bit Bus measures 129.5 × 45.7 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Transistor 8-bit Bus?
63 components, from 7 distinct parts. The full bill of materials is listed on this page.
Where can I download the Transistor 8-bit Bus design files?
From the DragonMinded/minidragon repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Transistor 8-bit Bus design in my own project?
The repository has no license, so all rights stay with DragonMinded. Use it as a reference, and ask the author before reusing the design.
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