3-bit Dynamic ROM Enhancer
About the 3-bit Dynamic ROM Enhancer PCB
3-bit Dynamic ROM Enhancer is an open source PCB design by DragonMinded, published on GitHub. It is a 2-layer board measuring 99.1 × 61 mm, with 71 components from 15 distinct parts.
By type, the board carries 36 transistors, 21 resistors, 13 connectors and 1 capacitor.
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…
3-bit Dynamic ROM Enhancer bill of materials (BOM)
71 components, 15 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 36 | 2N2222 | TO-92_Inline | Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8 +28 |
| 3 | POWER | PinHeader_1x02_P2.54mm_Vertical | J1, J2, J3 |
| 1 | BIT1 | PinHeader_1x02_P2.54mm_Vertical | J4 |
| 1 | BIT2 | PinHeader_1x02_P2.54mm_Vertical | J5 |
| 1 | BIT3 | PinHeader_1x02_P2.54mm_Vertical | J6 |
| 1 | EN | PinHeader_1x01_P2.54mm_Vertical | J7 |
| 1 | D0 | PinHeader_1x01_P2.54mm_Vertical | J8 |
| 1 | D1 | PinHeader_1x01_P2.54mm_Vertical | J9 |
| 1 | POS1_CONFIG | PinHeader_2x03_P2.54mm_Vertical | J10 |
| 1 | POS2_CONFIG | PinHeader_2x03_P2.54mm_Vertical | J11 |
| 1 | POS3_CONFIG | PinHeader_2x03_P2.54mm_Vertical | J12 |
| 1 | POS4_CONFIG | PinHeader_2x03_P2.54mm_Vertical | J13 |
| 1 | 0.1uF | C_Disc_D4.3mm_W1.9mm_P5.00mm | C1 |
| 12 | 1K | R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R1, R2, R8, R9, R10, R15, R16, R17 +4 |
| 9 | 10K | R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R3, R4, R5, R6, R7, R11, R12, R13 +1 |
3-bit Dynamic ROM Enhancer design files
The KiCad project lives in the DragonMinded/minidragon repository on GitHub; these links point at the commit this page was built from.
3-bit Dynamic ROM Enhancer: common questions
How big is the 3-bit Dynamic ROM Enhancer PCB?
The 3-bit Dynamic ROM Enhancer measures 99.1 × 61 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the 3-bit Dynamic ROM Enhancer?
71 components, from 15 distinct parts. The full bill of materials is listed on this page.
Where can I download the 3-bit Dynamic ROM Enhancer 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 3-bit Dynamic ROM Enhancer 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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