Basic3
About the Basic3 PCB
Basic3 is an open source PCB design by barbeque, published on GitHub under the CC-BY-NC-4.0 license. It is a 2-layer board measuring 72 × 50.8 mm, with 9 components from 7 distinct parts.
Other key parts include the SG-1000-CART, SG-1000-EXPANSION and SN76489AN. By type, the board carries 3 ICs, 3 jumpers, 2 capacitors and 1 switch.
It belongs with the retro computing designs in this gallery.
From the project
A homebrew Sega SG-1000, with an eye towards SC-3000 compatibility
This folder contains the kicad source files to construct a clone of the Sega SC-3000 BASIC IIIB cartridge that uses UM61512 SRAM instead of the original DRAM, which makes it also compatible with the SK-1100-equipped SG-1000.
Main components on the Basic3
Basic3 bill of materials (BOM)
9 components, 7 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | SG-1000-CART 27C512 | DIP-28_W15.24mm | U1 |
| 1 | SG-1000-EXPANSION SG-1000-Cart | CartridgeEdge | U2 |
| 1 | SN76489AN UM61512 | DIP-32_W7.62mm | U3 |
| 2 | Jumper_2_Bridged | SolderJumper-2_P1.3mm_Bridged2Bar_RoundedPad1.0x1.5mm | JP1, JP3 |
| 1 | SolderJumper_2_Bridged | SolderJumper-2_P1.3mm_Bridged2Bar_RoundedPad1.0x1.5mm | JP2 |
| 1 | 679-2428 SW_SPDT | PinHeader_1x03_P2.54mm_Vertical | SW1 |
| 2 | 1276-1099-1 0.1µF | C_Disc_D6.0mm_W2.5mm_P5.00mm | C1, C2 |
Basic3 design files
The KiCad project lives in the barbeque/sg1000 repository on GitHub; these links point at the commit this page was built from.
Basic3: common questions
How big is the Basic3 PCB?
The Basic3 measures 72 × 50.8 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Basic3?
9 components, from 7 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Basic3 design files?
From the barbeque/sg1000 repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the Basic3 design in my own project?
It is published under CC-BY-NC-4.0, which limits how it may be reused; read the license before building on it.
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