Decoder Board
About the Decoder Board
Decoder Board is an open source PCB design by obiwanjacobi, published on GitHub under the Custom license license. It is a 2-layer board measuring 99.7 × 99.7 mm, with 215 components from 13 distinct parts.
Other key parts include the EPM240 and AP1117D33. By type, the board carries 80 diodes, 13 capacitors, 2 ICs, 2 connectors and 1 resistor.
It belongs with the retro computing designs in this gallery.
From the project
Zalt is a home brew Z80 computer with a modern(isch) chipset.
Zalt is a home brew Z80 computer with a modern(isch) chipset.
Disclaimer: Only at a very basic level does any of the BIOS code work - see tests. A lot of the source code is still being developed (and changed).
Main components on the Decoder Board
Decoder Board bill of materials (BOM)
215 components, 13 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | EPM240 | LQFP-100_14x14mm_Pitch0.5mm | U201 |
| 1 | AP1117D33 | SOT89-3_Housing_Handsoldering | U202 |
| 1 | JTAG | IDC_Header_Straight_10pins | P202 |
| 1 | DECHDR | IDC_Header_Straight_40pins | P203 |
| 1 | P*** | 1pin | 1PIN |
| 1 | BUSHDR-A | IDC_Header_Straight_40pins | HDR201 |
| 1 | BUSHDR-B | IDC_Header_Straight_40pins | HDR202 |
| 114 | — | R_0603_HandSoldering | Rs201, Rs202, Rs203, Rs204, Rs205, Rs206, Rs207, Rs208 +106 |
| 80 | — | SOD-123 | D201, D202, D203, D204, D205, D206, D207, D208 +72 |
| 1 | 10u | TantalC_SizeC_EIA-6032_HandSoldering | C101 |
| 11 | 100n | C_0603_HandSoldering | C102, C103, C201, C202, C203, C204, C205, C206 +3 |
| 1 | 22u | TantalC_SizeC_EIA-6032_HandSoldering | C104 |
| 1 | — | R_0603_HandSoldering | R200 |
Decoder Board design files
The KiCad project lives in the obiwanjacobi/Zalt repository on GitHub; these links point at the commit this page was built from.
Decoder Board: common questions
How big is the Decoder Board?
The Decoder Board measures 99.7 × 99.7 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Decoder Board?
215 components, from 13 distinct parts. The full bill of materials is listed on this page.
Where can I download the Decoder Board design files?
From the obiwanjacobi/Zalt repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the Decoder Board design in my own project?
It is published under Custom license, which limits how it may be reused; read the license before building on it.
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