Main board
About the Main board
Main board is an open source PCB design by emperor-hadrian, published on GitHub. It is a 2-layer board measuring 190 × 125 mm, with 48 components from 10 distinct parts.
Other key parts include the L7805. By type, the board carries 34 ICs, 13 resistors and 1 connector.
From the project
Design for a DIY computer
The timing will be completely redone: A single normal clock signal, not the stupid "AB Alternating" I made up for the original. The PC will be incremented and a new instruction fetched during any non-flow-control instructions except when the GPRAM is used and the PC is in the same RAM chip (the RAM chips have 15 address lines each) as whatever is being accessed. The bus timing will also be very flexible and will be faster when possible but still slow when the memory is being accessed twice for example. Bus read/write addresses are both now 5 bits. The WRITE/MOVE instruction formats will…
Main components on the Main board
Main board bill of materials (BOM)
48 components, 10 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ~ | PinHeader_1x11_P2.54mm_Vertical | U1 |
| 7 | ~ | PinHeader_1x23_P2.54mm_Vertical | U2, U3, U4, U5, U6, U7, U24 |
| 9 | ~ | DIP-14_W7.62mm | U8, U9, U14, U16, U23, U25, U28, U30 +1 |
| 4 | ~ | DIP-16_W7.62mm | U10, U11, U12, U13 |
| 1 | ~ | DIP-20_W7.62mm | U15 |
| 10 | ~ | jumper | U17, U18, U19, U20, U21, U22, U26, U27 +2 |
| 1 | L7805 | TO-220-3_Vertical | U29 |
| 1 | ~ | PinHeader_1x07_P2.54mm_Vertical | U34 |
| 1 | Barrel_Jack | BarrelJack_Horizontal | J1 |
| 13 | 1k | 0.4_pitch_resistor | R1, R2, R3, R4, R5, R6, R7, R8 +5 |
Main board design files
The KiCad project lives in the emperor-hadrian/stack_machine repository on GitHub; these links point at the commit this page was built from.
Main board: common questions
How big is the Main board?
The Main board measures 190 × 125 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Main board?
48 components, from 10 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 Main board design files?
From the emperor-hadrian/stack_machine 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 Main board design in my own project?
The repository has no license, so all rights stay with emperor-hadrian. Use it as a reference, and ask the author before reusing the design.
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