CPU
About the CPU PCB
CPU is an open source PCB design by KALTCHUK, published on GitHub. It is a 2-layer board measuring 99.7 × 69.9 mm, with 29 components from 23 distinct parts.
Other key parts include the 74LS00, 74LS74 and Z80CPU. By type, the board carries 8 resistors, 7 capacitors, 6 connectors, 3 ICs, 3 diodes and 1 transistor.
It belongs with the retro computing designs in this gallery.
From the project
"Anyone who has brought up CP/M on a homebuilt computer has felt this moment of elation. A myriad of connections are properly closed; bits are flying at lightning speeds over busses and through circuits and program logic, to produce a single prompt". Gary Kildall
Main components on the CPU
CPU bill of materials (BOM)
29 components, 23 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 74LS00 | DIP-14_W7.62mm_Socket_LongPads | U1 |
| 1 | 74LS74 | DIP-14_W7.62mm_Socket_LongPads | U2 |
| 1 | Z80CPU | DIP-40_W15.24mm_Socket_LongPads | U3 |
| 1 | BC328 | TO-92_Inline | Q1 |
| 1 | 4MHz | Crystal_HC49-U_Vertical | Y1 |
| 1 | Signal Bus | PinHeader_2x20_P2.54mm_Vertical | J1 |
| 1 | Power Bus | PinHeader_2x05_P2.54mm_Vertical | J2 |
| 1 | INT | PinHeader_2x01_P2.54mm_Vertical | J3 |
| 1 | EXT RESET/INT | PinHeader_2x02_P2.54mm_Vertical | J4 |
| 1 | Reset | PinHeader_2x01_P2.54mm_Vertical | J5 |
| 1 | clock selector | PinHeader_2x03_P2.54mm_Vertical | J6 |
| 2 | LED | LED_D3.0mm | D1, D3 |
| 1 | 1N4148 | D_DO-35_SOD27_P7.62mm_Horizontal | D2 |
| 3 | 10n | C_Disc_D3.8mm_W2.6mm_P2.50mm | C1, C2, C3 |
| 2 | 10uF | CP_Radial_D5.0mm_P2.50mm | C4, C7 |
| 1 | 22p | C_Disc_D3.8mm_W2.6mm_P2.50mm | C5 |
| 1 | 100n | C_Disc_D3.8mm_W2.6mm_P2.50mm | C6 |
| 2 | 330R | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R2 |
| 2 | 270 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R3, R6 |
| 1 | 100 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R4 |
Show 3 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 10k | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R5 |
| 1 | 3.3k | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R7 |
| 1 | 4x10k | R_Array_SIP5 | RN1 |
CPU design files
The KiCad project lives in the KALTCHUK/Z80_Modular_Computer repository on GitHub; these links point at the commit this page was built from.
CPU: common questions
How big is the CPU PCB?
The CPU measures 99.7 × 69.9 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the CPU?
29 components, from 23 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 CPU design files?
From the KALTCHUK/Z80_Modular_Computer 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 CPU design in my own project?
The repository has no license, so all rights stay with KALTCHUK. Use it as a reference, and ask the author before reusing the design.
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