Zx50 Clock Mezzanine RevC
About the Zx50 Clock Mezzanine RevC PCB
Zx50 Clock Mezzanine RevC is an open source PCB design by mmosko, published on GitHub. It is a 4-layer board measuring 50.2 × 69.8 mm, with 38 components from 24 distinct parts.
Other key parts include the MC74VHC1G14DBVT1G, SN74AHC74DR, SN74ABT245BN, Z84C00XXP and CD74AC161M96. By type, the board carries 13 capacitors, 11 resistors, 10 ICs, 2 connectors, 1 crystal and 1 jumper.
From the project
The Zx50 is a custom 8-slot, passive backplane Z80 computer. It uses a "Shadow Bus" architecture where a Raspberry Pi Pico can take over the bus via DMA (~BUSRQ / ~BUSAK) to load RAM, debug, and monitor the system.
The Zx50 is a custom 8-slot, passive backplane Z80 computer. It uses a "Shadow Bus" architecture where a Raspberry Pi Pico can take over the bus via DMA (~BUSRQ / ~BUSAK) to load RAM, debug, and monitor the system.
* Backplane: 8 slots. Fully terminated with 10K SIP pull-up resistors on Address, Data, and Control lines. Includes an ~IEI/~IEO interrupt daisy chain and heavy bulk capacitance (1000µF).
Main components on the Zx50 Clock Mezzanine RevC
Zx50 Clock Mezzanine RevC bill of materials (BOM)
38 components, 24 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | MC74VHC1G14DBVT1G 74VHC1G14 | SOT-23-5_HandSoldering | U1 |
| 1 | SN74AHC74DR '74 Texas Instruments | SOIC-14_3.9x8.7mm_P1.27mm | U2 |
| 1 | SN74ABT245BN 1G08 | SOT-23-5_HandSoldering | U3 |
| 1 | Z84C00XXP 74AHC1G79 | SOT-23-5_HandSoldering | U4 |
| 1 | SN74ABT245BN 1G32 | SOT-23-5_HandSoldering | U5 |
| 1 | CD74AC161M96 | SOIC-16_3.9x9.9mm_P1.27mm | U6 |
| 1 | SN74ABT245BN '125 | SOIC-14_3.9x8.7mm_P1.27mm | U7 |
| 3 | MC74VHC1G14DBVT1G 1G14 | SOT-23-5_HandSoldering | U8, U9, U10 |
| 1 | SG-8002DC | DIP-8_W7.62mm_Socket | Y1 |
| 1 | Conn_02x05_Odd_Even | PinHeader_2x05_P2.54mm_Horizontal_Edge | J2 |
| 1 | Conn_Coaxial | BNC_Amphenol_B6252HB-NPP3G-50_Horizontal | J3 |
| 1 | CLOCK DIV | SolderJumper-3_P1.3mm_Open_RoundedPad1.0x1.5mm | JP1 |
| 4 | 0.1UF 0.1 uF | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C10, C11, C12 |
| 7 | 0.1UF 0.1uF | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C2, C3, C4, C5, C6, C7, C8 |
| 1 | 100UF 10uF | CP_Radial_Tantal_D5.0mm_P2.50mm | C9 |
| 1 | 10U 0.1 uF | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C13 |
| 1 | 470 10K | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1 |
| 1 | 10K | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R2 |
| 1 | 47K 49.9R | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R3 |
| 1 | 470 33R | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R4 |
Show 4 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 33R | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R5 |
| 4 | 4K7 33R | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R6, R9, R10, R11 |
| 1 | 10K 33R | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R7 |
| 1 | 33R | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R8 |
Zx50 Clock Mezzanine RevC design files
The KiCad project lives in the mmosko/Zx50 repository on GitHub; these links point at the commit this page was built from.
Zx50 Clock Mezzanine RevC: common questions
How big is the Zx50 Clock Mezzanine RevC PCB?
The Zx50 Clock Mezzanine RevC measures 50.2 × 69.8 mm, has 4 copper layers and is 0.19 mm thick.
How many components are on the Zx50 Clock Mezzanine RevC?
38 components, from 24 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 Zx50 Clock Mezzanine RevC design files?
From the mmosko/Zx50 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 Zx50 Clock Mezzanine RevC design in my own project?
The repository has no license, so all rights stay with mmosko. Use it as a reference, and ask the author before reusing the design.
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