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Zx50 Backplane RevD

mmosko·Zx50·boards/Zx50_Backplane_RevD/Zx50_Backplane_RevD.kicad_pcb

Zx50 Backplane RevD PCB layout, top view — open source board by mmosko

About the Zx50 Backplane RevD PCB

Zx50 Backplane RevD is an open source PCB design by mmosko, published on GitHub. It is a 4-layer board measuring 210.8 × 137.2 mm, with 57 components from 10 distinct parts.

By type, the board carries 28 resistors, 16 connectors and 13 capacitors.

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).

Zx50 Backplane RevD bill of materials (BOM)

57 components, 10 distinct parts — part numbers from the project's BOM.

QtyPartRefs
16
47PF
47pF
CN1, CN2, CN3, CN4, CN5, CN6, CN7, CN8 +8
8
0.1UF
0.1uF
C2, C3, C4, C5, C6, C7, C8, C9
4
47PF
47pF
C10, C12, C13, C14
1
27PF
27pF
C11
6
10K
R1, R5, R6, R7, R11, R12
5
100R
R2, R3, R8, R9, R10
1
470
R4
8
100R
RN1, RN3, RN4, RN8, RN9, RN11, RN13, RN15
6
10K
RN2, RN10, RN12, RN14, RN16, RN17
2
2.2K
RN5, RN6

Zx50 Backplane RevD 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 Backplane RevD: common questions

How big is the Zx50 Backplane RevD PCB?

The Zx50 Backplane RevD measures 210.8 × 137.2 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Zx50 Backplane RevD?

57 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 Zx50 Backplane RevD 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 Backplane RevD 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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