Zx50 MemoryCard RevA1

mmosko·Zx50·boards/Zx50_MemoryCard_RevA1/Zx50_MemoryCard_RevA1.kicad_pcb

Zx50 MemoryCard RevA1 PCB layout, top view — open source board by mmosko

About the Zx50 MemoryCard RevA1 PCB

Zx50 MemoryCard RevA1 is an open source PCB design by mmosko, published on GitHub. It is a 4-layer board measuring 123.4 × 129.8 mm, with 6 components from 6 distinct parts.

Other key parts include the 74CBTD3861. By type, the board carries 2 connectors, 1 IC, 1 switch, 1 diode and 1 resistor.

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 MemoryCard RevA1

74CBTD3861

Zx50 MemoryCard RevA1 bill of materials (BOM)

6 components, 6 distinct parts — part numbers from the project's BOM.

Qty	Part	Footprint	Refs
1	74CBTD3861 SST39SF040	DIP-32_W15.24mm_Socket	U12
1	ZX50_EDGECONNECTOR Zx50_EdgeConnector	PinSocket_2x40_P2.54mm_Horizontal_Edge	J1
1	JTAG	IDC-Header_2x05_P2.54mm_Vertical	J2
1	SW_DIP_x05	SW_DIP_SPSTx05_Slide_9.78x14.88mm_W7.62mm_P2.54mm	SW1
1	LED	LED_D3.0mm_Horizontal_O1.27mm_Z2.0mm	D2
1	10K	R_Array_SIP6	RN1

Zx50 MemoryCard RevA1 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 MemoryCard RevA1: common questions

How big is the Zx50 MemoryCard RevA1 PCB?

The Zx50 MemoryCard RevA1 measures 123.4 × 129.8 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Zx50 MemoryCard RevA1?

6 components, from 6 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 MemoryCard RevA1 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 MemoryCard RevA1 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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