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Z80DevBoard

gianluca-rainis·Z80DevBoard

Z80DevBoard PCB layout, top view — open source RP2040/RP2350 board by gianluca-rainis

About the Z80DevBoard PCB

Z80DevBoard is an open source RP2040/RP2350 PCB design by gianluca-rainis, published on GitHub under the CERN-OHL-S-2.0 license. It is a 4-layer board measuring 219 × 108.5 mm, with 179 components from 47 distinct parts.

Its main chip is the RP2040, from the RP2040/RP2350 family. Other key parts include the 74HC14, 74HC04, 74HC00 and TXS0104EPW. By type, the board carries 64 diodes, 61 resistors, 20 capacitors, 6 switches, 4 ICs and 3 connectors.

It belongs with the dev boards & breakouts and retro computing designs in this gallery.

From the project

An advanced development board for the Z80 microprocessor, powered by an RP2040.

The Z80DevBoard is an advanced development board for the Z80 microprocessor, based on the RP2040.

This board is meant to be a practical educational tool, to help students learn how the Z80, one of the first CPUs and the foundation of all modern ones, works, and how to develop software for it.

To the Z80 is combined a modern RP2040, a powerful microcontroller designed by Raspberry Pi. It allows easy interaction with the board's components: you can load a program for the Z80 into RAM; or establish a serial connection with the computer to perform live operations, such as reading and writing to…

Z80DevBoard, from the project README
From the project README

Main components on the Z80DevBoard

74HC1474HC0474HC00TXS0104EPW

Z80DevBoard bill of materials (BOM)

179 components, 47 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
74HC14
U1
1
74HC04
U2
1
74HC00
U3
1
TXS0104EPW
U4
1
Crystal 12MHz 20pF
Y1
1
ASCO
Y2
1
Conn_01x02_Pin
J1
1
Conn_02x20_Top_Bottom
J2
1
Conn_02x10_Top_Bottom
J3
3
SN74LVC245APW
DataBus1, DataBus2, DataBus3
1
500mA
F1
1
W25Q32JVSS
Flash1
1
AMS1117-3.3
LDO1
4
74HCT574
LedMatrixAddress1, LedMatrixAddress2, LedMatrixRead1, LedMatrixWrite1
2
HM62256BLP
RAM1, RAM2
1
RP2040
RP2040
1
WAIT
SW1
1
RESET
SW2
1
Z80BOOT
SW3
1
RPBOOT
SW4
Show 27 more
QtyPartRefs
1
SW_Nidec_CAS-120A1
SW5
1
Z80_CLOCK
SW6
1
74HC165
ShiftRegisterIn2
3
74HC595
ShiftRegisterOut1, ShiftRegisterOut2, ShiftRegisterOut3
1
USB_C_Receptacle_USB2.0_14P
USB_C1
1
Z084000xP
Z80
1
BUSACK
D1
24
Diode
D3, D5, D7, D9, D11, D13, D15, D17 +16
9
READ
D31, D33, D35, D37, D39, D41, D43, D47 +1
9
WRITE
D32, D34, D36, D38, D40, D42, D44, D48 +1
1
HALT
D45
1
IORQ
D50
1
MREQ
D51
1
M1
D52
1
RFSH
D53
16
Matrix
D65, D66, D67, D68, D69, D70, D71, D72 +8
2
10uF
C1, C2
3
1uF
C3, C6, C9
13
0.1uF
C4, C5, C7, C10, C12, C13, C14, C15 +5
2
15pF
C8, C11
13
10k
R1, R2, R3, R5, R6, R15, R16, R17 +5
6
3.3k
R4, R7, R8, R9, R10, R11
2
5k
R12, R13
1
0
R14
2
27.4
R19, R38
36
1k
R20, R21, R22, R23, R24, R25, R26, R27 +28
1
470k
R54

Z80DevBoard design files

The KiCad project lives in the gianluca-rainis/Z80DevBoard repository on GitHub; these links point at the commit this page was built from.

Z80DevBoard: common questions

What microcontroller does the Z80DevBoard use?

The Z80DevBoard is built around the RP2040, from the RP2040/RP2350 family.

How big is the Z80DevBoard PCB?

The Z80DevBoard measures 219 × 108.5 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Z80DevBoard?

179 components, from 47 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 Z80DevBoard design files?

From the gianluca-rainis/Z80DevBoard 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 Z80DevBoard design in my own project?

Yes, under the terms of its CERN-OHL-S-2.0 license, which gianluca-rainis chose for the repository.

Can I test firmware for the Z80DevBoard without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.

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