HardLabs

Z80ROMlessSBC

gloveboxes·Z80ROMlessSBC·hardware/kicad/z80_romless_sbc.kicad_pcb

Z80ROMlessSBC PCB layout, top view — open source RP2040/RP2350 board by gloveboxes
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About the Z80ROMlessSBC PCB

Z80ROMlessSBC is an open source RP2040/RP2350 PCB design by gloveboxes, published on GitHub under the MIT license. It is a 4-layer board measuring 160 × 135 mm, with 51 components from 26 distinct parts.

Its main chip is the Raspberry Pi Pico 2 W, from the RP2040/RP2350 family. Other key parts include the Z84C0020PEC, AS6C1008-55PCN, ATF22V10B/C, SN74AHCT244N and SN74LVC244AN. By type, the board carries 20 resistors, 12 capacitors, 8 ICs, 7 test points, 1 module and 1 transistor.

It belongs with the retro computing designs in this gallery.

From the project

This directory contains the KiCad 10 schematic and the routed four-layer PCB. The board is 160 x 135 mm and uses socket-compatible through-hole footprints. The Pico 2 W is horizontal in the bottom-left corner with USB flush to the left edge; its antenna sits above a dedicated int

This directory contains the KiCad 10 schematic and the routed four-layer PCB. The board is 160 x 135 mm and uses socket-compatible through-hole footprints. The Pico 2 W is horizontal in the bottom-left corner with USB flush to the left edge; its antenna sits above a dedicated internal FR-4/copper cutout.

This is a separate physical implementation from the three-BB830 prototype. See the dedicated PCB documentation for its inventory, design considerations, and fabrication references. The documentation's Phase 0-10 installation and jumper-wiring sequence remains the breadboard plan. Share…

Main components on the Z80ROMlessSBC

Z84C0020PECAS6C1008-55PCNATF22V10B/CSN74AHCT244NSN74LVC244ANMCP23S17-E/SPSN74AHCT245N Pico-to-busSN74LVC245AN bus-to-PicoRaspberry Pi Pico 2 W

Z80ROMlessSBC bill of materials (BOM)

51 components, 26 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
Z84C0020PEC
U1
1
AS6C1008-55PCN
U2
1
ATF22V10B/C
U3
1
SN74AHCT244N
U4
1
SN74LVC244AN
U7
1
MCP23S17-E/SP
U8
1
SN74AHCT245N Pico-to-bus
U9
1
SN74LVC245AN bus-to-Pico
U10
1
Raspberry Pi Pico 2 W
A1
1
2N3904 MCP RESET
Q1
1
REGULATED 5V INPUT
J1
1
M1# TEST
TP1
1
CLK TEST
TP2
1
RESET# TEST
TP3
1
WAIT# TEST
TP4
1
BUSREQ# TEST
TP5
1
BUSACK# TEST
TP6
1
GND TEST
TP7
1
1N5819
D1
8
100n
C1, C2, C3, C4, C5, C6, C7, C8
Show 6 more
QtyPartRefs
3
22u
C9, C10, C11
1
100u
C12
9
10k
R17, R18, R19, R20, R21, R22, R27, R28 +1
5
4.7k
R23, R24, R25, R26, R29
1
47k
R30
5
8x10k bussed
RN1, RN2, RN3, RN4, RN5

Z80ROMlessSBC design files

The KiCad project lives in the gloveboxes/Z80ROMlessSBC repository on GitHub; these links point at the commit this page was built from.

Z80ROMlessSBC: common questions

What microcontroller does the Z80ROMlessSBC use?

The Z80ROMlessSBC is built around the Raspberry Pi Pico 2 W, from the RP2040/RP2350 family.

How big is the Z80ROMlessSBC PCB?

The Z80ROMlessSBC measures 160 × 135 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Z80ROMlessSBC?

51 components, from 26 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 Z80ROMlessSBC design files?

From the gloveboxes/Z80ROMlessSBC 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 Z80ROMlessSBC design in my own project?

Yes, under the terms of its MIT license, which gloveboxes chose for the repository.

Can I test firmware for the Z80ROMlessSBC 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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