HardLabs

BeanZee

PainfulDiodes·BeanZee·kicad/BeanZee.kicad_pcb

BeanZee PCB layout, top view — open source board by PainfulDiodes

About the BeanZee PCB

BeanZee is an open source PCB design by PainfulDiodes, published on GitHub under the MIT license. It is a 2-layer board measuring 103.6 × 79.8 mm, with 30 components from 20 distinct parts.

Other key parts include the 74LS244, 74LS32, 74LS04, Z80CPU and AT28C256-15PU. By type, the board carries 11 capacitors, 9 ICs, 5 connectors, 2 jumpers, 2 resistors and 1 switch.

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

From the project

A Z80 homebrew development board for experimentation

Z80 CPU, 10 MHz clock, a simple reset circuit, 32K ROM, 32K RAM, FTDI UM245R USB module and the necessary glue logic.

Connectors provided for interfacing with the Z80: address, data, read, write, IO request, memory request, clock and reset.

The internal clock may be overridden by an external clock, and the internal memory and USB module may also be disabled via jumpers so that external devices can be used, or additional memory and IO selection logic added.

BeanZee, from the project README
From the project README

Main components on the BeanZee

74LS24474LS3274LS04Z80CPUAT28C256-15PUUM245RECS-2200B-100 10MHzAS6C62256-55PCN

BeanZee bill of materials (BOM)

30 components, 20 distinct parts.

QtyPartRefs
1
74LS244
U1
2
74LS32
U2, U4
1
74LS04
U3
1
Z80CPU
U5
1
AT28C256-15PU
AT28C256 (32kB ROM)
U6
1
UM245R
U7
1
ECS-2200B-100 10MHz
U8
1
AS6C62256-55PCN
AS6C62256 (32kB SRAM)
U9
1
Address
J1
1
Data
J2
1
Control
J3
1
Power
J4
1
Reset
J5
1
IORQ_enable
JP1
1
MREQ_enable
JP2
1
Reset
SW1
10
0.1uF
C1, C2, C4, C5, C6, C7, C8, C9 +2
1
100uF
C3
1
220R
R1
1
10k
R2

BeanZee design files

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

BeanZee: common questions

How big is the BeanZee PCB?

The BeanZee measures 103.6 × 79.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the BeanZee?

30 components, from 20 distinct parts. The full bill of materials is listed on this page.

Where can I download the BeanZee design files?

From the PainfulDiodes/BeanZee repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the BeanZee design in my own project?

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

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