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UZ80

adzierzanowski·z80·schematics/uz8021/uZ80.kicad_pcb

UZ80 PCB layout, top view — open source AVR/Arduino board by adzierzanowski
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About the UZ80 PCB

UZ80 is an open source AVR/Arduino PCB design by adzierzanowski, published on GitHub. It is a 2-layer board measuring 231.4 × 159.9 mm, with 112 components from 20 distinct parts.

Its main chip is the ATmega328-PU, from the AVR/Arduino family. Other key parts include the Z80CPU, FT232RL, 74LS04, 74LS08 and CY62256-70PC. By type, the board carries 44 resistors, 37 diodes, 14 ICs, 6 LEDs, 6 capacitors and 3 crystals.

It belongs with the retro computing and displays & leds designs in this gallery.

From the project

Zilog Z80 (and Intel 8080) assembler/disassembler for everyone and some other tools for my private Z80 stuff

This is a scratchpad repository containing my Z80 sandbox.

The assembler is more-than-two-pass assembler to make code more readable than optimized.

I've also written a 2-pass Z80 assember in C which is much faster. Check it out here.

For now the other part of the project consists of:

a main board with 10 MHz Zilog Z80 CPU and some LEDs, a RAM board with two 62256 SRAM chips, 32 kiB of memory each and 7-segment displays showing data and address bus state, * a CLKMOD board acting as a clock and interrupt controller.

Main components on the UZ80

Z80CPUATmega328-PUFT232RL74LS0474LS08CY62256-70PCATmega2560-16AUMAX7219CAT24C32WI-GT3

UZ80 bill of materials (BOM)

112 components, 20 distinct parts.

QtyPartRefs
1
Z80CPU
U1
2
ATmega328-PU
U2, U8
1
FT232RL
U3
1
74LS04
U4
1
74LS08
U5
2
CY62256-70PC
U6, U7
1
ATmega2560-16AU
U9
1
MAX7219
U10
4
CAT24C32WI-GT3
U11, U12, U13, U14
3
16 MHz
Y1, Y2, Y3
1
Mini-DIN-6
J1
1
USB_B
J2
6
LTS-6980HR
AFF1, AFF2, AFF3, AFF4, AFF5, AFF6
37
LED
D1, D2, D3, D4, D5, D6, D7, D8 +29
6
22 pF
C1, C2, C3, C4, C5, C6
5
R
R1, R3, R4, R5, R6
1
1k
R2
35
100
R7, R8, R9, R10, R11, R12, R13, R14 +27
1
47k
R41
2
4.7k
R43, R44

UZ80 design files

The KiCad project lives in the adzierzanowski/z80 repository on GitHub; these links point at the commit this page was built from.

UZ80: common questions

What microcontroller does the UZ80 use?

The UZ80 is built around the ATmega328-PU, from the AVR/Arduino family.

How big is the UZ80 PCB?

The UZ80 measures 231.4 × 159.9 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the UZ80?

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

Where can I download the UZ80 design files?

From the adzierzanowski/z80 repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the UZ80 design in my own project?

The repository has no license, so all rights stay with adzierzanowski. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the UZ80 without the hardware?

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

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