HardLabs

Z80DMA2

lynchaj·nhyodyne·Z80DMA2/Z80DMA2.kicad_pcb

Z80DMA2 PCB layout, top view — open source AVR/Arduino board by lynchaj
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About the Z80DMA2 PCB

Z80DMA2 is an open source AVR/Arduino PCB design by lynchaj, published on GitHub. It is a 2-layer board measuring 100 × 100 mm, with 59 components from 30 distinct parts.

Its main chip is the ATtiny13-20PU, from the AVR/Arduino family. Other key parts include the 74LS08, 74LS244, 74LS688, 74LS32 and 74LS04. By type, the board carries 17 capacitors, 16 ICs, 15 resistors, 4 diodes, 3 connectors and 2 relays.

It belongs with the retro computing designs in this gallery.

From the project

Modular Backplane Computer

Flash File System support -- requires 39SF040 Flash ROMs

Note: The Z80 DMA V2 board has not yet gone to PCB production however the differences between it and the Z80 DMA V1 board are very minor.

K2 Interrupt Selection, connect 1-2 for INT#, connect 2-3 for NMI#, default is none Note: pin 2 can be connected to Z80 Processor IM2 connector via flying lead

K1 is external DMA connector. Default is 2-3 closed, otherwise connected to DMA capable IO board

Main components on the Z80DMA2

74LS0874LS24474LS68874LS3274LS0474LS2774LS24174LS245DMA-PLCC-44-CMOSSN74LS07N74LS17574LS13974LS157ATtiny13-20PU

Z80DMA2 bill of materials (BOM)

59 components, 30 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
74LS08
U1
3
74LS244
U2, U7, U8
1
74LS688
U3
1
74LS32
U4
1
74LS04
U5
1
74LS27
U6
1
74LS241
U9
1
74LS245
U10
1
DMA-PLCC-44-CMOS
U11
1
SN74LS07N
U12
1
74LS175
U13
1
74LS139
U14
1
74LS157
U15
1
ATtiny13-20PU
U16
1
Z80 BUS BACKPLANE
P1
1
SPARES
P2
1
DAISY CHAIN
P3
1
ADDR DIR
JP2
1
EXT DMA
K1
1
INT SEL
K2
Show 10 more
QtyPartRefs
1
IO PORT ADDR
SW1
4
LED
D1, D2, D3, D4
16
0.1u
C1, C2, C3, C4, C5, C6, C7, C8 +8
1
47uF
C17
1
1K
R1
4
4K7
R2, R5, R6, R13
1
0R
R3
4
470R
R7, R12, R14, R15
4
1K8
R8, R9, R10, R11
1
4K7
RN1

Z80DMA2 design files

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

Z80DMA2: common questions

What microcontroller does the Z80DMA2 use?

The Z80DMA2 is built around the ATtiny13-20PU, from the AVR/Arduino family.

How big is the Z80DMA2 PCB?

The Z80DMA2 measures 100 × 100 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Z80DMA2?

59 components, from 30 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 Z80DMA2 design files?

From the lynchaj/nhyodyne repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Z80DMA2 design in my own project?

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

Can I test firmware for the Z80DMA2 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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