HardLabs

ZX-Max-128-Issue-3A

liveboxandy·ZX-Max-128-Issue-3A

ZX-Max-128-Issue-3A PCB layout, top view — open source ESP8266 board by liveboxandy

About the ZX-Max-128-Issue-3A PCB

ZX-Max-128-Issue-3A is an open source ESP8266 PCB design by liveboxandy, published on GitHub. It is a 2-layer board measuring 213 × 84.8 mm, with 162 components from 52 distinct parts.

Its main chip is the ESP8266-12E, from the ESP8266 family. Other key parts include the Z80, AT27C256R-45PU, AS6C1008-55PCN, EPM7128SLC and 74HC04. By type, the board carries 79 resistors, 35 capacitors, 20 diodes, 12 ICs, 10 connectors and 2 transistors.

It belongs with the retro computing designs in this gallery.

From the project

KiCAD created files for the ZX Max 128 Issue 3A designed by DonSuperfo

This Kicad project has only been done so as to allow for a proper ibom that includes tracks and vias to be created so as to make assembling easier.

I have tried to ensure that the footprints were located as close as possible to those in the original as well trying to follow the existing track and via locations. Some of the footprints that were downloaded from Digikey based on the parts in the official BOM do not fit exactly in their locations on the board. C15 is one example, I had to modify it's footprint to fit the pad dimensions. Some other capacitors also do not fit correctly but appear…

Main components on the ZX-Max-128-Issue-3A

Z80AT27C256R-45PUAS6C1008-55PCNEPM7128SLC74HC04R-78E5.0-1.0AY-3-8910SN74HC174NAD724JRZ3V3 1AmpESP8266-12E

ZX-Max-128-Issue-3A bill of materials (BOM)

162 components, 52 distinct parts.

QtyPartRefs
1
Z80
U1
1
AT27C256R-45PU
EEPROM/EPROM 32Kx8
U2
1
AS6C1008-55PCN
U3
1
AS6C1008-55PCN
U4
1
EPM7128SLC
U5
1
74HC04
U6
1
R-78E5.0-1.0
U7
1
AY-3-8910
U8
1
SN74HC174N
U9
1
AD724JRZ
U11
1
3V3 1Amp
U12
1
ESP8266-12E
U15
2
Transistor BC548
Q9, Q10
1
28.375Mhz
Y1
1
4.433Mhz
Y2
1
8 Pin FFC Connector
J1
1
5-520315-5
5 Pin FFC Connector
J2
1
ZX_48K_EDGE
J3
1
PJ-002A
J4
1
AV Jack
J5
Show 32 more
QtyPartRefs
1
Connector Audio 3525N
J6
1
Connector 9 Pin Mini DIN
J8
1
Conn_02x02_Odd_Even
J10
1
CON2
J11
1
Header 5x2
J14
1
Speaker
LS1
1
Switch 6x6 RA
SW1
19
1N4148
D1, D2, D4, D5, D6, D7, D8, D9 +11
1
DF02M
D21
7
ECA-1EM100B
10uF 25V
C1, C2, C3, C4, C20, C21, C27
1
ECA-1EM100B
22uF 16V
C5
2
27pF
C6, C7
16
K104Z15Y5VF5TL2
100nF
C8, C9, C10, C11, C12, C13, C14, C16 +8
1
K104Z15Y5VF5TL2
100nF
C15
2
K104Z15Y5VF5TL2
3n3 50V
C19, C35
1
K104Z15Y5VF5TL2
10pF
C25
4
220uF 16V
C28, C29, C30, C32
1
K104Z15Y5VF5TL2
10nF 50V
C33
31
470R
R1, R2, R7, R9, R12, R32, R36, R56 +23
15
10K0
R3, R4, R5, R6, R15, R16, R24, R25 +7
1
2K70
R8
1
1M00
R10
5
1K00
R11, R50, R53, R54, R55
5
68R0
R14, R18, R23, R26, R29
2
4K7
R17, R22
6
150R
R19, R20, R21, R34, R38, R43
1
33K0
R33
6
75R0
R39, R40, R41, R42, R86, R87
2
150K
R44, R46
2
2K20
R51, R52
1
470K
R85
1
10K
RN1

ZX-Max-128-Issue-3A design files

The KiCad project lives in the liveboxandy/ZX-Max-128-Issue-3A repository on GitHub; these links point at the commit this page was built from.

ZX-Max-128-Issue-3A: common questions

What microcontroller does the ZX-Max-128-Issue-3A use?

The ZX-Max-128-Issue-3A is built around the ESP8266-12E, from the ESP8266 family.

How big is the ZX-Max-128-Issue-3A PCB?

The ZX-Max-128-Issue-3A measures 213 × 84.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the ZX-Max-128-Issue-3A?

162 components, from 52 distinct parts. The full bill of materials is listed on this page.

Where can I download the ZX-Max-128-Issue-3A design files?

From the liveboxandy/ZX-Max-128-Issue-3A repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the ZX-Max-128-Issue-3A design in my own project?

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

Can I test firmware for the ZX-Max-128-Issue-3A without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP8266 firmware against it before you order a PCB.

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