HardLabs

OtterX

RetroRemake·OtterX·Vega_EV1/OtterX.kicad_pcb

OtterX PCB layout, top view — open source AVR/Arduino board by RetroRemake

About the OtterX PCB

OtterX is an open source AVR/Arduino PCB design by RetroRemake, published on GitHub under the CERN-OHL-W-2.0 license. It is a 4-layer board measuring 170.1 × 170.1 mm, with 168 components from 77 distinct parts.

Its main chip is the ATtiny861-20P, from the AVR/Arduino family. Other key parts include the W65C816S, W65C22S, 74LS06, 74AC10 and 74AHCT273. By type, the board carries 44 capacitors, 36 resistors, 26 diodes, 24 ICs, 21 connectors and 4 fuses.

It belongs with the retro computing designs in this gallery.

From the project

8-Bit computer compatible with Commander X16

An Open Source 6502-based, Commander X16-compatible, 8-bit Computer

Looking to order and build your own OtterX? Official kits are available from:

Main components on the OtterX

W65C816SW65C22S74LS0674AC1074AHCT273SST39SF040AS6C1008-55PCNAS6C4008-55PCN74ACT163ATtiny861-20PMCP7940N-xP74ACT0074AHCT0274AHCT0474AHCT3274AC2074AHCT138TL074YM2151YM3012LM324

OtterX bill of materials (BOM)

168 components, 77 distinct parts.

QtyPartRefs
1
W65C816S
U1
1
W65C22S
U2
1
74LS06
U3
1
74AC10
U4
2
74AHCT273
U5, U6
1
SST39SF040
U7
1
AS6C1008-55PCN
U8
1
AS6C4008-55PCN
U9
1
74ACT163
U11
1
ATtiny861-20P
U12
1
MCP7940N-xP
U13
1
74ACT00
U14
2
74AHCT02
U15, U17
1
74AHCT04
U16
1
74AHCT32
U18
2
74AC20
U19, U20
1
74AHCT138
U21
1
TL074
U22
1
YM2151
U24
1
YM3012
U25
Show 57 more
QtyPartRefs
1
LM324
U26
3
2N7000
Q1, Q2, Q3
1
ACH-16.000MHZ-EK
X1
1
ECS-2100AX-3.579545MHZ
X2
1
ECS-.327-6-13X
Y1
1
VERA_CONN
J1
1
VIA2 Header
J2
3
IDC_2x03
J3, J17, J21
1
YM CT Out
J5
1
Ext. NMI
J6
1
RTC GPIO
J7
1
I2C
J9
1
1.5MB RAM Expansion
J10
1
KMDGX-6SG
J11
1
VIA1 Extra Pins
J12
1
Flash WR EN
J14
1
ATX-24
J16
1
SNES0
J18
1
SNES1
J19
1
PS2 Pwr Src
J25
1
Front Panel
J26
1
EXTRAM_ENABLE
J27
1
AudioPlug3
J29
1
60 Pin Edge Conn
P1
1
BAT-HLD-001-THM
BT1
1
JK30
F1
1
RXEF110
F3
1
RXEF025
F4
1
RXEF010
F5
1
HK19F
K1
3
FSM4JH
SW1, SW2, SW3
12
1N4148
D1, D3, D6, D7, D8, D9, D10, D11 +4
1
1N5819
D2
1
LED_GRN
D4
1
LED_YEL
D5
10
P4KE6.8CA
D16, D20, D21, D22, D23, D24, D25, D26 +2
1
LED_RED
D18
1
FerriteBead_Small
FB1
1
470uH
L1
26
0.1u
C1, C2, C3, C4, C5, C6, C7, C8 +18
6
330p
C13, C14, C15, C18, C19, C20
2
3p
C16, C17
2
1n
C42, C43
2
MKS2B042201F00JSSD
2.2u
C46, C47
4
10u
C51, C52, C53, C57
2
3.3n
C55, C56
11
1K
R1, R2, R4, R5, R6, R13, R30, R31 +3
3
2K2
R3, R10, R12
3
560R
R7, R8, R28
6
10K
R9, R11, R16, R17, R19, R20
4
15K
R15, R18, R21, R22
3
100R
R23, R24, R27
1
390R
R29
1
2K2
RN1
2
2K2
RN2, RN3
1
3K3
RN4
1
2K2
RN5

OtterX design files

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

OtterX: common questions

What microcontroller does the OtterX use?

The OtterX is built around the ATtiny861-20P, from the AVR/Arduino family.

How big is the OtterX PCB?

The OtterX measures 170.1 × 170.1 mm, has 4 copper layers and is 1.5842 mm thick.

How many components are on the OtterX?

168 components, from 77 distinct parts. The full bill of materials is listed on this page.

Where can I download the OtterX design files?

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

Can I use the OtterX design in my own project?

Yes, under the terms of its CERN-OHL-W-2.0 license, which RetroRemake chose for the repository.

Can I test firmware for the OtterX 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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