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68k nano single board computer

demik·oldworld·EDA/68k-nano+/68000sbc.kicad_pcb

68k nano single board computer layout, top view — open source board by demik
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About the 68k nano single board computer

68k nano single board computer is an open source PCB design by demik, published on GitHub under the CERN-OHL-P-2.0 license. It is a 2-layer board measuring 127 × 90.8 mm, with 49 components from 35 distinct parts.

Other key parts include the LF347, OPA1688, AS6C4008-55PCN, 28C256 and TL16C550. By type, the board carries 13 capacitors, 10 resistors, 9 ICs, 6 connectors, 6 diodes and 2 crystals.

It belongs with the retro computing designs in this gallery.

From the project

Development ressources for Old World Macintosh (68k and NuBus PPC) and a few related things…

A minimal single-board computer based on the venerable "Texas Cockroach" Motorola 68000 16/32-bit microprocessor.

This is a variant from the original that Matt Sarnoff designed and published "here".

It was created to use 16550 UARTs in PLCC-44 form that are avaiable brand new instead of playing the lottery with old parts (the DIP variant from the original board isn't manufactured anymore)

68k nano single board computer, from the project README
From the project README

Main components on the 68k nano single board computer

LF347OPA1688AS6C4008-55PCN28C256TL16C550CD40107BE

68k nano single board computer bill of materials (BOM)

49 components, 35 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
LF347
74HC139
U1
1
LF347
74HC14
U2
1
OPA1688
TMP68HC000P-12
U3
2
AS6C4008-55PCN
U4, U6
2
28C256
U5, U7
1
TL16C550
U8
1
CD40107BE
U9
1
12MHz
X1
1
12MHz
X2
1
70553-0038
Amphenol 61729
J1
1
SJ1-3535NG-GR
5V FTDI SERIAL
J2
1
SJ1-3535NG
RTC (SparkFun BOB-10160)
J3
1
CONN_01X02
CFCARD/IDE
J4
1
CONN_01X02
EXPANSION (F.Cu)
J5
1
SJ1-3535NG-BE
EXPANSION (B.Cu)
J6
1
POWER SELECT
JP1
1
RESET
SW1
1
BTN1
SW2
2
1N5817
D1, D2
1
POWER
D3
Show 15 more
QtyPartRefs
1
LED
D4
1
CARD
D5
1
1N4148W
HALT
D6
6
100NF
0.1uF
C1, C2, C3, C4, C7, C8
2
47PF
0.1uF
C5, C6
2
100UF
0.1uF
C9, C10
2
100NF
10uF
C11, C12
1
0.1uF
C13
2
10k
R1, R2
1
10K
1k
R3
2
20K
1k*
R4, R6
1
10K
1k*
R5
1
680
1k*
R7
2
680
1k
R8, R9
1
10k
RN1

68k nano single board computer design files

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

68k nano single board computer: common questions

How big is the 68k nano single board computer?

The 68k nano single board computer measures 127 × 90.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the 68k nano single board computer?

49 components, from 35 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 68k nano single board computer design files?

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

Can I use the 68k nano single board computer design in my own project?

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

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