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68k-SMT

transistorfet·computie·hardware/68k-SMT/68k-SMT.kicad_pcb

68k-SMT PCB layout, top view — open source board by transistorfet
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About the 68k-SMT PCB

68k-SMT is an open source PCB design by transistorfet, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 106.7 × 139.7 mm, with 64 components from 38 distinct parts.

Other key parts include the 74HC32, MC68010, 74HC14, 74HC05 and 74HC20. By type, the board carries 16 capacitors, 14 resistors, 12 ICs, 6 connectors, 6 jumpers and 5 diodes.

It belongs with the retro computing designs in this gallery.

From the project

A collection of 68k computer projects, including a unix-like operating system written in C that runs on them

The goal here was to learn surface mount soldering techniques so that I could attempt a 68030 based design. I had lots of $10 QFP package 68030s, but the PGA packages were about 4 times the price, plus about $10 CAD including shipping and duties for a PGA socket (which is this 128-pin 13x13 PGA socket

68k-SMT, from the project README
From the project README

Main components on the 68k-SMT

74HC32MC6801074HC1474HC0574HC2074HC138AM29F040HM628512MC68681

68k-SMT bill of materials (BOM)

64 components, 38 distinct parts.

QtyPartRefs
2
74HC32
U1, U5
1
MC68010
U2
1
74HC14
U3
1
74HC05
U4
1
74HC20
U6
1
74HC138
U7
2
AM29F040
U8, U9
2
HM628512
U10, U11
1
MC68681
U12
2
Crystal
Y1, Y2
1
ADBUS
J1
1
POWER
J2
1
SIGBUS
J3
1
Serial1
J4
1
Serial2
J5
1
CompactFlash
J6
1
ROMJMP
JP1
1
ROMACK
JP2
2
POWER
JP3, JP4
1
IRQ
JP5
Show 18 more
QtyPartRefs
1
IACK
JP6
1
RESET
SW1
1
IP2
SW2
1
IP3
SW3
1
HALT
D1
1
OP4
D2
1
OP5
D3
1
OP6
D4
1
OP7
D5
12
0.1uF
C1, C4, C5, C6, C7, C8, C9, C10 +4
1
470uF
C2
1
0.47uF
C15
1
15pF
C16
1
5pF
C17
5
10k
R6, R12, R15, R20, R21
6
1k
R9, R11, R16, R17, R18, R19
2
5.1k
R13, R14
1
10k
RN1

68k-SMT design files

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

68k-SMT: common questions

How big is the 68k-SMT PCB?

The 68k-SMT measures 106.7 × 139.7 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the 68k-SMT?

64 components, from 38 distinct parts. The full bill of materials is listed on this page.

Where can I download the 68k-SMT design files?

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

Can I use the 68k-SMT design in my own project?

Yes, under the terms of its GPL-3.0 license, which transistorfet chose for the repository.

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