29 open source boards using the 74LS688
Real designs built with the 74LS688, from public GitHub projects: a quick way to see how others power, decouple and connect it. Each board comes with its KiCad files, full parts list and a render — and you can simulate its firmware on HardLabs.
PICNuXT
monotech
184.9 × 243.8 mm214 parts4LGPL-3.0120
Z80VDP1B
lynchaj
100 × 100 mm93 parts2LNo license31
New enet
jayacotton
254 × 134.6 mm36 parts2LMIT21
PICNano8088
110.1 × 101.6 mm75 partsGPL-3.017
6809PC
danwerner21
244 × 244 mm155 parts2LNo license2
Z80-SOUND
dennis9819
160 × 100.3 mm104 parts2LNo license2
Z80VDP1A
100 × 100 mm90 parts2LNo license31- schematic only · 34 parts
S100 enet
34 parts2LMIT21 
Identity comparator
madworx
33.7 × 5.1 mm3 parts2LMIT10
RC202-68000 SIO 1
MarkD833
101.6 × 53.3 mm40 parts4LCC-BY-NC-4.08
Z80-TAPE
160 × 100.3 mm104 parts2LNo license2
Z80-VDP
160 × 100.3 mm77 parts2LNo license2
Z80DUART2
100 × 100 mm70 parts2LNo license31
Z80PRINT
100 × 100 mm66 parts2LNo license31
68000 LBE Board
101.6 × 53.3 mm34 parts4LCC-BY-NC-4.08
Z80PSG1
100 × 100 mm64 parts2LNo license31
68000 SIO BOARD
101.6 × 53.3 mm33 parts4LCC-BY-NC-4.08
Z80-IDE
160 × 100.3 mm62 parts2LNo license2
Z80VDC
100 × 100 mm63 parts2LNo license31
Z80-SID
160 × 100.3 mm62 parts2LNo license2
Z80SERIAL3
100 × 100 mm61 parts2LNo license31
Z80-MIDI
160 × 100.3 mm32 parts2LNo license2
AVR/ArduinoZ80DMA2
100 × 100 mm59 parts2LNo license31
68000 MPF BOARD
101.6 × 53.3 mm27 parts4LCC-BY-NC-4.08
007-MemoryExpansion
160 × 100.3 mm31 parts2LNo license2
Z80SERIAL2
100 × 100 mm59 parts2LNo license31
RC203-68000 PIO 1
101.6 × 53.3 mm24 parts4LCC-BY-NC-4.08
68000 PIO BOARD
101.6 × 53.3 mm23 parts4LCC-BY-NC-4.08
Z80RAM3
100 × 100 mm58 parts2LNo license31
The 74LS688 in open source designs
The gallery holds 29 open source boards using the 74LS688 from 8 GitHub repositories; a typical one measures about 101.6 × 100 mm and carries around 61 components.
75% are two-layer designs, the rest use four layers or more, and 17% carry an open source license.
The most starred is NuXT by monotech.
Parts used alongside the 74LS688
Microcontrollers on boards using the 74LS688
What boards using the 74LS688 are built for
74LS688: common questions
Where can I find a 74LS688 reference design?
Each of the 29 boards on this page is a real design using the 74LS688. Open one to see how it is wired up, with the full BOM, a render of the layout and links to its KiCad files.
What parts are used alongside the 74LS688?
The 74LS138, 74LS04, 74LS245, 74LS02 and 74LS06 appear in the most repositories here.
Which microcontrollers do boards using the 74LS688 use?
Most are built on PIC (2) and AVR/Arduino (1).
How big is a typical board using the 74LS688?
The median is 101.6 × 100 mm, and 75% are two-layer designs.
What is the most popular open source board using the 74LS688?
By GitHub stars, NuXT by monotech, with 120 stars.
Can I simulate one of these boards using the 74LS688 before building it?
Yes. HardLabs turns a board's netlist and BOM into a working simulation, so you can boot and test firmware against it with no hardware on your desk.