8 open source boards using the 74HCT688
Real designs built with the 74HCT688, 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.
Monster fdc
skiselev
139.7 × 101.6 mm53 partsNo license78
Rc2014-82c55-ide
electrified
100 × 50 mm22 parts2LNo license28
ISA EMS 2Mb
hkzlab
104.1 × 102.9 mm41 parts2LCC-BY-NC-4.023
VDC-II
sam-falvo
63.5 × 102.6 mm21 parts4LMPL-2.017
Rc2014-ym2151
100 × 50 mm27 parts2LNo license9
Rc-640k
PickledDog
99.1 × 49.9 mm11 parts2LApache-2.03
KIM-1 RAMpager
123.4 × 134.6 mm65 parts2LCC-BY-NC-4.01
Alu
TomNisbet
102 × 96 mm40 parts2LMIT18
The 74HCT688 in open source designs
The gallery holds 8 open source boards using the 74HCT688 from 8 GitHub repositories; a typical one measures about 101 × 98.8 mm and carries around 34 components.
86% are two-layer designs, the rest use four layers or more, and 38% carry an open source license.
The most starred is Monster fdc by skiselev.
Parts used alongside the 74HCT688
What boards using the 74HCT688 are built for
74HCT688: common questions
Where can I find a 74HCT688 reference design?
Each of the 8 boards on this page is a real design using the 74HCT688. 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 74HCT688?
The 74HCT04, 74HCT245, 74HCT32, 74HCT573 and AS6C4008-55PCN appear in the most repositories here.
How big is a typical board using the 74HCT688?
The median is 101 × 98.8 mm, and 86% are two-layer designs.
What is the most popular open source board using the 74HCT688?
By GitHub stars, Monster fdc by skiselev, with 78 stars.
Can I simulate one of these boards using the 74HCT688 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.