Boards using the 74LS21PC

40 boards

Boards in 34 GitHub repositories, designed in KiCad, that use the 74LS21PC by onsemi (0℃~+70℃ 18ns@5V,50pF 2 2.7V~3.4V 2V 4 4.75V~5.25V 400uA 500mV 74LS 800mV 8mA AND Gate DIP-14 Logic Gates ROHS). See how each wires it, with its parts, size, README and files; the 74LS21PC’s symbol, footprint and pinout are on its own page.

2 layers100 × 77.5 mm
SmartDiskII
btb/SmartDiskII
An hybrid Disk ][ and SmartPort controller
42 parts60Apache-2.0
4 layers239.4 × 165.7 mm
MAXI030
aslak3/MAXI030
MC68030 based expandable computer design
222 parts38GPL-2.0
4 layers340 × 210 mm
Yddraig
ddraig68k/hardware
Schematic and CAD files for my 68K based computer
224 parts29MIT
2 layers83.1 × 74.4 mm
MSXIOSlot
jedimatt42/MSXIOSlot
PCBoard design for an MSX expansion slot adapter to 1 full expansion slot + 1 IO Slot.
14 parts11Unlicense
4 layers99.9 × 100 mm
N8 bit special
nrivard/n8-Bit
65C02 Microcomputer
50 parts10MIT
2 layers281 × 79 mm
Qx10 titan clone
brijohn/qx10
Epson QX-10 Files
50 parts9
2 layers
NewBrain Original
flypie/NewBrain
Newbury/Grundy NewBrain schematics
209 parts5GPL-3.0
2 layers190 × 125 mm
68hc11
mggates39/68hc11_SBC
Building a Single Board Computer around the MC68HC11. It will include my first attempt with KiCad designing a PCB
58 parts4GPL-3.0
2 layers279.9 × 76.1 mm
AmdekDVM
schlae/AmdekDVM
Reverse engineering Amdek DVM video card for the Apple II
69 parts4CERN-OHL-P-2.0
4 layers304.5 × 217.2 mm
Latest Full Backplane
Trilobyte-CPU/8-bit-computer
A DIY 8-bit computer built mostly with discrete logic chips
478 parts2
2 layers221 × 179 mm
Sun6502
Aktr0s/Sun6502
My 6502 Hobby Computer
53 parts1
2 layers52.1 × 37.5 mm
Sg90 driver
jacks-hax/Jerry
Jerry's brains ;)
32 parts1GPL-3.0
4 layers236.8 × 240.9 mm
DIY Video
jimbro1000/DIY-Video
General purpose video system for 8-bit computers using 74LS logic
315 parts1
2 layers177.6 × 199.6 mm
Projet ELEC
theomagellan/elec
Kicad schematics for a simple stm32-base keyboard to morse device
105 parts1
2 layers77.5 × 42.5 mm
Eca kicad pcb
atupek/ca_circuit

18 parts
2 layers160 × 100.1 mm
ECB-4PIO
b1ackmai1er/ECB-4PIO-I2C
Retrobrew Computers ECB-4PIO-I2C development.
76 parts
12 layers94 × 127 mm
Aletheia
finitedevices/aletheia
Designs and resources for the Finite Aletheia: a versatile, 8-bit hand-bootstrapped computer.
85 parts
2 layers126.5 × 74.8 mm
VIC Cart 1
hansliss/VIC_Cart_1
A basic programmable RAM/ROM expansion for VIC-20
29 partsAGPL-3.0
2 layers62 × 50.5 mm
SaferErrorDelivery
hendlervossmyles-a11y/SaferErrorDelivery
Reduces error messages when multiple systems fail. This enables a machine operator to handle only only the highest priority error at a time.
12 parts
2 layers168.7 × 68.4 mm
DragonATXProtoUART
jimbro1000/DragonATXProtoUART

15 parts
2 layers128 × 95 mm
666katy
lkundrak/666katy
68katy-based board. *Not verified to work*
63 parts
2 layers200 × 100 mm
DAM Circuit
Magdamit173/DAM_Circuitry

103 parts
2 layers
Unbenannt
mStirner/klimasteuerung
Fensterkontakte Auswertung für Klimasteuerung
20 parts
2 layers253.2 × 203 mm
Pegasus2023
NeilsVintageComputers/1981_Aamber-Pegasus-2023-Revival
My first computer, this is a replica I produced from the original schematics using original old components.
156 partsUnlicense