2 layers145 × 85 mm
2 layers100 × 100 mm
Ioe enh
Creep69/NKC8Neuauflage des NDR KLEIN COMPUTER
- Size
- 100 × 100 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 507
- Nets
- 70
- Pads
- 768
- Tracks, vias
- 821, 17
- Routed
- Yes
- KiCad
- KiCad 4
- Created
- 20 Oct 2017
- Updated
- 25 Oct 2025
Overview
Ioe enh is an open-source printed circuit board by Creep69, from the Creep69/NKC repository on GitHub. It is a 2-layer board of 100 × 100 mm with 507 parts on 70 nets, routed with 821 tracks and 17 vias.
It is built around the 74LS245SC, 74LS374PC and 74LS139PC, with the 74LS32SC among its other parts. Its parts include 8 capacitors, 8 connectors and 1 switch.
Main components
474LS245SC
-0℃~+70℃ 12ns@5V,45pF 15mA 24mA 4.75V~5.25V 74LS 8 Bidirectional Output enable Schmitt trigger Tri-State - Buffers, Drivers, Receivers, Transceivers ROHSTexas InstrumentsBuffers, Drivers, Receivers, Transceivers
74LS374PC
PDIP-200ns 0℃~+70℃ 1 20ns 28ns@5V,45pF 35MHz 4.75V~5.25V 45mA 74LS Series 8 D-Type Rising Edge Tri-State PDIP-20 Flip FlopsonsemiFlip Flops
74LS139PC
PDIP-1622ns 74LS 8mA Decoder Single Supply PDIP-16 Signal Switches, Multiplexers, DecodersonsemiSignal Switches, Multiplexers, Decoders
74LS32SC
-- Logic Gates ROHSTexas InstrumentsLogic Gates
README
README.mdNKC
Neuauflage des NDR KLEIN COMPUTER
Hier sollen Hardware- und Softwareprojekte zum NDR Klein Computer ihren Platz finden.
Weitere Mitstreiter sind herzlich willkommen!
Links:
Parts
507| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | 100nF | Capacitors_ThroughHole:C_Disc_D3_P2.5 | C2, C3, C4, C5, C6, C7, C8 |
| 2 | 74LS245 | Housings_DIP:DIP-20_W7.62mm_LongPads | J2, J3 |
| 2 | 74LS374 | Housings_DIP:DIP-20_W7.62mm_LongPads | J4, J5 |
| 1 | 10µF | Capacitors_ThroughHole:C_Radial_D5_L6_P2.5 | C1 |
| 1 | 74LS139 | Housings_DIP:DIP-16_W7.62mm_LongPads | J6 |
| 1 | 74LS32 | Housings_DIP:DIP-14_W7.62mm_LongPads | J8 |
| 1 | 74LS688 | Housings_DIP:DIP-20_W7.62mm_LongPads | J7 |
| 1 | CONN_01X36 | nkc:NKC_BUS_36 | ST1 |
| 1 | CONN_02X20 | Pin_Headers:Pin_Header_Straight_2x20 | ST2 |
| 1 | PIN | Pin_Headers:Pin_Header_Straight_1x08 | P1 |
| 1 | RR8 | Resistors_ThroughHole:Resistor_Array_SIP8 | 8x3,3k |
| 1 | SW_DIP_x8 | Housings_DIP:DIP-16_W7.62mm_LongPads | S1 |
The 20 most common of 507 parts.
More from Creep69/NKC
2- 2 layers100 × 100 mm
Similar boards
- 2 layers231.1 × 106.7 mm
- 2 layers450 × 160 mm
- 2 layers158.8 × 91.4 mm
Nabu MEGAMAPPER
tergav17/Z80-MegaMapper
Z80 interposer board providing extended memory and I/O instruction mapping
42 parts1 - 4 layers103.7 × 78.5 mm
SnarkBarker
computerguy096/snark-barker-mini
A miniaturized version of the Snark Barker
180 partsCC-BY-SA-4.0 - 2 layers426 × 307 mm
I7000
felipesanches/Itautec_I7000_KICAD
Esquemáticos do computador Itautec I-7000 G desenhados a partir de inspeção do circuito das PCBs
115 parts - 2 layers190.5 × 77.5 mm
NinthWave512K
XekriRedmane/ninth_wave_256k
Reverse engineered Ninth Wave memory expansion board for Apple IIe.
69 partsMIT - 2 layers100 × 100 mm
- 2 layers203.4 × 139.1 mm
Tandy Color Computer Multi Pak
djtersteegc/Tandy-Color-Computer-Multi-Pak
Respin of the Tandy 26-3024 Multi-Pak (MPI) for the DIY builder.
70 parts16MIT
Questions
How big is the Ioe enh PCB?
It measures 100 × 100 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Ioe enh use?
507 parts, built around the 74LS245SC, 74LS374PC, 74LS139PC and 74LS32SC. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Ioe enh KiCad files?
From the Creep69/NKC repository on GitHub, at the commit this page was made from: the board is HW/IOE/kicad/ioe_enh.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Ioe enh design in my own project?
Its repository states no licence, so its author keeps all rights: ask Creep69 before reusing the design.