2 layers116.8 × 154.9 mm
2 layers170.2 × 154.9 mm
Isa16 backplane
UzixLS/pc-isa16-backplane11Compact ISA 16-bit backplane board
- Size
- 170.2 × 154.9 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 87
- Nets
- 116
- Pads
- 963
- Tracks, vias
- 3,351, 55
- Pours
- 10
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 29 May 2023
- Updated
- 17 Jun 2026
Overview
Isa16 backplane is an open-source printed circuit board by UzixLS, from the UzixLS/pc-isa16-backplane repository on GitHub. It is a 2-layer board of 170.2 × 154.9 mm with 87 parts on 116 nets, routed with 3,351 tracks and 55 vias.
It is built around the 74HCT14D and 74HCT74D. Its parts include 47 capacitors, 9 resistors, 7 diodes, 3 ICs and 3 connectors.
Main components
2
74HCT14D
SOP-14-40℃~+125℃ 1 1.9V~2.1V 2uA 34ns@4.5V,50pF 4.4V 4.5V~5.5V 400mV 4mA 4mA 500mV~600mV 6 74HCT Schmitt trigger SOIC-14 Inverters ROHSNexperiaInverters74HCT74D
SOIC-14-40℃~+125℃ 1 2 3.5pF 3ns 4.5V~5.5V 40uA 44ns@4.5V,50pF 4mA 4mA 59MHz 5ns 74HCT Series Asynchronous Complementary D-Type Rising Edge Set and Reset SO-14 Flip Flops ROHSNexperia74 Series
README
README.mdISA16-BACKPLANE
Compact ISA 16-bit backplane board
Specs:
- 171x155mm
- 7 ISA 16-bit (98 pin) slots
- ATX 20 pin power supply connector
- ATX power control circuit
- LEDs for +5V, +12V, -5V, -12V and standby power rails
- Power button
- Headers for power button and +5V power led
Changelog
- Rev.A - first release
- Rev.A1 - ATX connector changed from 5.5mm to 4.4mm and rotated 180°
See also
Parts
87| Qty | Value | Footprint | References |
|---|---|---|---|
| 44 | 10uF | PCM_Capacitor_THT_AKL:CP_Radial_Tantal_D5.0mm_P5.00mm | C2, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, C21, C22, C23, C24 +28 |
| 10 | MountingHole_Pad | MountingHole:MountingHole_4mm_Pad_Via | H1, H2, H3, H4, H5, H6, H7, H8, H9, H10 |
| 7 | SL-98 | my:ISA16 | BUS1, BUS2, BUS3, BUS4, BUS5, BUS6, BUS7 |
| 5 | 470 | PCM_Resistor_THT_AKL:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R4, R7, R8, R9 |
| 5 | LED | LED_THT:LED_D5.0mm | D1, D2, D3, D4, D5 |
| 2 | 1.5k | PCM_Resistor_THT_AKL:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R5, R6 |
| 2 | 100n | PCM_Capacitor_THT_AKL:C_Disc_D8.0mm_W2.5mm_P5.00mm | C1, C8 |
| 2 | 10k | PCM_Resistor_THT_AKL:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2, R3 |
| 2 | 1N4148 | PCM_Diode_THT_AKL:D_DO-35_SOD27_P7.62mm_Horizontal | D6, D7 |
| 2 | Conn_01x02 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J2, J3 |
| 1 | 1uF | PCM_Capacitor_THT_AKL:CP_Radial_Tantal_D5.0mm_P5.00mm | C9 |
| 1 | 74HCT14 | Package_DIP:DIP-14_W7.62mm | U1 |
| 1 | 74HCT74 | Package_DIP:DIP-14_W7.62mm | U2 |
| 1 | 7905 | my:TO-220-3_Horizontal_TabDownPin2 | U3 |
| 1 | ATX-20 | my:Conn_Power_ATX_20pin | J1 |
| 1 | SW_Push | Button_Switch_THT:SW_PUSH_6mm | SW1 |
Questions
How big is the Isa16 backplane PCB?
It measures 170.2 × 154.9 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Isa16 backplane use?
87 parts, built around the 74HCT14D and 74HCT74D. 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 Isa16 backplane KiCad files?
From the UzixLS/pc-isa16-backplane repository on GitHub, at the commit this page was made from: the board is pcb/rev.A/isa16_backplane.kicad_pcb and its schematic pcb/rev.A/isa16_backplane.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Isa16 backplane design in my own project?
Its repository states no licence, so its author keeps all rights: ask UzixLS before reusing the design.
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