2 layers216.4 × 106.7 mm
2 layers157.5 × 73.9 mm
8086 ISA ver2
homebrew8088/8086-PC-Compatible278086 PC Compatible
- Size
- 157.5 × 73.9 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 50
- Nets
- 176
- Pads
- 487
- Tracks, vias
- 1,857, 343
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 6 Dec 2021
- Updated
- 6 May 2025
Overview
8086 ISA ver2 is an open-source printed circuit board by homebrew8088, from the homebrew8088/8086-PC-Compatible repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 157.5 × 73.9 mm with 50 parts on 176 nets, routed with 1,857 tracks and 343 vias.
It is built around the 74LS245SC, 74LS125DC and 74LS573PC, with the 74LS04PC, 74LS139PC and 74LS161DC among its other parts. Its parts include 16 capacitors, 15 ICs, 5 resistors, 3 connectors and 1 switch.
Main components
774LS245SC
-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, Transceivers74LS125DC
-0℃~+70℃ 1 10ns@5.5V,50pF 15mA 18mA 24mA 4 4.5V~5.5V 74LS Power-off isolation、Output enable Tri-State Unidirectional - Buffers, Drivers, Receivers, TransceiversTexas InstrumentsBuffers, Drivers, Receivers, Transceivers
74LS573PC
DIP-200℃~+70℃ 10ns 3ns 4.75V~5.25V 74LS 8 D Latch Tri-State DIP-20 Latches ROHSTexas InstrumentsLatches
74LS04PC
PDIP-140℃~+70℃ 4.75V~5.25V 6 6.6mA 74LS PDIP-14 InvertersonsemiInverters
74LS139PC
PDIP-1622ns 74LS 8mA Decoder Single Supply PDIP-16 Signal Switches, Multiplexers, DecodersonsemiSignal Switches, Multiplexers, Decoders
74LS161DC
-0℃~+70℃ 14ns 32MHz 4 4.75V~5.25V 74LS 93mW Asynchronous Binary Counter Programmable divide ratio、Reset function、Cascade counter、Synchronous counting Rising Edge Synchronous - Counters, DividersTexas InstrumentsCounters, Dividers74LS257PC
DIP-160℃~+70℃ 12mA 2.6mA 24mA 27ns@5V,150pF 4.75V~5.25V 74LS Output enable high-impedance、Tri-state output DIP-16 Signal Switches, Multiplexers, DecodersTexas InstrumentsSignal Switches, Multiplexers, Decoders
README
README.md8086 PC Compatible
This is a repository for my 8086 PC Compatible project developed in 2021. The Motherboard is built to be generally PC XT/AT compatible.
THIS DOES NOT WORK CORRECTLY FOR REFERENCE ONLY
https://www.homebrew8088.com
http://www.ebay.com/sch/emil6190/m.html
Features:
-8086, NEC V30
-512k RAM (This can be changed)
-16 Bit ISA Slots
-PC Speaker
-USB "Hard Drive"
-PS/2 Keyboard
-ATX form factor
-Add on DMA controller (Has not been built)
This project is very closely related to my other 8088 PC Compatible project https://github.com/homebrew8088/8088-PC-Compatible
Parts
50| Qty | Value | Footprint | References |
|---|---|---|---|
| 15 | 0.1uF | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C1, C2, C3, C4, C5, C6, C7, C8, C9, C11, C12, C13, C14, C16, C18 |
| 4 | 5.1K ohm | Resistor_THT:R_Array_SIP4 | RN1, RN3, RN4, RN5 |
| 4 | 74LS573 | Package_DIP:DIP-20_W7.62mm | U2, U3, U6, U14 |
| 3 | 74LS245 | Package_DIP:DIP-20_W7.62mm | U4, U9, U11 |
| 2 | , | ||
| 2 | 510 ohm | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R3, R4 |
| 2 | L | Motherboard:Large_Via | R, R |
| 1 | 10K ohm | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R5 |
| 1 | 27 ohm | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2 |
| 1 | 27C512 | Package_DIP:DIP-28_W15.24mm | U18 |
| 1 | 4.7uF | Capacitor_THT:CP_Radial_D4.0mm_P1.50mm | C25 |
| 1 | 5.1K ohm | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R6 |
| 1 | 5.1K ohm | Resistor_THT:R_Array_SIP5 | RN2 |
| 1 | 74LS04 | Package_DIP:DIP-14_W7.62mm | U17 |
| 1 | 74LS125 | Package_DIP:DIP-14_W7.62mm | U13 |
| 1 | 74LS139 | Package_DIP:DIP-16_W7.62mm | U16 |
| 1 | 74LS161 | Package_DIP:DIP-16_W7.62mm | U7 |
| 1 | 74LS257 | Package_DIP:DIP-16_W7.62mm | U8 |
| 1 | 8086 | Package_DIP:DIP-40_W15.24mm | U5 |
| 1 | 8284 | Package_DIP:DIP-18_W7.62mm | U1 |
| 1 | Bus_ISA_8bit | My:BUS_8_BIT | J9 |
| 1 | Conn_02x08_Counter_Clockwise | My:16_EDGE_CARD_BUS | J1 |
| 1 | Conn_02x18_Counter_Clockwise | My:36_EDGE_CARD_BUS | J2 |
| 1 | Crystal | Crystal:Crystal_HC18-U_Vertical | Y1 |
| 1 | RESET | Button_Switch_THT:SW_PUSH_6mm | SW1 |
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Questions
How big is the 8086 ISA ver2 PCB?
It measures 157.5 × 73.9 mm and has 2 copper layers, 1.6 mm thick.
What parts does the 8086 ISA ver2 use?
50 parts, built around the 74LS245SC, 74LS125DC, 74LS573PC and 74LS04PC. 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 8086 ISA ver2 KiCad files?
From the homebrew8088/8086-PC-Compatible repository on GitHub, at the commit this page was made from: the board is Kicad/8086 ISA ver2/8086.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the 8086 ISA ver2 design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).