2 layers89 × 100 mm
ISA 8bit Logic Analyser Breakout
BrettHallen/ISA_Breakout
Breakout board to simplify connecting an ISA card to a logic analyser.
17 parts2
2 layers155 × 100 mm
ISA Penta
BrettHallen/ISA_Breakout2Breakout board to simplify connecting an ISA card to a logic analyser.
- Size
- 155 × 100 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 33
- Nets
- 68
- Pads
- 382
- Tracks, vias
- 1,417, 0
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 28 Jan 2026
- Updated
- 2 Nov 2026
Overview
ISA Penta is an open-source printed circuit board by BrettHallen, from the BrettHallen/ISA_Breakout repository on GitHub. It is a 2-layer board of 155 × 100 mm with 33 parts on 68 nets, routed with 1,417 tracks and 0 vias.
Its parts include 15 capacitors, 6 connectors, 4 resistors, 1 diode and 1 switch. It belongs with the sensors and measurement boards of this library.
README
README.mdISA Backplane Boards
ISA Penta Backplane
An attempt at a simple, five-slot ISA board mainly aimed at getting the Multitech MPF-PC/500 CPU card working.
The Multitech card has no documentation (that I've been able to find) and apparently is designed for a "custom" ISA backplane.
ISA Breakout Board for Logic Analysers
Breakout board to simplify connecting an ISA card to a logic analyser.
Thus I thought it might be useful to have an ISA backplane with all of the signals broken out to pin headers.
This particular design only provides for +5VDC as that appears to be all that the Multitech CPU card requires - the -5V and ±12V pins are not connected.
I've also included a 2x31 pin header (2mm pin pitch) to connect to the ISA backplane designed for the Book 8088 computer so that additional cards, like video & storage, might be added.
ISA Breakout Card for Logic Analysers
Planning to design an ISA card with pin headers for connection to a logic analyser.
Parts
33| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | 100nF | Capacitor_THT:C_Disc_D3.0mm_W2.0mm_P2.50mm | C2, C3, C4, C5, C6, C7, C8, C9, C14, C15, C16, C17 |
| 6 | MountingHole | MountingHole:MountingHole_3.2mm_M3_DIN965 | H1, H2, H3, H4, H5, H6 |
| 2 | 100µF 25V | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C12, C13 |
| 1 | 10KΩ | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1 |
| 1 | 1KΩ (IORDY) | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3 |
| 1 | 4.7KΩ (~{IOCHK}) | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R4 |
| 1 | 470µF 16V | Capacitor_THT:CP_Radial_D10.0mm_P5.00mm | C1 |
| 1 | ATX-24 | Connector_Molex:Molex_Mini-Fit_Jr_5566-24A_2x12_P4.20mm_Vertical | J3 |
| 1 | ISA_Slot_1 | Clueless_Engineer:ISA_8bit_Slot | J4 |
| 1 | ISA_Slot_2 | Clueless_Engineer:ISA_8bit_Slot | J9 |
| 1 | ISA_Slot_3 | Clueless_Engineer:ISA_8bit_Slot | J10 |
| 1 | ISA_Slot_4 | Clueless_Engineer:ISA_8bit_Slot | J11 |
| 1 | ISA_Slot_5 | Clueless_Engineer:ISA_8bit_Slot | J12 |
| 1 | LED | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2 |
| 1 | POWER | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | SW1 |
| 1 | POWER | LED_THT:LED_D5.0mm | D1 |
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Questions
How big is the ISA Penta PCB?
It measures 155 × 100 mm and has 2 copper layers, 1.6 mm thick.
What parts does the ISA Penta use?
33 parts. 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 ISA Penta KiCad files?
From the BrettHallen/ISA_Breakout repository on GitHub, at the commit this page was made from: the board is ISA_Penta/ISA_Penta.kicad_pcb and its schematic ISA_8bit/ISA_8bit_Logic_Analyser_Breakout.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the ISA Penta design in my own project?
Its repository states no licence, so its author keeps all rights: ask BrettHallen before reusing the design.