A-ONE I/O Interface Board
8-bit input / output expansion for the A-ONE Apple-1 replica
Expand your A-ONE system with real hardware interaction.
The A-ONE I/O Interface Board is a practical 8-bit input and output expansion card
designed for the A-ONE Apple-1 replica platform.
It allows users to directly read digital inputs and control external outputs
from BASIC or machine code.
Visual and intuitive hardware control
The board features a clear and practical layout with:
- 8 red LED indicators for output monitoring
- 8-position DIP switch input bank
- selectable I/O addresses via jumpers
- direct A-ONE bus connection
Perfect for retro-computing experiments, education, and hardware prototyping.
How it works
The A-ONE I/O board uses
memory-mapped I/O, just like classic 1970s computer hardware.
The DIP switch provides an 8-bit binary input value, while the LED row shows the output byte
written by the computer in real time.
Operation (BASIC Example)
Write output value:
A = 128
POKE -24576, A
Read switch input:
B = PEEK(-24576)
PRINT B
Ideal for learning binary logic, low-level programming and hardware interfacing.
Features
- Fully compatible with A-ONE Apple-1 replica boards or systems
- 8-bit input and output interface
- 8 LED output indicators
- 8-position DIP switch input bank
- Selectable I/O addresses
- Direct edge-connector design
- Designed and manufactured in the Netherlands
A-ONE is a modern replica system inspired by the 1976 Apple-1 computer.
This product is not an original Apple product and is not affiliated with or endorsed by Apple Inc.
Apple-1 is a historical reference used for compatibility and educational purposes only.