Adwater & Stir

If the firmware is loaded on an Arduino Due and run without any front panel hardware connected, the emulator will automatically detect this and force RUN mode.

Version 1.0.3 and later have a location to add an ESP-01s: This can be used to communicate with the Altair-Duino 680 via Telnet over a Wi-Fi connection.

The Altair 680 did not recognize the backspace key as we use it today.

VTL-2: To load VTL-2 (Very Tiny Language), first make sure the VTL-2 ROM is installed (using Startup Options), then make sure your emulator is switched to RUN mode.

You can change the startup options using the address toggles and holding RESET DOWN while starting the emulator.

The Altair 680 front panel functions much like the original microcomputer, allowing you to directly interact with memory and control program execution.

Operating Your Altair 680 Now that your Altair 680 emulator is fully assembled, this section will guide you through powering it on, connecting to a terminal, and loading BASIC just like the original 1976 MITS Altair 680.

While I was working on my Altair 680 emulator, something strange started happening.

If you are running the original Altair 680 Editor/Assembler on the Altair-Duino 680 emulator with more than 48k of RAM you may encounter the following behavior: Assembly of even very small programs that contain symbols (labels) fails with ERROR 017 Progra…

The Altair-Duino 680 emulator does not run at full, cycle-accurate speed compared to an original 1977 MITS Altair 680 system.