Here be dragons: This emulator overclocks the Fruit Jam's RP2350 to 378MHz, which is outside of the range officially supported by the chip. We have not seen any problems arise from this with short term usage, but there is always a risk to the hardware when operating outside of spec.
Prepare DOS Floppy .img File
By default the emulator won't do anything without a bootable floppy disk image to load. This page will document how to load a DOS floppy into slot 1. See the Usage page for details on loading other software.
First download the DOS floppy disk dos6-fdd0.img file by clicking the button below.
Create a folder named XT at the root of a blank FAT formatted SD CardĀ such as the ones we stock.
Inside of the XT folder paste the DOS disk image file downloaded from the button above.
Rename it to fdd0.img
Use the eject, unmount, or safely remove action in your OS to disconnect the microSD drive from the host OS, then unplug the microSD card from the computer.
Power off your Fruit Jam and insert the microSD card into the Fruit Jam's microSD card slot.
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Install Emulator UF2
The FruitJam-286 Emulator is released as a UF2 file that is ready for loading onto the Adafruit Fruit Jam. Click the button below to download the latest release of the emulator.
Plug your Fruit Jam into your computer with a known good USB (data+power) cable.
To enter the bootloader, hold down theĀ BOOT/BOOTSEL button (highlighted in red above), and while continuing to hold it (don't let go!), press and release the reset button (highlighted in blue above).Ā Continue to hold the BOOT/BOOTSEL button until the RP2350 drive appears on your Computer (in Finder or File Explorer depending on your operating system)!
If the drive does not appear, release all the buttons, and then repeat the process above.
You can also start with your board unplugged from USB, press and hold the BOOTSEL button (highlighted in red above), continue to hold it while plugging it into USB, and wait for the drive to appear before releasing the button.
A lot of people end up using charge-only USB cables and it is very frustrating! Make sure you have a USB cable you know is good for data sync.
You will see a new disk drive appear called RP2350.
Drag the fruitjam-286-378MHz-HDMI-I2S-ONBOARD_PSRAM_PIN_47.uf2 file downloaded from the green button above to theĀ RP2350 drive.
After the file copy is complete, the Fruit Jam will reset and begin running the 286 emulator, and boot to the DOS disk.
With a DVI compatible display connected, it will show the boot sequence below.
If there are speakers or headphones connected to the 3.5mm audio jack, a beep sound will play during the boot sequence.
Page last edited October 31, 2025
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