The Orange Pi 3 LTS hardware looks to be an interesting and available Single Board Computer (SBC). See http://www.orangepi.org/html/hardWare/computerAndMicrocontrollers/details/orange-pi-3-LTS.html for the hardware details.

[ i ordered from https://de.aliexpress.com/store/group/OPI-3-LTS-8GB-EMMC/1553371_30000000040035.html with a plastic case for 50 EUR - including delivery in April 2022 ]

Be aware, that following things are NOT working with Linux:

• Headphone Audio
• MIC recording
• TV-OUT
• Mali GPU
• Video codec

The info about that can be found - sort of hidden - in the User Manual in chapter 3.2 Linux4.9 kernel driver adaptation situation of the file OrangePi_3_LTS_H6_User manual_v1.0.pdf. I realized that, when starting setup of Linux.
Happily, none of these are necessary for the FMLIST-Scanner.

Wiring (ATX-buttons, LEDs or Piezo-buzzer) is tested meanwhile - but with not so good results:

Using https://github.com/orangepi-xunlong/wiringOP can set output pins, e.g. LEDs. This does work.

Ideally, this is done utilizing hardware PWM support - to save CPU interrupts. But i could not find any GPIO pin, capable of hardware PWM. Software/emulated PWM for the buzzer might work - haven't tested so far.

Sensing/reading GPIO input with internal pull-up/down resistors doesn't work with the WiringOP library. This, ATX-button won't give correct state - without external resistors. See https://kalitut.com/raspberrypi-gpio-pull-up-pull-down-resistor/, how external resistor would need to be wired. I didn't try for now.

Upload of result - by pressing the button - won't work.
But, shutdown and reboot can be performed with the builtin power switch.

Happily, at least for static (non-mobile) use, you won't need any of LEDs, buzzer or ATX-knobs.
Buzzer and LEDs are nice to see/hear some progress, but you can go mobile without .. and check progress through an internet connection over phone/tablet and WiFi.

I would recommend some heatsinks for the CPU - as temperature does temporarily rise over 80°C.
Ideally, i'd also suggest a CPU fan, but couldn't find a suitable housing.

Orange Pi does provide an Ubuntu Image for the Orange Pi 3 LTS , labeled updated: 2021-12-27 at http://www.orangepi.org/downloadresources/.

There is also a Debian Image ; but i did only try the Ubuntu one.

Following the Ubuntu download link to Google Drive, choose
Orangepi3-lts_2.1.6_ubuntu_focal_server_linux5.10.75.7z
(as i did), cause the scanner doesn't need a desktop.

Please follow the instructions in chapter 2 Instructions to use the development board of the user manual to write the image to a micro-SD card.

You should be able to boot and login with one of following user accounts as described in the user manual

i strongly recommend to change the default passwords!

Default hostname is orangepi3-lts.

You should be able to connect with

ssh orangepi@orangepi3-lts

Follow the user manual chapter 3.33 to flash the image to the builtin eMMC, to allow using the micro-SD card slot for writing scanner results. That is with the command

nand-sata-install

I would recommend to select f2fs, the flash friendly filesystem, as target filesystem.

When finished, you should be able to boot without inserted micro-SD card.

Please continue with 2.2 Setup on a pre-installed Pi or PC