Hi santafe, welcome to the forum !!
Since you have experience with different OSes, I don't think you will find OS/2, eCS or ArcaOS a challenge.
Let me tell you that we haven't hear from the eComStation owners in a few years now. So, I would not recommend buying eComStation today. ArcaOS is current and active.
Maybe, if you want to be conservative, it can be an good for you to try eComStation 2 (even that is not developed anymore) on VirtualBox as a guest, try to test the software you are looking for. You can install ANPM, update XWorkplace and install the software we have around (hobbes, netlabs, netlabs rpm, etc). Ask a little bit for help on these forums and try to improve the experience with the OS.
Later, once you are experienced, go for ArcaOS and real hardware. You may always ask for hardware recommendations here and/or check the machines that Blonde Guy (Neil) offers with ArcaOS (
https://blondeguy.com/ComputersForSale.html)
It is just my opinion, but you are always free to take the path you want
SOFTWAREAbout the software you are looking for, I can answer only this:
- Email (IMAP) - We have Thundebird.
- IRC (with the ability to connect to more than one server in the same time). - Qt4 Quassel
- Web browser (Firefox) - Firefox 45.9, but there is a project to get a newer browser like Falcon (qt5)
- Media player (vlc/mplayer/mpv) - VLC 3.0.8
- Ability to copy books to my FAT32 ebook reader - There are FAT32 drivers
- Telegram. - The web version of telegram seems to work on Firefox 45.9. (web.telegram.org)
- A relatively modern compiler toolchain to try to port the programs .... - I'm not complete sure which is the lastest gcc version we have.
HARDWAREAbout your hardware "Intel i5 3337U based ultrabook (Acer Aspire M5, UEFI with CSM)"
I recommend getting ArcaOS to go after real hardware, since it has ACPI and network updated drivers.
If you check your computer BIOS and you can set UEFI mode in Compatibility Support Module, I think it will install and boot.
I always like to ask people for their PCI.exe hardware report to check the deviceID of each device and be sure about which components do you have on you PC.
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WLan. I'm almost sure it will not work.
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Network (wired) will depend, but there a good shot with ArcaOS drivers.
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Audio: Realtek HDA sound chip... it had always been tricky for the me audio support. It would be better to try to test it out.
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Video: HD4000 GPU with 1 external screen -... uhm.. I'm not the best to answer this. Let's hope someone with more experience tells us more about it. Do you want an extended desktop? or to have the laptop lid closed?
Regards