That looks great. I just wanted some travel laptop for old games. I think it does not have a power to run Quake 2 on 640x480, only 320x240 😁 and no OpenGL. But the rest looks good. I got it here for 100 Eur including floppy + cd-rom + docking station + bag: https://www.ebay.com/itm/143656153872 ...I was lucky. Shipping from Germany to Czechia was around 15 Eur. These Scenic Mobile units are still not that expensive like Compaq LTE or older Siemens Nixdorf PCD-5ND and PCD-4ND. I see it has ES1878, did not know it as also ES690F.
I'm starting to learn how to fix laptops 😀. I need to fix display on Siemens Nixdorf 510 (you can get these for 15-20 Eur on E-Bay, but mostly need to fix something).
The next step for this 710 is to open battery case and buy a new Li-on battery cell, then put it inside and voila! It should stay alive at least for 2-3 hours.
I tried Stunts game and the scaling seems to be ok. I don't have any black border (using vexp.com m1 command), but you can see the scaling is not proportional.
Do you have some example of your music, what can be created? I started with FruityLoops ten years ago and nowadays I'm more of Ableton + Reason guy. You could also use the gameport and connect something like Roland SC-55, right? I use it for retrogaming 😀