While this core technically supports loading ROMs from the top level of the BIOS folder, this causes a conflict with MSX emulation also requiring a file named “disk.rom” there, so you should create a
quasi88 subfolder inside
/roms/bios and put them there instead.
There is a “pseudo BIOS” if you do not provide these files, but there is a 99% chance that it won’t work.
The controller defaults to the “Retro Joypad” device, which defaults to the numerical pad + Z & X layout. You can also map the I, space, and enter keys for games that deviate from it slightly.
For the many games that use other control systems, you’ll need to either switch to the “Retro Keyboard” and build your own layout from scratch, or plug in a USB keyboard and use that.
To use the Retro Keyboard layout, enter the RA Quick Menu, select
Controls and then
Port 1 Controls, and change
Device Type to
Retro Keyboard. Controls for the PC88 were highly game dependent, so you’ll need to either find a guide to the controls for the game in question or do a lot of experimenting.
There are some adventure games on the system that use text input and require you to type full words. Since there’s no onscreen keyboard for quasi88 at the moment, the only reasonable way to play these games is with a USB keyboard.
If you see a screen saying “how many files?” this is fine, wait for a bit, as the disk should soon autoboot.
Some games (such as Donkey Kong 3: Dai Gyakushuu) may need “BASIC mode” in the core options set to “N88 V1H” otherwise the colours will be all wrong.