I have the same thing here locally. ;o; I don't know where you're getting the 8000hz beeper from, copied from the other source code? Be mindful of the original copyright holder and GPL2 license. It's a 1bit dac, directly controlled with d0.
Well I tend to use 8000hz as a default as it's a common value in sound systems (this is also what the Monon DAC timer is hardcoded to right now for example) and assumed it was a beeper rather than proper DAC
I don't mind which driver you use, I knocked it together in about half an hour, I thought it was kinda obvious I was going to look at it when I said it was simple and made the comment about the rom loading (4 program ROMs is correct, 1 combined one is not)
Alright, well, change it to 1bit DAC. "マイコン麻雀" is "Micom Mahjong" (transliterate, don't translate) - probably change filename too, which in your PR has an error (mame.lst and filename itself don't match)
And the 16 in your gfxdecode means 16 colors? It has 1.
Astro Thunder/Firefox: Years ago, Kevtris tried to dump it but couldn't figure it out. It's a uCOM-75(unemulated), and also a 2nd MCU for sound.
Thanks hap for the info, so until someone finds the proper information to emulate the chip, it's "on hold"....just curious, how many VFD games are dumped but can't be emulated due to missing information ?