It's a SNROM version of VegaPlay. With a 256KB flash you can load 7 non-banking NSFs <32K (you lose the vector table and trampoline bytes from each 32K 'slot'. One 32K 'slot' is used for reset code and CHR data that's banked out after reset.).
The runtime is loaded into WRAM during reset, leaving the PRG space for NSFs.
I've tried to simplify the loading and compiling process, you don't need to strip the header from the NSFs and there is a User Configure file to do all the editing in, so the main ASM file can be left alone.
Just drop all your NSFs into the build folder, edit User Configure with the NSF titles and load addresses and run the compile bat. It will spit out a .NES and/or a .PRG ready to flash.
With a compiler switch you can use the normal playback timing based on the NMI or use Sync pulses on controller 2 (this is based on FamiSlayer v6.66 by Heavyw8bit). I'm working on a cheap (16F628 based) Midi Clock to NES Sync24 converter. Testing a proto board, so both the HW and the NES rom could change as things progress.
These preview ROMs are NSFs from the FamiMiniCompo10, the User Configure.asm has the title info.
The Pad1 controls:
Up/Down - song # (all these are single song NSFs so trying to run a song other than the first will crash it)
Left/Right - cycle thru the 7 NSFs
Start Button - Start/Stop playback
Added a preview rom with a fixed Read routines. No more strange behavior, at least from the NES
https://www.dropbox.com/sh/g6osy6uozook ... -yjh_7WJUa