limitations - cayce-msx/msxpp-quick-ref GitHub Wiki

MSX++ emulates an MSX2+ that mostly resembles the FS-A1WSX. You might miss a few features when comparing with that device.

• Centronics printer port
• RenShaTurbo autofire - is present on SM-X/SX-2
• A1 firmware, hardware switch & _MENU command - Cockpit, Word Processor & MSX-JE
• 16 or 32KiB SRAM - might only be used by A1 firmware?
• RTC and other settings saved to CMOS - see RTCSAVE.COM for an alternative

And for Turbo-R:

• MIDI in/out
  • port 0xE8 MIDI out is implemented, and outputs to joystick port2
  • but the support is too limited to enable Turbo-R MSX-MIDI.
• microphone
• R800 LED / indicator
• Turbo-R PCM works, but does not run at R800 frequency

Listing all special features the one has, but not the other.

** = SM-X/SX-2 does have it
*** = SM-X/SX-2 has it partially ! = cannot be added to an MSX++ device by inserting a cartridge - although you would need ~5 cartridges... (!) = technically possible to add as cartridge, but not available on the market

SX1 with MSX2+ firmware & BIOS	Boosted_MSX2+
Physical device!	RenShaTurbo **
1MiB VRAM	192KiB VRAM !
4(+2/4) MiB RAM Mapper	Second PSG **
MicroSD Card with (Nextor) DOS2	Floppy disk drive
RTC saved to SD-BIOS	RTC saved to CMOS (!)
9 status LEDs ***	V9990 / Video9000
8 dip switches	MSX-AUDIO ***
Pause, execute and cancel keys	MoonSound OPL4 ***
Volume per audio device	Matsushita device !
TurboR PCM out	A1 firmware incl. SRAM !
Wi-Fi	Printer port (!)
MSX-MIDI out	MusicModuleMIDI