IO Support Header Values
Posted: Wed Jan 10, 2018 8:03 am
I was wondering what values were legal for the IO support field in the standard Sega ROM header so I poked around a bit. This page from the official docs gives quite a few of them, but omits newer peripherals. Looking at the games in my collection I was able to fill in a few gaps and come up with the following list
Menacer games don't appear to have anything other than J in the IO support field (at least the ones I own do not anyway).
- J = 3-button gamepad
- O = 2-button SMS/Mark III pad
- 6 = 6-button gamepad
- 4 = Sega Team Player (Note games that only support the EA 4-Way Play tap don't seem to indicate that in this header at all)
- K = 10 Key Pad
- R = RS-232C device (basically the modem)
- P = Printer
- T = Tablet (unreleased)
- M = Mouse
- B = Trackball (essentially an alias for the mouse, Nobunaga's Ambition uses this)
- V = Paddle Controller (unsure if this is the Mark III paddle controller or an unreleased MD peripheral)
- F = Floppy Drive (unreleased)
- C = CD-ROM Drive (i.e. Mega CD)
- A = XE-1AP
- L = Activator
Menacer games don't appear to have anything other than J in the IO support field (at least the ones I own do not anyway).