I have a later model 1601 Genesis (one of the ones that didn't have the EXT port installed) and it shows the "licensed by Sega" startup screen.
So apparently some model 1 units have the TMSS stuff.
EDIT: I've just checked and my 1601 returns $A10001 = $A1
I don't have an older 1601 handy right now, other than a dead unit.
Detecting the bios
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