Hello,
On a French keyboard, the '/' can be obtained by shifting the ':/' key (scancode 0x34), or using the '/' keypad key which is the extended '0xe0+0x35'. However, calling the 0x16 interrupt while pressing the keypad '/' does not return an extended key: it returns 0x35 which maps to '!ยง'. This means it is impossible to implement a correct key mapping for both '/' keys, and '!'.
It seems to me that the problem is due to the following test in the __processkey() function (kbd.c, seabios 0.5.1 and git repository):
if (flags2 & KF2_LAST_E0 && scancode >= 0x47 && scancode <= 0x53) { /* extended keys handling */ ... }
which disregards the case scancode = 0x35. Changing the 0x47 boundary value fixes the problem. Could somebody validate this micro patch?