>included below is the patch to sys/arch/sparc/dev/zs.c
>to add the TIOCSBRK and TIOCCBRK ioclt's ..

They look OK (modulo the state of the rest of the driver, i.e., `yuck'
[says the author of the rest of the driver :-) ]), except for one thing.
As the original code says:

	case TIOCSBRK:
		/* FINISH ME ... need implicit TIOCCBRK in zsclose as well */

you need to clear any ongoing break condition in zsclose().

Chris

------------------------------------------------------------------------------