> To anyone who has worked on the serial driver...

Well, I don't think I qualify, but...

> I need to change certain bits in one of the z8530's write registers,
> but the register contains other bits that I don't want to touch.  Is
> there an easy way of doing this?  The obvious solution is to have a
> variable somewhere that always mirrors the last value written to each
> write register (presumably an array of chars, one per register), but
> the driver doesn't seem to do that now.  Am I missing something?

Can't you just read back the register value?  Some bits might not have
identical meanings in read and write operations for a same register,
but I thought most of them could be read back...  Well, I may be wrong
as it was a loooooong time ago when I actually wrote a Z8530 driver
for OS-9/68k...

I'll dig up my Z8530 data sheet if you want (I think I still have it
somewhere).

Cheers,

ken n.