12 Jan
2003
12 Jan
'03
10:06 a.m.
Ethan Dicks wrote:
--- Michael Davidson
<michael_davidson(a)pacbell.net> wrote:
Since it's a 4 port serial card with each channel having both a TX
and RX interrupt associted with it, and the DC003 is the chip that
handles the interrupt request / acknowledge protocol for 2 interrupts
you actually *would* expect that there would be 4 x DC003 *and* 4 x DC005.
I just found my one "real" DEC DLV11J and it does, in fact have
4 x DC003, but only 3 x DC005.
My guess is that since the DLV11J occupies an unusually large range
of addresses they didn't need the address decoding capabilities
that a full set of 4 x DC005 would have provided and they substituted
a cheaper set of bus drivers / receivers for the 4th DC005.
Michael Davidson
If memory serves, a DLV11J 4 port async serial
interface would be
a good place to look since they are not particularly hard to find
and I *think* (sorry, I don't have one I can look at right now)
they have 4 DC003 chips on them.
Probably not 4 x DC003. Probably 4 x DC005. Probably 1 x DC003.