11/45 progress

[Pete Turnbull]

On Mar 3 2005,  0:12, Jay West wrote:

> I'll have to figure out what address my console card is.

The console on all PDP-11s is at the same place, 777560-777566 (add
"17" in front for a 22-bit system, though).  The first word is the
receive control and status register (CSR), the next is the receive
buffer register, then the transmit CSR, and lastly the transmit buffer
register.  So if you have a terminal connected, and with baud rate,
parity, and word size to match the M7800 settings, simply DEPositing a
value into 777566 should cause the corresponding ASCII character to
appear on your terminal.  If you type a character on the terminal, it
should appear in the lowest 8 bits of 777562.

> However, if I have a unibus problem, isn't the M7800 which is in an
> SPC slot still going across the unibus?

Yes.  But trying it will tell you if the problem is in the CPU drivers
or the memory buffers, for example.

-- 
Pete						Peter Turnbull
						Network Manager
						University of York