15 Jun
2016
15 Jun
'16
12:48 p.m.
On Wed, Jun 15, 2016 at 3:16 PM, Noel Chiappa <jnc at mercury.lcs.mit.edu>
wrote:
Thanks, done. Just about to try it out.
OK, this makes sense, thanks.
Many would appreciate this I bet.
Maybe just keep it to the useful combos :-)
Thanks again.
b
From: William
Degnan
> For 777560/60 (standard for the console), you
want A7/A3 and V4/V5
> 'in'.
I intend to use a serial terminal to access the
console via M912
CONSOLE ROM.
Got it; that would mean you're wanting the standard console.
I believe you're saying to connect A7/A3 and
V4/V5
Right, insert jumpers A7 and A3, and also V5 and V4.
I still don't understand the pattern.
They specify the device address and vector in binary.
A7 is the 7th bit of the address, i.e. the 0200 bit. And since the DL11 is
'address jumper in for 0', that bit in the device's address is going to be
_0_ when the jumper is in. That would turn 777770 (remember, the device is
a
block of 8 bytes, from xxxxx0 to xxxxx7, so you can't set the low 3 bits in
the base address, they must be 0) into 777570. Similarly, A3 is 010, and
turns 777770 to 777760. Put them together, you get 777560.
V5 = 040, V4 = 020, so they become a vector of 060.
What would A4, A5, A6 and V7, V6, V3 represent
A4 = 020, A5 = 040, A6 = 0100. V7 = 0200, V6 = 100, V3 = 010.
Is there a
table with the jumpers and values somewhere?
No, but I'll whip one up and stick it on the Computer History wiki.
Specifically
something that lists all jumper combos and their
corresponding addresses?
Well, _all_ the combinations would be 2^8 combinations (there are 8 address
jumpers), which is pretty sizeable, and I don't feel like listing them all,
but I can list a couple of the most common ones (e.g. console, second line,
etc).