16 Feb
2015
16 Feb
'15
3:39 a.m.
Regarding cable coloring, the fact remains that the M8159 Data Buffer has a
J5 Berg connector down over tabs E/F, whereas both the M8158 & M8159 have
their J1/2/3/4 data/address Berg connectors up over tabs A/B/C. I'd say
that the color-differences happen to be significant in this case, but only
because they happen to align with the location of J5 :->. Agree that
what's happening, color-wise, over the upper-tabs doesn't _seem_ to be
significant.
Since you've raised the topic of the Box Controllers, I see 16 (or 8
top-over-bottom pairs). Isn't that enough for 4 MK11 (or MKA11)?
Note that 1170mP_Jul77_text.pdf also includes some additional MKA11
information, and improved diagrams. Interesting comments regarding initial
consideration of developing a MP based on the 11/34.
On Mon, Feb 16, 2015 at 3:27 AM, Eric Smith <spacewar at gmail.com> wrote:
On Mon, Feb 16, 2015 at 1:05 AM, Paul Birkel
<pbirkel at gmail.com> wrote:
Notice the two unused connectors on the M8162
there in the middle slot
(#15).
As this looks like an operational configuration, I infer that those two
connectors are used for ... nothing? Test points (through series
resistors)?
I see (how can one miss!) the address and data ribbon-cables. The
remaining white ribbon-cables must be for the box controllers. So, that
looks like a 1Mw configuration. Maybe 1.5Mw if, as you suggest, you're
careful?
It appears to me that the off-white or light-grey cables are address
and data cables, just as the grey ones, and the color was simply what
was available at the time, or from a different cable vendor. The other
boxes show different mixes of shades of gray for their cables.
I believe that the molex connectors on the card in slot 15 are for the
control box, and were either removed for the photograph, or were not
necessary for the operation of the machine. Note that CPU A and B do
not have fully populated memory control panels, which suggests that
the memory control panel wasn't strictly necessary for machine
operation, though obviously very desirable for diagnostic purposes. I
don't really know, but if I'd designed the MKA11, I would have
designed it so that without the controller connected, all ports are
enabled.