2 Oct
2020
2 Oct
'20
12:52 a.m.
On Wed, Sep 30, 2020 at 7:48 PM Bob Rosenbloom via cctalk <
cctalk at classiccmp.org> wrote:
On 9/30/2020 3:40 PM, Josh Dersch via cctalk wrote:
Thanks, Bob! That does seem to be the same pinout, at least for the
power/ground. I think I've managed to convince myself of the correct
pinout for the power connector on this thing. I have a suitable supply and
connector on their way...
- Josh
On Wed, Sep 30, 2020 at 2:41 PM Gavin Scott via
cctalk <
cctalk at classiccmp.org> wrote:
is
Josh wrote:
Would these potentially be the
sense amp / comparators for the core? I
wonder if they were anything like:
https://datasheetspdf.com/pdf-file/1092342/Motorola/MC1711L/1
which might have a similar application and take +15 and -7 on L
package pins 11 and 4 respectively with ground on pin 12.
Being another Motorola design from what looks like a similar time
period, I wonder if there could be a similarity in pinouts by some
chance?
It's not an MC1711L based on that pinout. (But I suspect as you do that
it's part of the sense amp for the core). In particular Pin 1 of the IC connected to what I believe to be +15V.
(It's also hard to tell what
pin 1
is, since there's no orientation marker on
these... ) Ground is pin
10. I
suspect -15V is pin 7.
- Josh
That pinout sounds like the Motorola MC1440 sense amp though the
voltages are different.