On 9/30/2020 3:40 PM, Josh Dersch via cctalk wrote:
On Wed, Sep 30, 2020 at 2:41 PM Gavin Scott via cctalk <
cctalk@classiccmp.org> wrote:
Josh wrote:
https://1drv.ms/u/s!Aqb36sqnCIfMpIVXm5draSrWHGMzJg
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 is
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.
Bob
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