On Wed, Sep 30, 2020 at 7:48 PM Bob Rosenbloom via cctalk < cctalk@classiccmp.org> wrote:
> 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. > 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 > Bob > > -- > Vintage computers and electronics > www.dvq.com > www.tekmuseum.com > www.decmuseum.org > >
