Ok thanks for the heads up. I doubt I'm in a position to improve the design, and I already tried to match the ram chip, so, we'll see what we see when we see it I guess.
-- bkw On Sep 11, 2017 8:44 AM, "Stephen Adolph" <[email protected]> wrote: > Brian, you should be aware > > - the hardware has a flaw. the flops don't always power up in bank 0. > - REX software does not work reliably with Quad > - the quad utilities work ok though. > > yes 2 BAV70s > > > as far as the ram goes, I would just check it to make sure it is the > same as TC551001. you might find that ram for cheap on ebay. > > > OR - redo the design to address the flop issue and with a more > available ram chip / smaller footprint. > I do my designs for parts I have... > > steve > > > On Mon, Sep 11, 2017 at 12:27 AM, Brian White <[email protected]> wrote: > > Hey Steven, I think I worked up a DigiKey cart to build 3 QUADs, the > version > > on osh park now. > > > > 2 things I'm not sure about: > > > > The text on oshpark says it needs a BAV70, but it looks like there are > > footprints for 2 BAV70's on that version of the board. I assume I should > I > > install 2? > > > > The exact referenced memory chip is not available, but I think I > narrowed it > > down to about 20 possibles, and picked one for the cart based on > > availability as much as anything else. Does this part look right? I > tried to > > match, parallel, 18.4mm, 5v, forward pinout, > > > > The cart with the questionable memory chip is here: > > http://www.digikey.com/short/qcm427 > > > > Ignore the pins. The price is ridiculous, but I just wanted to make a > cart > > that had everything for reference and completeness, and I can't find any > > pins on DigiKey that aren't stupid like that. > > > > -- > > bkw >
