The 500k + 1uF looks like part of a power-on reset to reset the 74AC74 to point to bank 0, perhaps???
On Jun 16, 2016, at 4:29 PM, Stephen Adolph <[email protected]> wrote: > I will post a parts list later. > Pins should be round machine pins. you can get round machine pin > headers on ebay for .10-.20 cents per pin. Logic parts look right. > there are variants that also work, TC551001 BFTL for example. no > need for low leakage but it's better of course. > > the time constant has to be big. I think I use 500kohm and 1uF. > > On Thu, Jun 16, 2016 at 4:14 PM, Atsushi Takahashi <[email protected]> > wrote: >> Dear Steve, >> >> I’m excited that you released the QUAD PC board! I’m a new Model 100 owner >> with a long history going back to the S-100 bus days. Most of the components >> on the board are in the photo on the QUAD web page but I was wondering what >> capacitors and resistor values are needed: 0.1uF bypass caps? 10k pull-up? >> >> This looks like the rest: >> 74AC02 (Quad 2 input NOR gate) >> 74AC74 (dual flip flop) >> 74AC573 (8 bit latch) >> TC551001AFTL-10L (memory) >> BAV70 (pair of diodes) >> >> Will the machined pins someone posted a few weeks ago work? >> http://www.king-cart.com/phoenixent/product_name=HWS5231 >> >> If I successfully build one, I’ll write up instructions so you can post them >> on your site (if you want)... >> >> Atsushi >> >> >> >> >> On Jun 16, 2016, at 3:18 PM, Brian White <[email protected]> wrote: >> >> What, the rex 4 boards? Don't worry about that. Unless you actually want >> them for something? I'll mail them to you just a favor if you have some use >> for them, but I don't care about the $6. >> >> I don't have them yet. Probably another week. >> >> -- >> bkw >> >> On Jun 16, 2016 12:29 PM, "Stephen Adolph" <[email protected]> wrote: >>> >>> I can buy those from you. >>> >>> On Thu, Jun 16, 2016 at 12:29 PM, Stephen Adolph <[email protected]> >>> wrote: >>>> sorry... >>>> >>>> On Thu, Jun 16, 2016 at 12:26 PM, Brian White <[email protected]> >>>> wrote: >>>>> Thanks for the heads up. I hadn't bought any other parts yet and the >>>>> boards >>>>> themselves are only $6 for 3. No big. >>>>> >>>>> -- >>>>> bkw >> >>
