it is an attempt to do so. I don't think it works too well. There seems to be a small probability that it comes up in a non zero state, which I never got to the bottom of.
On Thu, Jun 16, 2016 at 4:39 PM, Atsushi Takahashi <[email protected]> wrote: > 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 >>> >>> >
