Whoops, sent too soon.. Could someone also clarify what is meant by "gates" in this sense? Are we talking about the gates (G) of a FET, as in Gate, Drain and Source - or are we referring to the composite logic gates (NAND, etc.), built up of multiple bipolar - or MOS - transistors?
On Sat, May 28, 2016 at 8:19 PM, drlegendre . <drlegen...@gmail.com> wrote: > @Eric, All, > > Light a candle for those in the dark.. > > If the min. clock speed is dictated by the ability of the gates to hold a > charge, as the bits rot away as charge drains (someone said "minimize > resistance to ground", but I believe they meant "maximize"?) , then what is > limiting the max. clock speed? > > Is it just basic PCB stuff, like trace inductance, mutual / parasitic > capacitance, etc? Or are there other, more critical factors? I can't > imagine propagation delays could matter at these slow speeds.. requiring > meandering of traces and so forth. > > On Sat, May 28, 2016 at 2:55 PM, Corey Cohen <appleco...@optonline.net> > wrote: > >> >> > On May 28, 2016, at 1:31 PM, Eric Smith <space...@gmail.com> wrote: >> > >> >> On Sat, May 28, 2016 at 5:31 AM, Corey Cohen <appleco...@optonline.net> >> wrote: >> >> I can't wait to buy one!!! I have a spare Replica-1 just waiting to >> hook up to a Monster 6502. >> > >> > It doesn't run at full speed. It presently runs in the tens to low >> > hundreds of kHz. If a Replica-1 can be run slower than normal, that >> > might work. Other common 6502-based micros, such as the Apple II or >> > Atari 400/800 will not work at low speed due to inherent timing >> > requirements related to video generation and DRAM refresh. >> > >> >> Just need to wire up a single step switch and this thing will be >> awesome!!! >> > >> > If you wire single-stepping using the RDY line, that should work, >> > though it will only single-step read cycles, not write cycles. >> > >> > You can't single-step the actual clock because it is dynamic logic. >> >> The replica-1 uses a propellor chip for video and static ram so I don't >> think it's that critical to timing. >> > >
