Re: Digital circuits and analog devices

2016-12-02 Thread Guy Dawson
There's a Sophie Wilson talking head exhibit at the Science Museum in London where she says the prototype ARM chip worked well but when they went to measure it power it used they discovered that the power pin was not connected. The ARM CPU was running on current leaking from the chips it was

Re: Digital circuits and analog devices

2016-12-02 Thread Mouse
>> I think the original is 'Digital circuits are made from analog >> parts' >> Another of the laws is 'There is no such thing as ground' This reminds me of an incident of my own which is one of my favourite examples of why learning about things at every level possible is useful. I built a PROM

Re: Digital circuits and analog devices

2016-12-02 Thread Chuck Guzis
Just about anyone who's ever worked in ECL (non-saturating logic) is aware of this and doesn't need to be reminded by anyone. The same for anyone implementing logic using vacuum tubes. In fact, the other aspect of digital logic is that it's a study of transmission lines--and that's often voiced.

Re: Digital circuits and analog devices

2016-12-02 Thread Tony Duell
On Fri, Dec 2, 2016 at 1:33 PM, Noel Chiappa wrote: > > A related one ... came from Professor M. V. Wilkes > > That one I _did_ remember (although I couldn't remember if it was Wilkes or > Wheeler - I knew it was one of those Cambridge guys :-), but it's not quite >

Re: Digital circuits and analog devices

2016-12-02 Thread Tony Duell
On Fri, Dec 2, 2016 at 3:57 PM, Paul Koning wrote: > > On the bit about grounds, I still have tucked away somewhere a very funny > (but also serious) memory by Bob Steward (lead designer of a number of VAXen) > entitled "Do not cut your grounds". He described how a

Re: Digital circuits and analog devices

2016-12-02 Thread Toby Thain
On 2016-12-02 10:57 AM, Paul Koning wrote: ... A somewhat related area is the many different ways in which a number of chip designers messed up the random number generators needed in half duplex Ethernet. I remember Intel as a particular offender, but probably not the only one. AMD got it right

Re: Digital circuits and analog devices

2016-12-02 Thread Paul Koning
> On Dec 2, 2016, at 12:59 AM, Tony Duell wrote: > > On Fri, Dec 2, 2016 at 2:31 AM, Noel Chiappa wrote: >> So I have this memory of a set of law promulgated by an engineer at DEC, one >> of which was something to the effect that 'all digital

Re: Digital circuits and analog devices

2016-12-02 Thread Liam Proven
On 2 December 2016 at 15:11, Noel Chiappa wrote: > Since you'd done all the hard work (typing them in), I uploaded them (less > typos :-), to: > > http://gunkies.org/wiki/Vonada's_Engineering_Maxims > > Interestingly, there's a typo in the originall: "worse-case". :-)

Re: Digital circuits and analog devices

2016-12-02 Thread Noel Chiappa
> From: Eric Smith > The full set from the book (any typos are mine) Since you'd done all the hard work (typing them in), I uploaded them (less typos :-), to: http://gunkies.org/wiki/Vonada's_Engineering_Maxims Interestingly, there's a typo in the originall: "worse-case". :-)

Re: Digital circuits and analog devices

2016-12-02 Thread Noel Chiappa
> From: Tony Duell > It's one of Don Vonada's laws. Ah, thank you, thank you, that's the one I was looking for! I knew _you_'d know it! :-) > A related one ... came from Professor M. V. Wilkes That one I _did_ remember (although I couldn't remember if it was Wilkes or Wheeler - I

Re: Digital circuits and analog devices

2016-12-01 Thread Eric Smith
On Thu, Dec 1, 2016 at 10:59 PM, Tony Duell wrote: > It's one of Don Vonada's laws. I am pretty sure I first read them in > 'Computer Engineering', that book produced by DEC. I think the > original is 'Digital circuits are made from analog parts' > > Another of the laws is

Re: Digital circuits and analog devices

2016-12-01 Thread Tony Duell
On Fri, Dec 2, 2016 at 2:31 AM, Noel Chiappa wrote: > So I have this memory of a set of law promulgated by an engineer at DEC, one > of which was something to the effect that 'all digital circuits are made out > of analog devices'. However, my memory doesn't recall where

Re: Digital circuits and analog devices

2016-12-01 Thread Chuck Guzis
On 12/01/2016 06:31 PM, Noel Chiappa wrote: > So I have this memory of a set of law promulgated by an engineer at > DEC, one of which was something to the effect that 'all digital > circuits are made out of analog devices'. However, my memory doesn't > recall where I saw this, and my Google-fu is

Re: Digital circuits and analog devices

2016-12-01 Thread drlegendre .
g > Cc: j...@mercury.lcs.mit.edu > Subject: Digital circuits and analog devices > > So I have this memory of a set of law promulgated by an engineer at DEC, > one of which was something to the effect that 'all digital circuits are > made out of analog devices'. However, my memory doesn

RE: Digital circuits and analog devices

2016-12-01 Thread W2HX
Message- From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Noel Chiappa Sent: Thursday, December 01, 2016 9:31 PM To: cctalk@classiccmp.org Cc: j...@mercury.lcs.mit.edu Subject: Digital circuits and analog devices So I have this memory of a set of law promulgated by an engineer

Digital circuits and analog devices

2016-12-01 Thread Noel Chiappa
So I have this memory of a set of law promulgated by an engineer at DEC, one of which was something to the effect that 'all digital circuits are made out of analog devices'. However, my memory doesn't recall where I saw this, and my Google-fu is not strong enough to turn it up. Can anyone help?