Last night I did a little more poking. First, I looked at all the data lines at the cpu on a good M100, and verified that on a good M100, all of those pins show continuous streams of data while the machine is on.
Then on the bad M100 I saw 2 differences from the good M100. 1) I can't get a stable trigger lock on any of the A* & AD* pins on the good M100. IE, On the good machine the data doesn't repeat exactly around 53ms like it does on most pins on the bad M100. 2) 4 pins are stuck high: A10, A12, A13, A14 Screenshots of pins AD0-AD7 & A8-A16 https://photos.app.goo.gl/vcTg4yUhvjXKBxeh1 I thought those ramps and 2-volt sawtooths on the AD0-AD7 lines looked bad, but the good machine has the same thing. -- bkw On Fri, Dec 15, 2017 at 7:52 AM, <[email protected]> wrote: > I have a really basic one like this, based on the Cypress CY7C68013A > https://sigrok.org/wiki/Lcsoft_Mini_Board > > I like to use it with the saleae software, but to have 16ch instead of 8 I > use Sigrok. > > Mauro > > > > Il 15.12.2017 12:56 Brian White ha scritto: > > On Dec 15, 2017 6:16 AM, <[email protected]> wrote: > >> >> BTW: Brian do you have a LA so we can compare the same signals on the ROM >> and RAM addressing/enabling on the working and not working >> > Sorry I am looking at them but hadn't picked one yet. > -- > bkw > > > > > Con Mobile Open 7 GB a 9 euro/4 sett navighi veloce con 7 GB di Internet e > hai 200 minuti ed SMS a 12 cent. Passa a Tiscali Mobile! > http://tisca.li/OPEN7GBFirma > >
