daver2
10k Member
The signals on the oscilloscope aren't locked to anything and are constantly 'moving'.Hi Dave, what sign doesn't convince you?
Dave
The signals on the oscilloscope aren't locked to anything and are constantly 'moving'.Hi Dave, what sign doesn't convince you?
Maybe my scope it isn't enough for these testsThe signals on the oscilloscope aren't locked to anything and are constantly 'moving'.
Dave
A simpler approach is to simply use CH2. Put the CH2 probe on BA15. Adjust the timebase to one cycle of BA15 fits. Move the Trigger to CH2 and use the -ve edge mode, then adjust the trigger level until everything stops moving.I would use the external X trigger with a separate probe monitoring BA15 and triggered on a HIGH to LOW transition.
Sorry but i don't understand ((((A simpler approach is to simply use CH2. Put the CH2 probe on BA15. Adjust the timebase to one cycle of BA15 fits. Move the Trigger to CH2 and use the -ve edge mode, then adjust the trigger level until everything stops moving.
IMHO Two channels is enough for all this.
All the probing for the decode circuitry is so much more obvious, whilst NOPing, when it is compared to a single cycle of (B)A15
Ba15 on cpu ord ud2??A simpler approach is to simply use CH2. Put the CH2 probe on BA15
It doesn't matter.Ba15 on cpu ord ud2??
Why need i use CH2? It's different from Ch1??
but probe on ch2 must be fixed on the pin of the ic?
Yes. You need to find a convenient way to set that up.... I often solder a 'flying wire' to that pin and then connect it to the CH2 probe. Makes it secure and one less thing to worry about whilst moving around the other probe.
Set the TRIGGER to CH2 (slide switch on right)This is best setting to see BA15 on ch2
Zoom out slightly (i.e. change timebase) so you see a full cycle (and a bit), then move it down to the bottom half of the display and then get working on adding CH1 (and move the CH1 trace into the top half). We are aiming for two traces... one in the top half and one in the bottom.Ok, can be good now?
Nivag,PS
I am unavailable for a few days now... hope to see some progress on my return!