General Stuff(tm)

[mrbombermillzy]

We need a 'HW horror stories' section of the forums for stuff like this.

I like the sound of that :)

Oh, don't worry, I've got plenty of candidates. More than you I expect, as you keep on fixing yours! :lol:

[rubber_jonnie]

I like the sound of that :)

Oh, don't worry, I've got plenty of candidates. More than you I expect, as you keep on fixing yours! :lol:

Then we definitely need one!!

:threadjacked:

[stephen_usher]

Actually, I just cut the power planes back...
IMG_2595.jpg
Other than complaining that the PoE power isn't working the Aruba core switch is now happy, so we can use the unit as an emergency replacement.

Wow, scorchio!!

I suppose no PoE is better than no switch, assuming you aren't using it for PoE devices.

Yeah, no PoE devices needed. I could rig up thick bodge wires if I wanted to.

[rubber_jonnie]

Wow, scorchio!!

I suppose no PoE is better than no switch, assuming you aren't using it for PoE devices.

Yeah, no PoE devices needed. I could rig up thick bodge wires if I wanted to.

That being said, I hope your leak is fixed!!

[stephen_usher]

Yeah, it only lasted for about 24 hours of full mains water pressure out of an open pipe a couple of floors above the machine room. The building is about 100m long and it had about 4cm of water over the whole floor.

[rubber_jonnie]

Yeah, it only lasted for about 24 hours of full mains water pressure out of an open pipe a couple of floors above the machine room. The building is about 100m long and it had about 4cm of water over the whole floor.

Yikes, that's a lot!!

[stephen_usher]

It looks like I'm going to have a little trip down the M40 and around the M25 on Saturday morning. I've got to go to Epping to collect the C64 breadbin as the auction house doesn't post things.

[stephen_usher]

I think I've made some progress with analysing the logic analyser output from the Sun 3/80 "DECODE 1" chip.

I exported the capture to a CSV file and then used Perl to determine which signals correlated to the output of the serial chip 2 write signal. This allowed me to quickly rule out a number of pins as they had no correlation at all.

Using this information I think I can determine that pin 3 is the bus W/R signal (high = write, low = read), the output of pin 19 correlates to serial port access and pin 42 (the ultimate pin, obviously) selects which serial port chip is being accessed. Well, those are my guesses anyway. I should be able to use a bread board and a GAL to generate the signals now. I'll first just use the logic analyser to see how these match the originals... or just connect them and see what happens. :-)

This will probably all have to wait until at least the weekend though.

[rubber_jonnie]

I think I've made some progress with analysing the logic analyser output from the Sun 3/80 "DECODE 1" chip.

I exported the capture to a CSV file and then used Perl to determine which signals correlated to the output of the serial chip 2 write signal. This allowed me to quickly rule out a number of pins as they had no correlation at all.

Using this information I think I can determine that pin 3 is the bus W/R signal (high = write, low = read), the output of pin 19 correlates to serial port access and pin 42 (the ultimate pin, obviously) selects which serial port chip is being accessed. Well, those are my guesses anyway. I should be able to use a bread board and a GAL to generate the signals now. I'll first just use the logic analyser to see how these match the originals... or just connect them and see what happens. :-)

This will probably all have to wait until at least the weekend though.

Good luck with the analysis, I know how you feel trying to decode the LA output on the 600XL, I suspect you are a little better at it than I.

[stephen_usher]

Being able to capture 16 channels at a time helped, as was the ability to export to CSV. Once I had the 1s & 0s in a parseable format Perl was the obvious choice.

For each entry where the serial chip 1 write line was active (active low) I either added 1 to a variable holding the value for another line if it was high or subtracted 1 if low. Then after doing this for every entry divided the counts by the number of entries. Any value which wasn't 1 or -1 I knew didn't fully correlate with the signal I was interested in. It also gave the sense (high or low) relative to the target signal.