Search found 222 matches

by Smonson
Mon Dec 31, 2018 10:42 pm
Forum: HARDWARE DISCUSSIONS
Topic: Project: HDMI/DVI out for STFM
Replies: 435
Views: 29309

Re: Project: HDMI/DVI out for STFM

This is kind of on hold at the moment - I need to get my hands on one of these machines with the resetting behavior.
by Smonson
Sat Dec 08, 2018 9:31 am
Forum: HARDWARE DISCUSSIONS
Topic: Project: HDMI/DVI out for STFM
Replies: 435
Views: 29309

Re: Project: HDMI/DVI out for STFM

As a mad idea, could you double the length of your ribbon cable on your board and try tests again ? Make sure PSU is at 5V or even 5.2V. It worked perfectly for at least ten minutes with a 10cm cable (no bad reads) - when I increased it to 12cm it wouldn't even boot up once. Crashes immediately wit...
by Smonson
Fri Dec 07, 2018 10:09 am
Forum: ELECTRONICS
Topic: Tip restorer testing
Replies: 16
Views: 634

Re: Tip restorer testing

I don't know if anyone else does this, but after replacing my last ruined iron a few years ago I heard this advice, which I've been following since... after turning the iron off each time I use it, I coat the tip in solder to protect it from oxidising. By the way, soldering iron tips aren't solid ir...
by Smonson
Thu Dec 06, 2018 12:27 pm
Forum: HARDWARE DISCUSSIONS
Topic: Project: HDMI/DVI out for STFM
Replies: 435
Views: 29309

Re: Project: HDMI/DVI out for STFM

Haha, I'm sure my boss would love it, and everyone under 30 would be confused!
by Smonson
Thu Dec 06, 2018 12:20 pm
Forum: HARDWARE DISCUSSIONS
Topic: Project: HDMI/DVI out for STFM
Replies: 435
Views: 29309

Re: Project: HDMI/DVI out for STFM

Will do! ...soon, but not for a couple of nights, I have my work Christmas party tomorrow.

I can't actually set the voltage - my bench power supply can only supply 1.5A and the ST is just a bit too much for it. So I just have the ATX power supply which is fixed.
by Smonson
Thu Dec 06, 2018 11:19 am
Forum: HARDWARE DISCUSSIONS
Topic: Project: HDMI/DVI out for STFM
Replies: 435
Views: 29309

Re: Project: HDMI/DVI out for STFM

Oh, right. That was a DC offset. On the scope I saw occasional noise on the HDMI board ground of up to about +/- 650mV relative to PSU ground. But that shouldn't affect the level shifting buffer direction signal, I think, as it's localised to the mod board only.
by Smonson
Thu Dec 06, 2018 10:00 am
Forum: HARDWARE DISCUSSIONS
Topic: Project: HDMI/DVI out for STFM
Replies: 435
Views: 29309

Re: Project: HDMI/DVI out for STFM

I measured a differential of around -4 millivolts between the FPGA board to the chassis ground (measured off the big electrolytic near the power supply). Not too bad considering the whole mod draws a lot of current (over 300mA).
by Smonson
Thu Dec 06, 2018 9:14 am
Forum: HARDWARE DISCUSSIONS
Topic: Project: HDMI/DVI out for STFM
Replies: 435
Views: 29309

Re: Project: HDMI/DVI out for STFM

Sorry to hear about your CPU Icky. That really sucks.

Also I ran my machine on an ATX PSU at 5.06v for over fifteen minutes, but unfortunately didn't experience a single bad read. Ah, well.
by Smonson
Wed Dec 05, 2018 11:55 pm
Forum: HARDWARE DISCUSSIONS
Topic: Project: HDMI/DVI out for STFM
Replies: 435
Views: 29309

Re: Project: HDMI/DVI out for STFM

This gives me hope that I might be able to reproduce the issue here, by using a different power supply. Excellent!
by Smonson
Wed Dec 05, 2018 11:32 pm
Forum: HARDWARE DISCUSSIONS
Topic: Project: HDMI/DVI out for STFM
Replies: 435
Views: 29309

Re: Project: HDMI/DVI out for STFM

Icky wrote:
Wed Dec 05, 2018 11:29 pm
Thought I would give this a go too.

So I started at 4.3V and although my floppy failed to work the board dropped to the desktop and has been sat there stable. No resets.
Now that is interesting.