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by exxos
Fri May 24, 2024 9:35 pm
Forum: RAM UPGRADES
Topic: STFM 4MB RAM EXPANSION SUCCESS
Replies: 16
Views: 490

Re: STFM 4MB RAM EXPANSION SUCCESS

First, thank you for your really wise advice. By separating the wires from each other, it works! :thumbup: I'm curious that you explain this phenomenon to me and why we don't have this with the connected cables (4Mo). It's " Parasitic capacitive coupling " between the two wires. When 4MB ...
by exxos
Fri May 24, 2024 3:41 pm
Forum: ELECTRONICS
Topic: PC keyboard duplicates space keystrokes
Replies: 8
Views: 161

Re: PC keyboard duplicates space keystrokes

ijor wrote: Fri May 24, 2024 2:03 pm Edit: For some reason a link to Amazon doesn't work.
Thats because of HTTPS links are not allowed across different domains. If you remove HTTPS, it should work fine.
by exxos
Fri May 24, 2024 1:45 pm
Forum: RAM UPGRADES
Topic: STFM 4MB RAM EXPANSION SUCCESS
Replies: 16
Views: 490

Re: STFM 4MB RAM EXPANSION SUCCESS

You could also try this. The black wire can solder anywhere to GND.

4MB_SMT.jpg
4MB_SMT.jpg (136.56 KiB) Viewed 155 times
by exxos
Fri May 24, 2024 1:06 pm
Forum: RAM UPGRADES
Topic: STFM 4MB RAM EXPANSION SUCCESS
Replies: 16
Views: 490

Re: STFM 4MB RAM EXPANSION SUCCESS

Just a small observation that your switch is on top of the metal shifter box, if any of those switch contacts just happened to catch the metalwork , then that could also lead to a crash.

Also have you tried separating the 2 wires to the switch ? They should be kept as short as possible also.
by exxos
Fri May 24, 2024 12:40 pm
Forum: RAM UPGRADES
Topic: Exxos 4MB Ram Upgrade for C070789 strange issue
Replies: 12
Views: 3430

Re: Exxos 4MB Ram Upgrade for C070789 strange issue

I'm assuming you guys are toggling the switch with the power off ?
by exxos
Fri May 24, 2024 11:29 am
Forum: MEMBER BLOGS
Topic: exxos blog - random goings on
Replies: 3076
Views: 829302

Re: exxos blog - random goings on

The drama continues, albeit partly my fault it seems :roll: The original alignment of the PLD is correct, but then JLC "corrected it" and now its wrong. For some reason the pin 1 dot wasn't exported in the silk screen for that package :roll: But then surely JLC would have literally had to ...
by exxos
Fri May 24, 2024 10:51 am
Forum: RAM UPGRADES
Topic: Exxos 4MB Ram Upgrade for C070789 - Different Issue
Replies: 12
Views: 283

Re: Exxos 4MB Ram Upgrade for C070789 - Different Issue

rubber_jonnie wrote: Fri May 24, 2024 10:39 am Tweaking the pins is usually good enough to get the socket working for a long time
I concur also.

Removing the socket can be tricky and often leads to motherboard damages. The golden rule of electronics applies here, if it is not broken, then don't fix it!
by exxos
Fri May 24, 2024 10:21 am
Forum: HARDWARE ESSENTIALS
Topic: Falcon 030 3-in-1 monitor adapter
Replies: 49
Views: 30811

Re: Falcon 030 3-in-1 monitor adapter

what is the power requirement for the blowup board ? Around 100mA. The board I got with the Falcon I just bought has a USB A, is it an input for 5v ? Yes. You said not using a phone charger, why ? They tend to have very bad regulation on light loads. I tried to alleviate this problem on later build...
by exxos
Fri May 24, 2024 10:15 am
Forum: ELECTRONICS
Topic: PC keyboard duplicates space keystrokes
Replies: 8
Views: 161

Re: PC keyboard duplicates space keystrokes

If it is a USB keyboard I would certainly spray some contact cleaner on the USB socket and plug or try a different USB socket. I've been "had" of thinking I have a faulty keyboard when it was simply a bad connection.
by exxos
Fri May 24, 2024 10:12 am
Forum: HARDWARE ISSUES
Topic: Exxos Diagnostic Cartridge Issue - Jumper selections
Replies: 15
Views: 338

Re: Exxos Diagnostic Cartridge Issue - Jumper selections

But the constant restart cycle issue was still present when I powered up the STFM with the cartridge removed. Any suggestions? Sounds more like a PSU issue to me. Have to at least recapped the PSU ? Changed the caps in the reset circuit ? Re-seated and cleaned the chips in sockets ? If you have not...

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