<html><head></head><body><div dir="auto">Re: 5.1V - it makes all the difference on a different system - the SPARCstation-10. Mind you, the cable harness for *that* is made of aluminium wire, so high-resistance.<br></div><br><br><div class="gmail_quote"><div dir="auto">On 6 June 2025 18:46:57 BST, Mouse via rescue <rescue@sunhelp.org> wrote:</div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<pre class="k9mail"><blockquote class="gmail_quote" style="margin: 0pt 0pt 1ex 0.8ex; border-left: 1px solid #729fcf; padding-left: 1ex;"><div dir="auto">I presume this is the manual you already found: =<br><a href="http://ftp.parisc-linux.org/docs/platforms/712_technical_manual.pdf,">http://ftp.parisc-linux.org/docs/platforms/712_technical_manual.pdf,</a><br></div></blockquote><div dir="auto"><br>I found it on manualslib.com, but, except for manualslib's obnoxious<br>UI and the line they add to the bottom of each page, it looks the same<br>(I side-by-side skimmed the first half-dozen pages).<br><br></div><blockquote class="gmail_quote" style="margin: 0pt 0pt 1ex 0.8ex; border-left: 1px solid #729fcf; padding-left: 1ex;"><div dir="auto">the =<br>power supply stuff is in 7-1, also a small bit about the =<br>START_PWR_DOWN_L signal.<br></div></blockquote><div dir="auto"><br>I saw that. I may experiment if I can't find anything more definitive.<br>As long as the board is happy with nothing driving either pin, I should<br>be OK. If it doesn't work, I'll try pulling the pins to various<br>voltages with 1K or so resistors....<br><br>Not that that's going to happen soon.<br><br>Actually, looking at table 7-1 now, I see that it says the main +5 is<br>actually supposed to be +5.1V, though I am inclined to doubt the<br>difference matters.<br><br>Page 7-2 says that a flashing light on the front panel indicates "a<br>problem with your graphics subsystem". You've actually got a machine<br>to look at; can you tell whether that LED is driven by the power<br>supply, as implied by the PDF's "on the power supply" implies, or by<br>the board? If the former, there must be some more complex protocol<br>than just a logic level between board and power supply....<br><br></div><blockquote class="gmail_quote" style="margin: 0pt 0pt 1ex 0.8ex; border-left: 1px solid #729fcf; padding-left: 1ex;"><div dir="auto">The wire colours described match what I have in my 712/60 (the<br>motherboard is A2263-66510)<br></div></blockquote><div dir="auto"><br>That's reassuring.<br><br></div><blockquote class="gmail_quote" style="margin: 0pt 0pt 1ex 0.8ex; border-left: 1px solid #729fcf; padding-left: 1ex;"><div dir="auto">pin one/white wire is closest to the SCSI connector.<br></div></blockquote><div dir="auto"><br>That matches the pin numbers silkscreened onto the board I have (there<br>there are numbers 1, 5, and 10 next to those three pins, the same on<br>each side).<br><br>/~\ The ASCII Mouse<br>\ / Ribbon Campaign<br> X Against HTML mouse@rodents-montreal.org<br>/ \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B<hr>rescue list - <a href="http://sunhelp.org/mailman/listinfo/rescue_sunhelp.org">http://sunhelp.org/mailman/listinfo/rescue_sunhelp.org</a><br></div></pre></blockquote></div></body></html>