--- /dev/null
+../../.git/annex/objects/wK/GG/SHA512-s215590--23ec4d09ab8ed674c51d1fa81145f4983e207ca989ec65c3035ba49c876aa01c37df3ca458b80ab7863607ec80ec8ac950bd03e7d83ec493adc40fef80c55f8d/SHA512-s215590--23ec4d09ab8ed674c51d1fa81145f4983e207ca989ec65c3035ba49c876aa01c37df3ca458b80ab7863607ec80ec8ac950bd03e7d83ec493adc40fef80c55f8d
\ No newline at end of file
--- /dev/null
+---
+title: M48T59Y-70PC1 With Battery Clip
+copyright: 2022 Nick Bowler
+license: cc-by-sa-4.0
+description: |
+ Finished repair of M48T59Y part with external battery clip glued on top.
--- /dev/null
+../../.git/annex/objects/jF/WK/SHA512-s821129--859631534da810c3a29d2246edf97a8d6a61a2ac67c21e18aee2753eb96a38a2856e45278f44db7a7a0ef9bb1c1ae6b00bc32e72b9b143b5d14a8abc7e376a1d/SHA512-s821129--859631534da810c3a29d2246edf97a8d6a61a2ac67c21e18aee2753eb96a38a2856e45278f44db7a7a0ef9bb1c1ae6b00bc32e72b9b143b5d14a8abc7e376a1d
\ No newline at end of file
--- /dev/null
+---
+title: M48T59Y-70PC1 Repair Complete
+copyright: 2022 Nick Bowler
+license: cc-by-sa-4.0
+description: |
+ Repaired M48T59Y chip installed onto the Sun Ultra 60 motherboard.
--- /dev/null
+../../.git/annex/objects/8M/9g/SHA512-s146926--2dd1f0b920387121d4e1f658f151417d55d65dfa27a6b397343deeebde08636236a0e123a9cfa3fdeef8204425c3f7d00a5e5dcee121126535a140a059f6fb04/SHA512-s146926--2dd1f0b920387121d4e1f658f151417d55d65dfa27a6b397343deeebde08636236a0e123a9cfa3fdeef8204425c3f7d00a5e5dcee121126535a140a059f6fb04
\ No newline at end of file
--- /dev/null
+---
+title: M48T59Y-70PC1 Wire Leads
+copyright: 2022 Nick Bowler
+license: cc-by-sa-4.0
+description: |
+ M48T59Y with battery leads connected, after disconnecting the internal
+ battery tabs.
--- /dev/null
+../../.git/annex/objects/98/V1/SHA512-s186948--c3277cf2aea7e159ee6203e9c7f5330f3a1c79a4d2c347c7637c19f354c7cafe2181b54fd40e84eba434a16340fb9cd3a87e76a636d45278846cb46c3d1f606e/SHA512-s186948--c3277cf2aea7e159ee6203e9c7f5330f3a1c79a4d2c347c7637c19f354c7cafe2181b54fd40e84eba434a16340fb9cd3a87e76a636d45278846cb46c3d1f606e
\ No newline at end of file
--- /dev/null
+---
+title: M48T59Y-70PC1 Battery Terminals
+copyright: 2022 Nick Bowler
+license: cc-by-sa-4.0
+description: |
+ M48T59Y with internal battery connections exposed. The negative connection
+ is on the left, closest to pin 14. The positive connection is on the right,
+ closest to pin 16.
--- /dev/null
+../../.git/annex/objects/5f/mJ/SHA512-s141937--ebbd8a2ad4b6d4f1c6d66d9f7ba76685c5281bff3d0fb34f7e00e3016b8422c4935aa9b87caa1c4f8ed9b1b7f727b4f2c97d49991f483317c8248f536c225620/SHA512-s141937--ebbd8a2ad4b6d4f1c6d66d9f7ba76685c5281bff3d0fb34f7e00e3016b8422c4935aa9b87caa1c4f8ed9b1b7f727b4f2c97d49991f483317c8248f536c225620
\ No newline at end of file
--- /dev/null
+---
+title: M48T59Y-70PC1
+copyright: 2022 Nick Bowler
+license: cc-by-sa-4.0
+description: |
+ <p>The <abbr title="Non-Volatile Random Access Memory">NVRAM</abbr> module
+ used in my Sun Ultra 60 workstation. This combines a normal memory with a
+ real-time clock and an internal lithium primary cell to maintain everything.
+ However, the internal cell is long dead so this chip is dead too.</p>
p.img { margin: 0.5em 0; }
}
+
+ @media (max-width: 45em) {
+ .inline.gallery {
+ display: block;
+ p.img {
+ a { max-width: 24em; }
+ margin: 1em 0;
+ }
+ }
+ }
}
p.img {
border: solid 2px;
}
+ a.left { margin: 0 1em 0.5em 0; float: left; clear: left; }
+ a.right { margin: 0 0 0.5em 1em; float: right; clear: right; }
+ a.left, a.right {
+ @media (max-width: 45em) { float: none; margin: 0; }
+
+ max-width: 24em;
+ }
+
small {
@include usecolours($color: foreground);
- text-align: justify;
@media (max-width: 24em) { text-align: left; }
padding: 0.5ex;
display: block;
+ display: -moz-inline-box;
+ display: inline-block;
+ text-align: justify;
font-size: 0.9em;
}
}
font-family: monospace;
font-size: 0.95em;
&:before { content: "% "; }
+ &.ok:before { content: "ok "; }
&>span { white-space: nowrap; }
blockquote & {
display: block;
+ & + br { display: none; }
text-align: left;
padding-left: 3em;
text-indent: -3em;
table {
@include usecolour(border-top, ruledefault, 1px solid);
border-collapse: collapse;
+ clear: both;
width: 100%;
}
--- /dev/null
+---
+title: M48T59Y-70PC1 NVRAM Battery Replacement
+copyright: 2022 Nick Bowler
+license: cc-by-sa-4.0
+published: 2022-07-09T12:12:21-0400
+---
+
+*[NVRAM]: Non-Volatile Random Access Memory
+*[SRAM]: Static Random-Access Memory
+*[NOS]: New Old Stock
+*[DIP]: Dual In-line Package
+*[SOIC]: Small-Outline Integrated Circuit
+*[MAC]: Media Access Control
+
+Thanks to [Mark Henderson's Sun NVRAM FAQ][nvram-faq] for providing invaluable
+insight regarding this repair.
+{:article-info="article-info"}
+
+[nvram-faq]: http://web.archive.org/web/20150919135835/http://www.squirrel.com/sun-nvram-hostid.faq.html
+
+The Sun Ultra 60 workstation uses an ST M48T59Y-70PC1 battery-backed SRAM with
+real-time clock. When the embedded lithium primary cell inevitably dies, the
+chip is essentially useless. The most noticeable negative effect of a dead
+chip is that the workstation always powers up in a default configuration with
+diag-switch? true, running several minutes of self tests every time, with
+bogus MAC and host ID values.
+
+<%= floating_img(@items["/images/m48t59y.jpg"], caption: <<EOF
+You don't even know you are already dead.
+EOF
+) %>
+
+This device was branded obsolescent by the manufacturer in April of 2008 and
+has presumably been out of production since around that time. Similar chips
+like the M48T58Y are still made but they are expensive (around $40) and slight
+differences may result in compatibility problems. It appears that NOS parts
+can be found fairly cheap online but these must be almost 15 years old by now
+and who knows what state the embedded batteries are in. No thanks.
+
+One option could be to find the SOIC version of the M48T59Y for which NOS also
+seems to be available, although somewhat less readily than the DIP modules, and
+then construct an adapter board to fit into the DIP socket on the motherboard.
+The SOIC package does not include the battery and crystal; instead, it has
+contacts on the top to attach a separate "SNAPHAT" package which are still
+made. This would be complicated and somewhat expensive.
+
+Fortunately, a straightforward (if time-consuming) repair is possible. This
+is a literal hackjob: we can dig through the potting to expose the battery
+terminals, disconnect the internal battery, and connect a normal battery clip.
+This enables the use of readily-available CR2032 lithium primary cells that can
+be replaced as needed, just like a normal PC. Since we already have the chip
+we need, it is not necessary to source any obscure or expensive components.
+
+<%=
+floating_img(@items["/images/m48t59y-terminals.jpg"], left: 1, caption: '')
+%>
+
+<%=
+floating_img(@items["/images/m48t59y-solder.jpg"], left: 1, caption: '')
+%>
+
+The battery contacts are located on the end opposite pin 1, between pins
+14 and 15. Looking underneath the chip there is a small well at either end
+filled with potting compound. The battery connections are inside one of
+these. Using a knife, cut back the plastic outer shell on the battery side,
+then begin scraping away potting compound until the terminals are exposed.
+You can use a suitable DIP socket to help protect the pins from accidental
+damage.
+
+Once the terminals are exposed, the internal battery must be disconnected.
+The thick protruding tabs near the bottom of the module are what we want
+to solder to. The vertical strips going up and into the module are the
+internal battery terminals. These can be desoldered from the tabs and
+lifted out of the way, or simply cut off.
+
+With the time-consuming parts completed it is a straightforward matter to
+connect a normal battery clip to the exposed terminals. As the Ultra 60 has
+no clearance issues I simply glued it to the top of the chip. Since this
+would obscure the barcode sticker which is useful to restore the original MAC
+address and host ID, I moved this sticker to the side of the chip.
+
+Finally all that remains is to put everything back together and power up
+the system. The system will run the full self-diagnostic tests again and
+if all goes well, the "NVRAM Battery Detect Test" should no longer display
+any errors. At the ok prompt, the memory can now be initialized. Where
+"AA BB CC" are the six hexadecimal digits from the orange barcode sticker:
+
+<kbd class='ok'>set-defaults</kbd><br/>
+<kbd class='ok'>setenv diag-switch? false</kbd><br/>
+<kbd class='ok'>8 0 20 AA BB CC AABBCC mkpl<br/><em><Ctrl-D><Ctrl-R></em></kbd><br/>
+<kbd class='ok'>.idprom</kbd><br/>
+<kbd class='ok'>reset</kbd>
+
+<%= gallery_img(@items["/images/m48t59y-fixed.jpg"], caption: <<EOF
+Just like a bought one!
+EOF
+) %>
+<%= gallery_img(@items["/images/m48t59y-installed.jpg"], caption: <<EOF
+There's no place like home in the Ultra 60.
+EOF
+) %>
</xsl:template>
<!-- For paragraphs containing only kbd elements, wrap in blockquote. -->
-<xsl:template match='xhtml:p[*[last()=count(../xhtml:kbd)]]'>
+<xsl:template match='xhtml:p[*[last()=count(../xhtml:kbd|../xhtml:br)]]'>
<blockquote>
<xsl:copy>
<xsl:apply-templates select='node()|@*' />
</p>
</xsl:template>
+<!-- Article info block inserted between heading and main contents -->
<xsl:template match='xhtml:h1[not(preceding::xhtml:h1)]'>
+ <xsl:variable name='nodes'
+ select='/document/article/published|//xhtml:*[@article-info]' />
+
<xsl:copy><xsl:apply-templates select='node()|@*' /></xsl:copy>
- <xsl:if test='/document/article/published'>
+
+ <xsl:if test='$nodes'>
<div id='article-info'>
- <p>
- <xsl:text>Posted </xsl:text>
- <xsl:value-of select='/document/article/published' />
- </p>
+ <xsl:apply-templates mode='article-info' select='$nodes'>
+ <xsl:sort data-type='number'
+ select='number(generate-id(..)=generate-id(/document/article))' />
+ </xsl:apply-templates>
</div>
</xsl:if>
</xsl:template>
+<xsl:template mode='article-info' match='/document/article/published'>
+ <p>
+ <xsl:text>Posted </xsl:text>
+ <xsl:value-of select='/document/article/published' />
+ <xsl:if test='/document/article/updated'>
+ <xsl:text>, last updated </xsl:text>
+ <xsl:value-of select='/document/article/updated' />
+ </xsl:if>
+ </p>
+</xsl:template>
+
+<xsl:template match='*[@article-info]' />
+<xsl:template mode='article-info' match='*[@article-info]'>
+ <xsl:copy>
+ <xsl:apply-templates select='@*[local-name() != "article-info"]' />
+ <xsl:apply-templates select='node()' />
+ </xsl:copy>
+</xsl:template>
+
<xsl:template name='imgpara' match='xhtml:p[count(*)=1]
[normalize-space(text())=""]
[descendant::xhtml:img]'>
<xsl:variable name='images' select='key("gallery", generate-id(.))' />
<xsl:choose>
<xsl:when test='count($images) > 1'>
- <div class='gallery'>
+ <div>
+ <xsl:attribute name='class'>
+ <xsl:text>gallery</xsl:text>
+ <xsl:if test='//xhtml:a[f:contains-token(@class, "left")
+ or f:contains-token(@class, "right")]'>
+ <xsl:text> inline</xsl:text>
+ </xsl:if>
+ </xsl:attribute>
<xsl:for-each select='$images'>
<xsl:call-template name='imgpara' />
</xsl:for-each>
<!--
Nick's web site: XSLT helper functions.
- Copyright © 2019-2021 Nick Bowler
+ Copyright © 2019-2022 Nick Bowler
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
</func:result>
</func:function>
+<!--
+ f:contains-token(list, token)
+ Returns true iff the space-separated list contains the given token
+-->
+<func:function name='f:contains-token'>
+ <xsl:param name='haystack' />
+ <xsl:param name='needle' />
+
+ <func:result select='contains(
+ concat(" ", normalize-space($haystack), " "),
+ concat(" ", normalize-space($needle), " ")
+ )' />
+</func:function>
+
</xsl:stylesheet>
# Nick's web site: Ruby helpers for processing
#
-# Copyright © 2018-2021 Nick Bowler
+# Copyright © 2018-2022 Nick Bowler
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
name.to_s.capitalize + " " + ($counters[item][name] += 1).to_s
end
-def img_rep_fallback(item, rep)
- return rep unless item.reps[rep].raw_path.nil?
- return :large
+# Return a hash containing :src, :width and :height based on an image item rep.
+def img_rep_attrs(item, rep)
+ rep = :large if item.reps[rep].raw_path.nil?
+ attrs = {}
+
+ attrs[:src] ||= item_uri(item, rep: rep)
+ attrs[:width], attrs[:height] = FastImage.size(item.reps[rep].raw_path)
+
+ return attrs
end
-def gallery_img(item, rep: :large, alt: nil, caption: nil)
+def embed_img(item, rep: :large, caption: nil, block_attrs: {}, img_attrs: {})
return "[image not found]" unless item
- alt ||= item[:title]
- caption ||= alt
+ img_attrs[:alt] ||= item[:title]
+ caption ||= img_attrs[:alt]
caption = caption.strip
caption.gsub!(/\s+/, " ")
- rep = img_rep_fallback(item, rep)
- attrs = { :src => item_uri(item, rep: rep), :alt => item[:title] }
- attrs[:width], attrs[:height] = FastImage.size(item.reps[rep].raw_path)
+ img_attrs = img_rep_attrs(item, rep).merge(img_attrs)
+ block_attrs[:href] = item_uri(item, rep: :info)
b = Nokogiri::XML::Builder.new do |xml|
- xml.a(:href => item_uri(item, rep: :info)) {
- xml.img(attrs, "generate-gallery" => "generate-gallery")
+ xml.a(block_attrs) {
+ xml.img(img_attrs)
unless caption.empty?
xml << " ⁠"
xml.small { xml << caption }
b.to_xml(:save_with => Nokogiri::XML::Node::SaveOptions::NO_DECLARATION)
end
+def gallery_img(item, rep: :medium, caption: nil, alt: nil)
+ attrs = { alt: alt, "generate-gallery" => "generate-gallery" }
+ embed_img(item, rep: rep, caption: caption, img_attrs: attrs)
+end
+
+def floating_img(item, rep: :medium, caption: nil, alt: nil, left: nil)
+ battrs = { class: if left then "left" else "right" end }
+ attrs = { alt: alt }
+
+ embed_img(item, rep: rep, caption: caption,
+ block_attrs: battrs, img_attrs: attrs)
+end
+
def expand_copyright(copyright)
result = { :years => {} }
projects / homepage.git / commitdiff
