From eb8b04d03e5355826a8e4e53274faf24d2320cd3 Mon Sep 17 00:00:00 2001
From: Nick Bowler
Date: Sat, 9 Jul 2022 12:12:20 -0400
Subject: [PATCH 1/1] M48T59Y battery replacement
---
content/images/m48t59y-fixed.jpg | 1 +
content/images/m48t59y-fixed.yaml | 6 ++
content/images/m48t59y-installed.jpg | 1 +
content/images/m48t59y-installed.yaml | 6 ++
content/images/m48t59y-solder.jpg | 1 +
content/images/m48t59y-solder.yaml | 7 ++
content/images/m48t59y-terminals.jpg | 1 +
content/images/m48t59y-terminals.yaml | 8 ++
content/images/m48t59y.jpg | 1 +
content/images/m48t59y.yaml | 9 +++
content/style.scss | 25 ++++++-
content/weblog/ultra60-nvram.md | 101 ++++++++++++++++++++++++++
layouts/default.xsl | 45 ++++++++++--
layouts/functions.xsl | 16 +++-
lib/helpers.rb | 42 ++++++++---
15 files changed, 249 insertions(+), 21 deletions(-)
create mode 120000 content/images/m48t59y-fixed.jpg
create mode 100644 content/images/m48t59y-fixed.yaml
create mode 120000 content/images/m48t59y-installed.jpg
create mode 100644 content/images/m48t59y-installed.yaml
create mode 120000 content/images/m48t59y-solder.jpg
create mode 100644 content/images/m48t59y-solder.yaml
create mode 120000 content/images/m48t59y-terminals.jpg
create mode 100644 content/images/m48t59y-terminals.yaml
create mode 120000 content/images/m48t59y.jpg
create mode 100644 content/images/m48t59y.yaml
create mode 100644 content/weblog/ultra60-nvram.md
diff --git a/content/images/m48t59y-fixed.jpg b/content/images/m48t59y-fixed.jpg
new file mode 120000
index 0000000..d0f066e
--- /dev/null
+++ b/content/images/m48t59y-fixed.jpg
@@ -0,0 +1 @@
+../../.git/annex/objects/wK/GG/SHA512-s215590--23ec4d09ab8ed674c51d1fa81145f4983e207ca989ec65c3035ba49c876aa01c37df3ca458b80ab7863607ec80ec8ac950bd03e7d83ec493adc40fef80c55f8d/SHA512-s215590--23ec4d09ab8ed674c51d1fa81145f4983e207ca989ec65c3035ba49c876aa01c37df3ca458b80ab7863607ec80ec8ac950bd03e7d83ec493adc40fef80c55f8d
\ No newline at end of file
diff --git a/content/images/m48t59y-fixed.yaml b/content/images/m48t59y-fixed.yaml
new file mode 100644
index 0000000..6038682
--- /dev/null
+++ b/content/images/m48t59y-fixed.yaml
@@ -0,0 +1,6 @@
+---
+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.
diff --git a/content/images/m48t59y-installed.jpg b/content/images/m48t59y-installed.jpg
new file mode 120000
index 0000000..2fa0639
--- /dev/null
+++ b/content/images/m48t59y-installed.jpg
@@ -0,0 +1 @@
+../../.git/annex/objects/jF/WK/SHA512-s821129--859631534da810c3a29d2246edf97a8d6a61a2ac67c21e18aee2753eb96a38a2856e45278f44db7a7a0ef9bb1c1ae6b00bc32e72b9b143b5d14a8abc7e376a1d/SHA512-s821129--859631534da810c3a29d2246edf97a8d6a61a2ac67c21e18aee2753eb96a38a2856e45278f44db7a7a0ef9bb1c1ae6b00bc32e72b9b143b5d14a8abc7e376a1d
\ No newline at end of file
diff --git a/content/images/m48t59y-installed.yaml b/content/images/m48t59y-installed.yaml
new file mode 100644
index 0000000..2c74fe6
--- /dev/null
+++ b/content/images/m48t59y-installed.yaml
@@ -0,0 +1,6 @@
+---
+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.
diff --git a/content/images/m48t59y-solder.jpg b/content/images/m48t59y-solder.jpg
new file mode 120000
index 0000000..5d8078e
--- /dev/null
+++ b/content/images/m48t59y-solder.jpg
@@ -0,0 +1 @@
+../../.git/annex/objects/8M/9g/SHA512-s146926--2dd1f0b920387121d4e1f658f151417d55d65dfa27a6b397343deeebde08636236a0e123a9cfa3fdeef8204425c3f7d00a5e5dcee121126535a140a059f6fb04/SHA512-s146926--2dd1f0b920387121d4e1f658f151417d55d65dfa27a6b397343deeebde08636236a0e123a9cfa3fdeef8204425c3f7d00a5e5dcee121126535a140a059f6fb04
\ No newline at end of file
diff --git a/content/images/m48t59y-solder.yaml b/content/images/m48t59y-solder.yaml
new file mode 100644
index 0000000..dc6253b
--- /dev/null
+++ b/content/images/m48t59y-solder.yaml
@@ -0,0 +1,7 @@
+---
+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.
diff --git a/content/images/m48t59y-terminals.jpg b/content/images/m48t59y-terminals.jpg
new file mode 120000
index 0000000..795475d
--- /dev/null
+++ b/content/images/m48t59y-terminals.jpg
@@ -0,0 +1 @@
+../../.git/annex/objects/98/V1/SHA512-s186948--c3277cf2aea7e159ee6203e9c7f5330f3a1c79a4d2c347c7637c19f354c7cafe2181b54fd40e84eba434a16340fb9cd3a87e76a636d45278846cb46c3d1f606e/SHA512-s186948--c3277cf2aea7e159ee6203e9c7f5330f3a1c79a4d2c347c7637c19f354c7cafe2181b54fd40e84eba434a16340fb9cd3a87e76a636d45278846cb46c3d1f606e
\ No newline at end of file
diff --git a/content/images/m48t59y-terminals.yaml b/content/images/m48t59y-terminals.yaml
new file mode 100644
index 0000000..806df38
--- /dev/null
+++ b/content/images/m48t59y-terminals.yaml
@@ -0,0 +1,8 @@
+---
+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.
diff --git a/content/images/m48t59y.jpg b/content/images/m48t59y.jpg
new file mode 120000
index 0000000..40e10d3
--- /dev/null
+++ b/content/images/m48t59y.jpg
@@ -0,0 +1 @@
+../../.git/annex/objects/5f/mJ/SHA512-s141937--ebbd8a2ad4b6d4f1c6d66d9f7ba76685c5281bff3d0fb34f7e00e3016b8422c4935aa9b87caa1c4f8ed9b1b7f727b4f2c97d49991f483317c8248f536c225620/SHA512-s141937--ebbd8a2ad4b6d4f1c6d66d9f7ba76685c5281bff3d0fb34f7e00e3016b8422c4935aa9b87caa1c4f8ed9b1b7f727b4f2c97d49991f483317c8248f536c225620
\ No newline at end of file
diff --git a/content/images/m48t59y.yaml b/content/images/m48t59y.yaml
new file mode 100644
index 0000000..7258310
--- /dev/null
+++ b/content/images/m48t59y.yaml
@@ -0,0 +1,9 @@
+---
+title: M48T59Y-70PC1
+copyright: 2022 Nick Bowler
+license: cc-by-sa-4.0
+description: |
+ The NVRAM 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.
diff --git a/content/style.scss b/content/style.scss
index 2708bb4..abc6c49 100644
--- a/content/style.scss
+++ b/content/style.scss
@@ -76,6 +76,16 @@ h5 { @include header_size(60em, 1em); }
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 {
@@ -94,12 +104,22 @@ 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;
}
}
@@ -137,10 +157,12 @@ kbd {
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;
@@ -160,6 +182,7 @@ kbd {
table {
@include usecolour(border-top, ruledefault, 1px solid);
border-collapse: collapse;
+ clear: both;
width: 100%;
}
diff --git a/content/weblog/ultra60-nvram.md b/content/weblog/ultra60-nvram.md
new file mode 100644
index 0000000..ec96370
--- /dev/null
+++ b/content/weblog/ultra60-nvram.md
@@ -0,0 +1,101 @@
+---
+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: <
+
+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:
+
+set-defaults
+setenv diag-switch? false
+8 0 20 AA BB CC AABBCC mkpl
<Ctrl-D><Ctrl-R>
+.idprom
+reset
+
+<%= gallery_img(@items["/images/m48t59y-fixed.jpg"], caption: <
+<%= gallery_img(@items["/images/m48t59y-installed.jpg"], caption: <
diff --git a/layouts/default.xsl b/layouts/default.xsl
index d5be103..7681933 100644
--- a/layouts/default.xsl
+++ b/layouts/default.xsl
@@ -222,7 +222,7 @@
-
+
@@ -400,18 +400,42 @@
+
+
+
-
+
+
+
+
+ Posted
+
+
+ , last updated
+
+
+
+
+
+
+
+
+
+
+
+
+
@@ -439,7 +463,14 @@
-
+
+
+ gallery
+
+ inline
+
+
diff --git a/layouts/functions.xsl b/layouts/functions.xsl
index a88c338..bbaf90e 100644
--- a/layouts/functions.xsl
+++ b/layouts/functions.xsl
@@ -1,7 +1,7 @@
+
+
+
+
+
+
+
diff --git a/lib/helpers.rb b/lib/helpers.rb
index 77916dd..24d37e4 100644
--- a/lib/helpers.rb
+++ b/lib/helpers.rb
@@ -1,6 +1,6 @@
# 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
@@ -77,26 +77,31 @@ def counter(name = :default, item = @item)
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 }
@@ -106,6 +111,19 @@ def gallery_img(item, rep: :large, alt: nil, caption: nil)
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 => {} }
--
2.43.2