https://wiki.retrotechcollection.com/index.php?action=history&feed=atom&title=File%3AIBM_5322_Computer_Service_Manual_SY34-0171-0.pdf 2026-09-25T18:28:58Z Revision history for this page on the wiki MediaWiki 1.46.0 https://wiki.retrotechcollection.com/index.php?title=File:IBM_5322_Computer_Service_Manual_SY34-0171-0.pdf&diff=12921&oldid=prev 2026-09-24T21:10:38Z

<p>IBM&#039;s own CE manual for the System/23 Datamaster&#039;s 5322 computer</p> <p><b>New page</b></p><div>== Summary ==<br /> &#039;&#039;&#039;IBM 5322 Computer Service Manual&#039;&#039;&#039;, order number &#039;&#039;&#039;SY34-0171-0&#039;&#039;&#039;, December 1980. Volume 1 of the IBM System/23 Service Library, covering the &#039;&#039;&#039;IBM 5322&#039;&#039;&#039; computer of the [[IBM System/23 Datamaster]] system &amp;mdash; processor, processor features, power supply, keyboard, CRT display unit and diskette drives.<br /> <br /> This is the machine&#039;s own CE manual, and it settles several things that community accounts of the Datamaster have got wrong:<br /> <br /> * &#039;&#039;&#039;The power supply is ferroresonant, not linear.&#039;&#039;&#039; It has a &#039;&#039;&#039;resonant capacitor C6&#039;&#039;&#039;, a tapped transformer with jumper-selected mains taps, and IBM&#039;s own DANGER notice: &#039;&#039;&#039;&quot;Up to 800 Vac is generated in the power supply.&quot;&#039;&#039;&#039;<br /> * &#039;&#039;&#039;Each DC output has its own fuse&#039;&#039;&#039;: F1 &amp;minus;5 V (0.5 A), F2 +12 V (1.5 A), F3 &amp;minus;12 V (0.5 A), F4 +24 V (1.5 A), F5 +5 V (10 A), plus F6 on the AC input.<br /> * IBM publishes &#039;&#039;&#039;voltage tolerances and peak-to-peak ripple limits&#039;&#039;&#039; for all five rails and for Power Good, and a method for measuring ripple with a service meter and a 0.22 &amp;micro;F series capacitor.<br /> * &#039;&#039;&#039;The CRT is 305 mm (12 in.)&#039;&#039;&#039;, displaying 24 lines of 80 characters.<br /> * The keyboard has &#039;&#039;&#039;83 keys&#039;&#039;&#039;.<br /> * The 5322 model numbers encode the configuration: second digit is memory (1 = 32K, 2 = 64K, 3 = 96K, 4 = 128K), third digit is diskette (0 = none, 1 = one drive 0.25 MB, 2 = two drives 0.5 MB, 3 = one drive 1 MB, 4 = two drives 2 MB).<br /> * Three power supplies were built &amp;mdash; PN &#039;&#039;&#039;6838279&#039;&#039;&#039; (60 Hz, Canada and US), &#039;&#039;&#039;6838280&#039;&#039;&#039; (60 Hz, GBG/I) and &#039;&#039;&#039;6838281&#039;&#039;&#039; (50 Hz, GBG/I) &amp;mdash; with different fuse layouts and different mains-tap jumper tables.<br /> <br /> == Source ==<br /> <br /> Scanned by bitsavers.org and mirrored at the Internet Archive as item &lt;code&gt;bitsavers_ibmsystem2ComputerServiceManualDec80_16181636&lt;/code&gt;. Hosted here so the Datamaster pages can cite a copy that will not move.<br /> <br /> == Licence ==<br /> <br /> Copyright International Business Machines Corporation, 1980. Hosted for the non-commercial repair and preservation of a machine IBM withdrew forty years ago. If you are the rights holder and want this taken down, please say so and it will be removed.<br /> <br /> [[Category:IBM Service Manuals]]<br /> [[Category:Service Manuals]]</div>

Josh