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Energizing a vacuum-tube flip-flop module from a 1948 IBM system

Ken Shirriff Blog · published 31 July 2026

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https://static.righto.com/images/ibm-650-flipflop/ibm-604-opened.jpg
static.righto.com
https://ed-thelen.org/comp-hist/IBM-604.html
ed-thelen.org
https://static.righto.com/images/ibm-650-flipflop/ibm-tr3-module.jpg
static.righto.com
Powering up a module from the IBM 604: an electronic calculator from 1948 Read at the source ↗
righto.com
https://static.righto.com/images/ibm-650-flipflop/tube-diagram.jpg
static.righto.com
https://bitsavers.org/pdf/ibm/604/227-7609-0_604_CE_man_1958.pdf
bitsavers.org
https://www.righto.com/2017/04/1950s-tax-preparation-plugboard.html
righto.com
https://www.radiomuseum.org/tubes/tube_2033.html
radiomuseum.org
https://static.righto.com/images/ibm-650-flipflop/2033-tube.jpg
static.righto.com
https://static.righto.com/images/ibm-650-flipflop/filaments.jpg
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https://static.righto.com/images/ibm-650-flipflop/inverter.jpg
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https://static.righto.com/images/ibm-650-flipflop/inverter-loop.png
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https://static.righto.com/images/ibm-650-flipflop/schematic.jpg
static.righto.com
https://patents.google.com/patent/GB148582A
patents.google.com
https://babel.hathitrust.org/cgi/pt?id=mdp.39015080387684&seq=336
babel.hathitrust.org
https://static.righto.com/images/ibm-650-flipflop/eccles-jordan.jpg
static.righto.com
https://www.worldradiohistory.com/Archive-Electronics/30s/Electronics-1939-08.pdf
worldradiohistory.com
https://patents.google.com/patent/US2584811A
patents.google.com
https://www.reddit.com/r/chipdesign/comments/yxv7c9/number_of_flip_flops_in_a_modern_intel_chipset/
reddit.com
https://bsky.app/profile/righto.com
bsky.app
https://www.righto.com/p/index.html
righto.com
https://static.righto.com/images/ibm-650-flipflop/IBM_150_Extra_Engineers_1951.jpg
static.righto.com
https://commons.wikimedia.org/wiki/File:IBM_150_Extra_Engineers_1951.jpg
commons.wikimedia.org
https://static.righto.com/images/ibm-650-flipflop/ibm-604-and-521.jpg
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https://static.righto.com/images/ibm-650-flipflop/card-codes.jpg
static.righto.com
http://bitsavers.org/pdf/ibm/punchedCard/Keypunch/029/A24-3332-3_29_Reference_Man.pdf
bitsavers.org
https://youtu.be/X_OLAV1GwQ0?si=2iJEQaJFABBjNMoT&t=289
youtu.be
https://bitsavers.org/pdf/ibm/604/22-5279-10_604_OperMan.pdf
bitsavers.org
https://frank.pocnet.net/sheets/137/5/5965.pdf
frank.pocnet.net
https://www.google.com/books/edition/THE_INDIAN_LISTENER/jgThDwAAQBAJ?hl=en&gbpv=1&pg=PA405
google.com
https://static.righto.com/images/ibm-650-flipflop/manual-schematic.jpg
static.righto.com