Hitachi SuperScan 812

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Revision as of 18:32, 10 September 2022 by Huntertur (talk | contribs) (→‎History: Goodbye monitor)
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A kangaroo ponders the meaning of the monitor

The Hitachi SuperScan 812 (CM812U) is my standalone CRT monitor. I use it for all my old desktops.


  • VGA connection
  • Easily supports 1600x1200 @ 85 Hz
  • Protects against bad frequencies with an "INVALID SCAN FREQ." message
  • Protects against bad signals (i.e. I messed up the settings on my DB-15 adapter) with a rapidly blinking light
  • Has the loudest degauss noise in existence


  • The image is susceptible to frequent popping at weird resolutions, like when I have my DB-15 adapter set to output at 1152x870. When not at a weird resolution, things are OK.
  • When displaying a low resolution at a low frequency like 640x480 @ 60 Hz, the left and right sides of the image are horizontally squished. Messing with the buttons on the front of the monitor doesn't seem to alleviate this. Thankfully, once I get a proper display resolution working, the problem seems to disappear.


  • The flyback transformer's part number is HFL1327RD


  • Sat in a coworker's storage for years.
  • Acquired from said coworker.
  • 2022-05-17: An insanely loud pop occurs when turning the monitor. No indications of damage, though -- the picture is OK, the surge protector or circuit breaker didn't trip, and there was no smoke.
  • 2022-05-19: The popping has gotten really bad. Thankfully, it's the normal quiet volume for popping. I temporarily stop using it.
  • 2022-05-22: I take the case and shield off and clean out the dust and debris. There was a good amount of dust and more little solid pieces than I usually see in equipment. Decided to let it sit for a bit before testing. When testing, the issue was even worse than before cleaning.
  • 2022-09-10: Given away at VCF Midwest.