IBM 5151

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An IBM PC with a 5151 monitor

The IBM 5151 is a 12" transistor–transistor logic (TTL) monochrome monitor, shipped with the original IBM Personal Computer for use with the IBM Monochrome Display Adapter.[1] A few other cards were designed to work with it, such as the Hercules Graphics Card.

The monitor has an 11.5-inch wide CRT (measured diagonally) with 90 degree deflection, etched to reduce glare, with a resolution of 350 horizontal lines and a 50 Hz refresh rate. It uses TTL digital inputs through a 9-pin D-shell connector. It is also plugged into the female AC port on the IBM PC power supply, and thus did not have a power switch of its own.

P39 phosphor produced a bright green monochrome image intended for displaying high-resolution text. This phosphor has high persistence, which decreases display flicker but causes smearing when the image changes.[2]


Type Digital, TTL[3]
Resolution 720 x 350
Size 11 in (H) x 15 in (L) x14 in (D)[3]
Weight 12.5 lbs[3]
Heat output 95.2 W[3]
H-freq 18.432 kHz[3]
V-freq 50 Hz[3]


  1. ^ "The IBM XT LIVES!!". Archived from the original on 2001-07-12. Retrieved 2008-11-16.
  2. ^ Bottles full of nothing, by Steve Gibson, InfoWorld, 11 Jun 1984
  3. ^ a b c d e f IBM Monochrome Display user manual

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