IBM 5151

File:IBM PC XT color.jpg

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.{{cite web|url=http://biz.yahoo.com/fo/001026/qa_ibmxt.html |title=The IBM XT LIVES!!|work=Forbes.com|accessdate=2008-11-16 |archiveurl = https://web.archive.org/web/20010712134114/http://biz.yahoo.com/fo/001026/qa_ibmxt.html |archivedate = 2001-07-12}}{{Cite web |title=IBM 5151-02 computer monitor, 1983 {{!}} Science Museum Group Collection |url=https://collection.sciencemuseumgroup.org.uk/objects/co63964/ibm-5151-02-computer-monitor-1983-monitor |access-date=2022-11-17 |website=collection.sciencemuseumgroup.org.uk |language=en}}{{Cite web |last=Farquhar |first=Dave |date=2021-08-31 |title=First generation IBM PC monitors |url=https://dfarq.homeip.net/first-generation-ibm-pc-monitors/ |access-date=2022-11-17 |website=The Silicon Underground |language=en-US}}{{Cite web |title=IBM 5151 Personal Computer Display - Peripheral - Computing History |url=http://www.computinghistory.org.uk/det/39463/IBM-5151-Personal-Computer-Display/ |access-date=2022-11-17 |website=www.computinghistory.org.uk}}{{Cite book |url=https://www.computerhistory.org/collections/catalog/102716230 |title=IBM 5151 Personal Computer monitor |date=1981}} 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.{{Cite book |url=https://www.minuszerodegrees.net/oa/OA%20-%20IBM%20Monochrome%20Display%20(5151).pdf |title=Personal Computer Hardware Reference Library - IBM Monochrome Display (5151) |publisher=IBM}} It uses TTL digital inputs through a 9-pin D-shell connector, being able to display at least three brightness levels, according to the different pin 6 and 7 signals.{{Cite web |title=minuszerodegrees.net |url=https://www.minuszerodegrees.net/mda_cga_ega/mda_cga_ega.htm |access-date=2022-11-17 |website=www.minuszerodegrees.net}} 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.

The IBM 5151 uses the P39 phosphor type, producing 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.Bottles full of nothing, by Steve Gibson, InfoWorld, 11 Jun 1984{{Cite web |last=By |date=2022-01-03 |title=Matrix Digital Rain On The IBM PC With A High Persistence Monitor |url=https://hackaday.com/2022/01/03/matrix-digital-rain-on-the-ibm-pc-with-a-high-persistence-monitor/ |access-date=2022-11-17 |website=Hackaday |language=en-US}}