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PPD

   Also found in: Medical, Acronyms, Wikipedia 0.06 sec.

PPD

(1) (Parallel Presence Detect) The method used by earlier SIMM memory modules to communicate their capacity to the computer. A binary number coming from a parallel set of pins was read by the system, with each pin representing one bit. Contrast with SPD.

(2) (PostScript Printer Description) See PPD file.


PPD - Parallel Presence Detect


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SDK has also succeeded, using the Hybrid PPD process, in developing blue LEDs with the highest-level brightness on the market today.
Nine patients had a positive PPD test, and 2 had previously been vaccinated with BCG, and they did not undergo PPD testing.
Nobody saw that negative PPD coming (last spring)," he stresses.
 
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