
| point | A unit of length in printing and typography, used to | 
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 | specify type sizes, heights of font characters, etc. | 
| 
 | There are 72 points in a vertical inch; thus, one point | 
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 | equals 1/72 inch, or approximately 0.0138 inch. | 
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 | Some examples of point sizes are: This is 8 point type. | 
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 | This manual is printed in 10 point type. This is 14 | 
| 
 | point type. | 
| POR | Power On Reset. | 
| port | A channel used for receiving data from or | 
| 
 | transmitting data to one or more external devices. | 
| portrait | Printed parallel to the short edge of a page. | 
| Postnet | A bar code standard defined by the United States | 
| 
 | Postal Service. | 
| print mode | Synonym for print attribute. Includes character | 
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 | attributes such as italic, underlining, super/subscript, | 
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 | as well as Draft, NLQ, and DP. | 
| protocol | In general, a set of rules governing the exchange of | 
| 
 | information between computer systems. For printers, | 
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 | a protocol is the coding system used to convey and | 
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 | print characters and graphics. A printer protocol | 
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 | includes character codes, printer function codes, and | 
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 | |
| 
 | manual, protocol and emulation mean the same | 
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 | thing. See also compatibility and emulation. | 
| PSA | Printronix System Architecture. A print engine design | 
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 | that puts all data and  | 
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 | on one circuit board. The use of flash memory on this | 
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 | board permits rapid access to stored printer | 
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 | emulations and fast processing of print data. | 
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 | R | 
| RAM | |
| 
 | memory” or “working memory,” this is the active | 
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 | memory of a printer, into which programs are loaded. | 
| 
 | This memory can be read from or written to at any | 
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 | |
| 
 | termed “volatile” because whatever is in RAM is lost | 
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 | when power is turned off or interrupted. See also | 
| 
 | ROM. | 
| RD | Receive Data. Serial data stream to the printer. | 
| read | To retrieve data from memory (RAM, NVRAM) or | 
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 | mass storage (hard disk, floppy diskette, etc.). | 
| Ready mode | Online. The printer is ready to receive and process | 
| 
 | commands and data. | 
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