IBM AT 5170 Technical Reference page 462

fixed disk drive. In the IBM Personal Computer, a unit
consisting of nonremovable magnetic disks, and a device for
storing data on and retrieving data from the disks.
flag. (1) Any of various types of indicators used for
identification. (2) A character that signals the occurrence of
some condition, such as the end of a word. (3) Deprecated term
for mark.
flexible disk. Synonym for diskette.
flip-flop. A circuit or device containing active elements, capable
of assuming either one of two stable states at a given time.
font. A family or assortment of characters of a given size and
style; for example, 10 point Press Roman medium.
foreground.
(1)
In mUltiprogramming, the environment in which
high-priority programs are executed. (2) On a color display
screen, the characters as opposed to the background.
form feed.
(1)
Paper movement used to bring an assigned part
of a form to the printing position. (2) In word processing, a
function that advances the typing position to the same character
position on a predetermined line of the next form or page.
form feed character. A control character that causes the print or
display position to move to the next predetermined first line on
the next form, the next page, or the equivalent.
format. The arrangement or layout of data on a data medium.
FPLS. Field-programmable logic sequencer.
frame. (1) In SDLC, the vehicle for every command, every
response, and all information that is transmitted using SDLC
procedures. Each frame begins and ends with a flag. (2) In data
transmission, the sequence of contiguous bits bracketed by and
~
including beginning and ending flag sequences.
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