MIL-M-80269
3.4.10.2.2.1 Flexible diskette format.
When an 8-inch flexible disk is
specified as the input media to the numerical control it shall be a single
density recording on one side using a soft-sectored format. The disk shall
be divided into 77 distinct locations on the single side disk. Tracks shall
Track 00 shall be nearest to the
be assigned numbers from 00 through 76.
edge of the disk and track 76 nearest the center. Tracks 00, 74, 75 and 76
shall not be used. There is an index hole in the jacket and the disk which
shall be used for timing functions when a beam of light passes through it.
Recording shall be accomplished by rotating the disk inside its jacket
exposing the disk at the read/write head slot cut in the jacket. Data shall
be recorded only on the side of the disk that is exposed to the read/write
head. Each track shall be divided into 26 addressable sectors which contain
128 bits. All sectors shall be identified by the file starting sector num-
The first part program shall
ber with track 00, sector 1, designated as O.
be located at sector 1E hexadecimal corresponding to track 1, sector 5.
Where two byte numbers are referenced the high order byte shall be recorded
The data stored in a sector is called a
first and the low order last.
record, Track 1, sectors 1 through 4 shall contain the program directory of
up to 16 part program names in ASCII. Each file shall be packed on the disk
in the same order as its directory entry,
Unused directory entries shall
point to the next available sector after the last file and contain the
The last sector of each file shall be
30-character ASCII space characters.
Diskette addressing
padded with end-of-file (EOF) records (8000 0000).
shall comply with the requirements of table I.
3.4.10.2.3 Manual data input.
The MCU shall have a manual data input
(MDI) feature to permit manual entry of alphabetical, numerical, and special
characters necessary for control of all programmable machine functions. The
manually input data shall be immediately displayed on the data display to
The MDI shall be capable of entering a block of
permit data verification.
data into memory upon command.
3.4.10.3 Data display. A cathode ray tube (CRT) capable of displaying at
Unless otherwise
least 250 characters simultaneously, shall be provided.
specified (see 6.2.1), the display shall, as a minimum, display the follow-
ing data:
Four digit block sequence number.
a.
Active block of stored data.
b.
Actual position of each axis.
c*
Feedrate and override condition.
d.
Control and system error messages.
e.
3.4.10.4 Control system modes of operation. The operational modes of the
CNC control shall include manual, automatic, single block, MDI, sequence
number search, and optional stop.
The maximum departure permitted by a single
3.4.10.5 Departure control.
command in either incremental or absolute mode shall be not less than plus
The control shall be capable of automatically
or minus 99.9999 inches.
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