MIL-B-80272
currently covered in EIA-RS-494 shall apply to the Electronic Industries
Association, IE-31 Committee on Numerical Control Systems and Equipment for
an extension of the standard codes to cover the manufacturer's features or
functions. The control shall be equipped with an 8-inch flexible diskette
reader. The reader shall have the capability to perform a cyclic redundancy
check of the input data and be capable of reading not less than 15,000 char-
acters per second.
3.4.10.2.1 Flexible diskette format. The 8-inch flexible disk for input
of BCL data 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-aide disk. Tracks shall be assigned numbers from 0 through 76.
Track 0 shall be nearest to the edge of the disk and track 76 nearest the
center. Tracks 0, 74, 75 and 76 shall not be used. There is an index hole
in the jacket and the disk that shall be used for timing functions when a
beam of light passes through it.
Recording shall be accomplished by rotat-
ing the disk inside its jacket exposing the disk at the read/write bead 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 number with track 0 sector 1, designated as 0.
The first part program shall be located at sector 1 E hexadecimal cor-
responding to track 1, sector 5. Where two-byte numbers are referenced, the
high order byte shall be recorded first and the low order last.
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 30-character ASCII
space characters. The last sector of each file shall be padded with end-of-
file (EOF) records (8000 0000).
Diskette addressing shall comply with the
requirements of table I.
3.4.10.3 Program features.
3.4.10.3.1 Tape coding. When 1-inch punched tape is the specified input
media, the control shall accept punched tape programmed in accordance with
EIA-RS-274.
The control shall be capable of recognizing and automatically
accepting coding in accordance with EIA-RS-244 or EIA-RS-358.
3.4.10.3.2 Leading zero suppression.
The control shall be capable of
suppressing leading zeros. Not applicable to BCL control.
3.4.10.3.3 Selectable inch/metric input.
The control system shall pro-
vide operator or program selectable Inch/metric input capability.
3.4.10.3.4 Absolute/incremental input. The control shall have switchable
absolute/incremental input capability. The BCL control shall not be equip-
ped with switchable absolute/incremental input.
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