Disc DME: DME Disc Technical Specifications
In addition to magnetic tapes or magnetic tape discs, 8.5 1/4 and 3 1/2 inch discs can also be used for data exchange.
Disc design and specification
8 inch (IBM 3740 standard) |
51/4 inch (IBM standard MS-DOS) |
31/2 inch (IBM Standard MS-DOS) |
74 tracks 26 sectors 128 characters Records on one side Low density |
360 KB records both sides: 40 tracks per sector9 sectors per track 720 KB double density: 80 tracks per sector9 sectors per track 1.2 MB high density 80 tracks per sector15 sectors per track |
720 KB double density: 80 tracks per sector9 sectors per track 1.2 MB high density 80 tracks per sector15 sectors per track |
Available characters
From the characters available in EBCDI or ASCII codes, all upper case letters and numerical characters from 0 to 9 as well as the following special characters are permissible
Character |
8 inch (EBCDI code) Hex value |
51/4 inch & 3 1/2 inch (ASCII code) HEX value |
|
Space |
» « |
X "40" |
X "20" |
Point |
» . « |
X "4B" |
X "2E" |
Comma |
» , « |
X "6B" |
X "2C" |
ET characters |
» & « |
X "50" |
X "26" |
Hyphen |
» - « |
X "60" |
X "2D" |
Slash |
» / « |
X "61" |
X "2F" |
Plus sign |
» + « |
X "4E" |
X "2B" |
Asterisk |
» * « |
X "5C" |
X "2A" |
Dollar sign |
» $ « |
X "5B" |
X "24" |
File Design
The DME is made in the SAP system using the following tapes: A (exchange of classification keys), L/M (realty/user data), D (settlement record).
File name |
Record type |
Record length |
DTTECE |
L |
128 |
DTTECE |
M |
Section 1-3: 128 |
DTTECA |
A |
128 |
DTTECD |
D |
128 |
Detailed specification of A-Tape (Disc)
Detailed specification of L-Tape (Disc)