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AutoCAD Release 9 and later, the slide file header consists of the following<br />
fields:<br />
Slide file header<br />
Field Bytes Description<br />
ID string 17 “AutoCAD Slide” CR LF ^Z NUL<br />
Type indicator 1 Currently set to 56 (decimal)<br />
Level indicator 1 Currently set to 2<br />
High X dot 2 Width of the graphics area: 1, in pixels<br />
High Y dot 2 Height of the graphics area: 1, in pixels<br />
Aspect ratio 4 Drawing area aspect ratio (horizontal size/vertical size in<br />
inches), scaled by 10,000,000. This value is always written<br />
with the least significant byte first<br />
Hardware fill 2 Either 0 or 2 (value is unimportant)<br />
Test number 2 A number (1234 hex) used to determine whether all<br />
2-byte values in the slide were written with the high-order<br />
byte first (Intel 8086-family CPUs) or the low-order byte<br />
first (Motorola 68000-family CPUs)<br />
Data records follow the header. Each data record begins with a 2-byte field<br />
whose high-order byte is the record type. The remainder of the record may<br />
be composed of 1-byte or 2-byte fields as described in the following table. To<br />
determine whether the 2-byte fields are written with the high-order byte first<br />
or the low-order byte first, examine the Test number field of the header that<br />
is described in the previous table.<br />
Slide file data records<br />
Record type<br />
(hex) Bytes Meaning Description<br />
00-7F 8 Vector The from-X coordinate for an ordinary vector.<br />
From-Y, to-X, and to-Y follow in that order as<br />
2-byte values. The from point is saved as the last<br />
point<br />
80-FA — Undefined Reserved for future use<br />
160 | Appendix A Drawing Interchange File Formats
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