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Graphics Interchange Format  |  1998-10-01  |  30KB  |  392x344  |  4-bit (16 colors)
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OCR: FIGURE 3 Format of a call gate descriptor (a). A call gate contains a selector to an exe- cutable code descriptor (which provides a base address) and an offset. The offser is added to the base address to access a system service (b) 16 OFFSET 131 .. 16] P DPL 1- 01 TO0 .000. .. COUNT SELECTOR OFFSET 1530) P = Preset DPL - Descriptor Privilege Level call sector, Ci Jo0000h Cull Cate Offset System Service Code Base Address