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AL,8 Try14 AL,1 ReadLns AL,14 Do16 AL,2 ReadLns AL,3
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Is it the 8-pixel font If not, try the 14-pixel font The 8-pixel font is table offset 1 Jump ahead to read screen lines from table Is it the 14-pixel font If not, it has to be the 16-pixel font The 14-pixel font is table offset 2 Jump ahead to read screen lines from table The 16-pixel font is table offset 3 Add font size offset to table element offset Load the screen lines value from the table and store it in the VisibleY variable Load the screen columns value to AH Exchange AH & AL for 0-basing Subtract one from column count for 0-basing Subtract one from line count for zero-basing And store 0-based X,Y word into LRXY variable
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; Finally, we calculate the size of the refresh buffer in bytes: mov AL,[VisibleY] ; We multiply screen lines time screen columns mul BYTE [VisibleX] ; times 2 (for attributes) to get buffer size shl AX,1 ; Multiply lines * columns by 2 mov [VidBufSize],AX ; Store refresh buffer size in VidBufSize ret ; Return to caller
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The first thing VidCheck does is call DispID to determine which display adapter is installed Build on your own tools there's no need to duplicate logic if you can avoid it The adapter ID code is stored in the variable DispType It's possible to use the table to look up the number of lines on the screen from the current text font size, but to do that you have to determine the font size Determining the font size is a good exercise in the use of the CMP instruction and conditional jumps Certain adapters support only one font size The MCGA has only the 16-pixel font The CGA has only the 8-pixel font The MDA has only the 14-pixel font A series of compares and jumps selects a font size based on the display adapter ID code The trickiness comes in with the EGA and VGA, which are versatile operatives capable of using more than one size of font Fortunately, BIOS has a service that reports the size in pixels of the text font currently being used, and this service is used to query the font size Whatever it turns out to be, the font size is stored in the FontSize variable in the data segment
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So far, we haven't dealt with the VidInfoTbl table at all This changes when we want to look up the string containing the English-language description of the installed display adapter There are three general steps to be taken in reading any two-level lookup table: 1 Derive the offset of the subtable from the beginning of the larger table 2 Derive the offset of the desired information within the subtable 3 Read the information from the subtable Each of the subtables is exactly 32 bytes in size To move from the start of the VidInfoTbl to a desired subtable, we multiply the index of the subtable by 32, just as we did in the previous section, in reading one single value from OriginTbl The index, here, is the display adapter ID code We multiply the index by 32 by loading it into register DI, and then shifting DI to the left by 5 bits (Shifting left by 5 bits multiplies the shifted quantity by 32) We use the form: mov CL,5 shl DI,CL because it is shorter and faster to shift by CL than to shift by using five SHL DI,1 opcodes in sequence This
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sequence is universal in that any x86 processor can execute it For the 286 and newer CPUs, you can simply shift left by 5 as an immediate operand: shl DI,5 Once you graduate to protected mode programming, you can begin using such newer opcodes with complete safety, because protected mode works only on the newer CPUs Because the display adapter description is the first item in every subtable, no offset into the subtable is necessary (The offset, if you must think of an offset, is 0) The shifted quantity in DI is added to the address of the larger table, and the sum becomes the 16-bit address to the display adapter description string This address is saved in the BordName variable At this point within VidCheck, we have the address of the VidInfoTbl table itself in BX and the offset of the desired subtable in DI Now we want to fetch the segment address of the display buffer from the middle of the subtable The segment address is at some fixed offset from the start of the subtable I say "fixed" because it never changes and will be the same regardless of which subtable is selected by the adapter ID code In the case of the segment address, the offset is 27, since the segment address is 27 bytes from the start of the subtable Expressed as a sum, the segment address is at the following offset from the start of VidInfoTbl: DI + 27 Since BX contains the offset of VidInfoTbl from the start of the data segment, we can pin down the segment address in the data segment with this sum: BX + DI + 27 Is there a way to address memory using this three-part sum There is, indeed, and it is the most complex of the numerous x86 addressing modes: Base-indexeddisplacement addressing, a term you probably can't memorize and shouldn't try Specifically to serve two-level lookup tables like this one, the CPU understands MOV statements such as the following: mov AX,[BX+DI+27] Here, the base is the address of the larger table in BX; the index is the offset of the subtable within the larger table, stored in DI; and the displacement is the fixed distance between the start of the subtable and the data we wish to address You can't just use any registers in building a memory address using based-indexed-displacement addressing The base register may be only BP or BX (Think of general-purpose register BX's hidden agenda as that of base register; the B is your memory hook) The index register may be only SI or DI These registers' names, Source Index and Destination Index, should provide you with their own memory hooks Finally, the displacement may not be a register at all, but may be only a literal value such as 27 or 14 or 3
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