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Description

registers is the type identifier for a built-in variant record type, which is used to store the x86 processor registers before and after calls to the built-in procedures intr and msdos.

The record layout is given below:

regtype = (byteregs, wordregs)

registers =  record
         case regtype of
         byteregs : ( al, ah, afill1, afill2 : byte;
                  bl, bh, bfill1, bfill2 : byte;
                  cl, ch, cfill1, cfill2 : byte;
                  dl, dh, dfill1, dfill2 : byte;
                );
         wordregs : eax, ebx, ecx, edx, esi, edi, cflag : word;
         end;

Example

The simple program below clears the screen by using the built-in procedure intr to call the BIOS INT $10 interrupt.

program cls;
var
   regs : registers;
begin
   fill(regs, 0);
   regs.eax := $0002;
   intr($10, regs)
end.

Portability

Operating Systems: All
Standard Pascal: No