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- {
- >>> How can i determine the machine's CPU clock speed from a TP
- >>> program? An 100% accurate result is not required.
-
- >> Use a counter and continually increase it. Check the clock and see how
-
- > There's a big problem : Newer CPUs are faster in executing
- > this commands and caching really speed's up the timer.
- }
-
- CONST
- Cpu8086 = 1;
- Cpu80286 = 2;
- Cpu80386 = 3;
- Cpu80486 = 4;
-
- VAR
- CPU : BYTE;
-
-
- FUNCTION CPUSpeed : BYTE; Assembler;
- Asm
- MOV DX,Cpu8086
- PUSH SP
- POP AX
- CMP SP,AX
- JNE @OUT
- MOV DX, Cpu80286
- PUSHF
-
- POP AX
- OR AX,4000h
- PUSH AX
- POPF
- PUSHF
- POP AX
- TEST AX,4000h
- JE @OUT
- MOV DX, Cpu80386
- {"DB 66h" indicates '386 extended instruction}
- DB 66h; MOV BX, SP {MOV EBX, ESP}
- DB 66h, 83h, 0E4h, 0FCh {AND ESP, FFFC}
- DB 66h; PUSHF {PUSHFD}
- DB 66h; POP AX {POP EAX}
- DB 66h; MOV CX, AX {MOV ECX, EAX}
- DB 66h, 35h, 00h
- DB 00h, 04h, 00 {XOR EAX, 00040000}
- DB 66h; PUSH AX {PUSH EAX}
-
- DB 66h; POPF {POPFD}
- DB 66h; PUSHF {PUSHFD}
- DB 66h; POP AX {POP EAX}
- DB 66h, 25h, 00h
- DB 00h, 04h, 00h {AND EAX, 00040000}
- DB 66h, 81h, 0E1h, 00h
- DB 00h, 04h, 00h {AND ECX, 00040000}
- DB 66h; CMP AX, CX {CMP EAX, ECX}
- JE @Not486
- MOV DX, Cpu80486
- @Not486:
- DB 66h; PUSH CX {PUSH EXC}
- DB 66h; POPF {POPFD}
- DB 66h; MOV SP, BX {MOV ESP, EBX}
- @Out:
- MOV AX, DX
- end;
-
-
- begin { main }
-
-
- Writeln(CPUSpeed); { 1, 2, 3, or 4 is returned; see above consts }
-
-
- end.
-