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- ; Program to set AMI MARK III motherboard to fast CPU speed, and
- ; enable cache.
- ; this is a .COM program, use EXE2BIN or equivalent after assembling
- ; and linking.
- ;
- code segment public
- assume cs:code, ds:code
- org 100h
- start:
- jmp begin
- cr equ 0dh
- lf equ 0ah
- port equ 460h ; index port, data port is 461h
- index equ 0bh ; register in port
- msg_fast db cr,lf,lf,'CPU set to FAST, with cache enabled.',cr,lf,'$'
- ;
- begin:
- mov dx,port
- mov al,index
- out dx,al
- jmp $+2 ; delays
- jmp $+2
- inc dx ; point to data port
- in al,dx ; and read it, from register 0bh
- or al, 00000011b ; set bits 0 and 1
- ; change above line as follows--
- ; and al,11111100b--set to slow and disable cache
- ; and al,11111101b--disable cache in fast mode (always off in slow)
- ; xor al,00000001b--toggle speed
- ; xor al,00000010b--toggle cache
- dec dx ; back to index port
- xchg al,ah ; save al
- mov al,0bh
- out dx,al
- jmp $+2
- jmp $+2
- inc dx ; and, back again to data
- xchg al,ah ; put what we want back in al
- out dx,al ; and write it where it belongs (we hope)
- mov dx,offset msg_fast ;print message
- mov ah,09
- int 21h
- mov ax,4c00h ; and go away
- int 21h
- ;
- code ends
- end start
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