Any programs to easily set the CACR registers on the 030 CPU ?

[exxos]

Not sure such a thing exists ?

Mostly want to be able to change any bit in the register...

Really needs to be a ACC as well

EDIT:

I will try and get AI to write me one..

[alexh]

There should be lots for TT030 and Falcon030 (plus CT6x).

https://atari.8bitchip.info/GamexUsage.html
https://atari.8bitchip.info/GamexLSrc2.html

(Look for cacr in the source)

http://leonard.oxg.free.fr/articles/mul ... atari.html

Code: Select all

moveq #0,d0       ; replace #0 with whatever you want
dc.l $4e7b0002    ; this is <movec d0,cacr> encoded for assemblers without movec

[exxos]

AI wrote me some code to do it , but not tested it yet

Code: Select all

; NOIBURST.S - Disable 68030 instruction burst
; Assemble with Devpac 3: opt p=68030
; Run from desktop, then run ROM benchmark

	opt	p=68030

	pea	super_off(pc)
	move.w	#38,-(sp)	; Supexec
	trap	#14		; XBIOS
	addq.l	#6,sp

	pea	msg_off(pc)
	move.w	#9,-(sp)	; Cconws
	trap	#1		; GEMDOS
	addq.l	#6,sp

	move.w	#1,-(sp)	; Cconin - wait for key
	trap	#1
	addq.l	#2,sp

	clr.w	-(sp)		; Pterm0
	trap	#1

super_off:
	movec	cacr,d0
	bclr	#12,d0		; clear instruction burst enable
	movec	d0,cacr
	rts

msg_off:
	dc.b	"Instruction burst DISABLED",13,10
	dc.b	"Press any key...",13,10,0
	even