AlphaOne Trackloader Vers 2004 (404 Byte) Question - Page 2

Giants · 04 October 2018, 22:58

Problem solved.
- Create a table with all data length to read
- Modify Trackloader to get the good information in this table (with D0 that indicated now the position in this table.)

Tested, work good for All my trackloader call

Code:

ASL.W #3,D0		; D0=D0*8
LEA	$2C4,A2		; A2=$2C4
ADD.L	D0,A2		; Move good position in table
MOVE.W	(A2)+,D1	; Get 'Start track'
MOVE.L	(A2),D0		; Get 'Data Length to read'

StingRay · 05 October 2018, 09:14

Make sure d0 doesn't contain any random data in the high word as otherwise your add.l d0,a2 instruction won't lead to the desired result. Also: lea $2c4.w,a2 (you need small code, you should use the smallest possible instructions).

ross · 05 October 2018, 10:43

Quote:

Originally Posted by StingRay

Make sure d0 doesn't contain any random data in the high word as otherwise your add.l d0,a2 instruction won't lead to the desired result.

Or use a mulu.w #6,d0 (that set all 32 bits) and pack your table (if eventually the extra padded .w is not used).

04 October 2018, 22:58	#21
Giants Registered User Join Date: Nov 2017 Location: france Posts: 109	Problem solved. - Create a table with all data length to read - Modify Trackloader to get the good information in this table (with D0 that indicated now the position in this table.) Tested, work good for All my trackloader call Code: ASL.W #3,D0 ; D0=D0*8 LEA $2C4,A2 ; A2=$2C4 ADD.L D0,A2 ; Move good position in table MOVE.W (A2)+,D1 ; Get 'Start track' MOVE.L (A2),D0 ; Get 'Data Length to read'

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05 October 2018, 09:14	#22
StingRay move.l #$c0ff33,throat Join Date: Dec 2005 Location: Berlin/Joymoney Posts: 6,863	Make sure d0 doesn't contain any random data in the high word as otherwise your add.l d0,a2 instruction won't lead to the desired result. Also: lea $2c4.w,a2 (you need small code, you should use the smallest possible instructions).

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