Address register expected

Nightfox · 11 August 2016, 23:56

Hello all

I was just wondering why my line:
move.b (d2,a0),d0
Gives "address register expected" when the setting is for 68000 but if the setting is 68010 or above it works? Does the 68010 add this addressing mode? If so is there an equivalent for the standard 68000?

Mrs Beanbag · 12 August 2016, 00:14

it should be

Code:

move.b (a0,d2),d0

i don't know why your code works anywhere. the address register should come first, and the indexing register (can be An or Dn) second.

There is no "data register indirect" addressing mode so i don't know what code it is actually generating in 68010 mode...?

Nightfox · 12 August 2016, 00:31

Ah thanks so much! I'm such a n00b

Nightfox · 12 August 2016, 00:39

It is weird though that it did work as expected in 68010 mode and above. Anyway I switched the order and now it's working great in 68000 mode. I just implemented the Insertion Sort algorithm

phx · 12 August 2016, 11:51

Quote:

Originally Posted by sacredbanana

It is weird though that it did work as expected in 68010 mode and above.

Indeed, it is. Which assembler did you use? I remember that AsmOne and/or Devpac accept swapped address and data registers in some situations.
But the 68010 definitely shouldn't be any different to the 68000. The supported instructions and addressing modes are exactly the same.

11 August 2016, 23:56	#1
Nightfox Registered User Join Date: Apr 2016 Location: Perth, Australia Posts: 398	Address register expected Hello all I was just wondering why my line: move.b (d2,a0),d0 Gives "address register expected" when the setting is for 68000 but if the setting is 68010 or above it works? Does the 68010 add this addressing mode? If so is there an equivalent for the standard 68000?

12 August 2016, 00:14	#2
Mrs Beanbag Glastonbridge Software Join Date: Jan 2012 Location: Edinburgh/Scotland Posts: 2,243	it should be Code: move.b (a0,d2),d0 i don't know why your code works anywhere. the address register should come first, and the indexing register (can be An or Dn) second. There is no "data register indirect" addressing mode so i don't know what code it is actually generating in 68010 mode...?

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12 August 2016, 00:31	#3
Nightfox Registered User Join Date: Apr 2016 Location: Perth, Australia Posts: 398	Ah thanks so much! I'm such a n00b

12 August 2016, 00:39	#4
Nightfox Registered User Join Date: Apr 2016 Location: Perth, Australia Posts: 398	It is weird though that it did work as expected in 68010 mode and above. Anyway I switched the order and now it's working great in 68000 mode. I just implemented the Insertion Sort algorithm

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