[ASM] How to ld hl,sp?

Timendus · Post by **Timendus** » Thu 06 Dec, 2007 9:09 am

I want to get the stack pointer. How do I do that? There's a ld sp,hl opcode according to WikiTi, but not the other way around...

Post by **qarnos** » Thu 06 Dec, 2007 9:36 am

Timendus wrote:I want to get the stack pointer. How do I do that? There's a ld sp,hl opcode according to WikiTi, but not the other way around...

Code: Select all

ld hl, 0
add hl, sp

If you just want to store SP somewhere, there is also:

Code: Select all

ld (somewhere), sp

...muck with sp...

ld sp, (somewhere)

Timendus · Post by **Timendus** » Thu 06 Dec, 2007 10:09 am

Really? Why aren't those opcodes in the WikiTi?

Thanks!

Edit: Never mind, really stupid question

Q 16-bit register: bc, de, hl/ix/iy, sp

Post by **benryves** » Thu 06 Dec, 2007 11:06 am

Timendus wrote:Really? Why aren't those opcodes in the WikiTi?

There's always the Z80 User Manual if you want another reference.

(Edit: Hm, didn't realise WikiTI had anything about the Z80 on it at all).

CoBB · Post by **CoBB** » Thu 06 Dec, 2007 11:16 am

Timendus wrote:Edit: Never mind, really stupid question
Q 16-bit register: bc, de, hl/ix/iy, sp

Sorry about the obscure indirections in the reference, it’s to make sure that only people who understand pointers will make use of it.

Timendus · Post by **Timendus** » Thu 06 Dec, 2007 11:17 am

I guess we should be grateful for that

Anyway, it's working. See mailinglist for details.

Liazon · Post by **Liazon** » Thu 06 Dec, 2007 10:59 pm

or ASMin28's list of instructions is useful.

Timendus · Post by **Timendus** » Thu 06 Dec, 2007 11:41 pm

I usually just Google for a random z80 opcode reference when I need one, but this time I happened to be on WikiTi...

Post by **tr1p1ea** » Fri 07 Dec, 2007 3:29 am

I keep this one close by: http://www.ticalc.org/archives/files/fi ... 12883.html

.

Post by **qarnos** » Fri 07 Dec, 2007 5:54 am

And don't forget Thomas Scherrers Z80 support page. Tons of info there.

Post by **qarnos** » Fri 07 Dec, 2007 7:33 am

tr1p1ea wrote:I keep this one close by: http://www.ticalc.org/archives/files/fi ... 12883.html

.

Why is it that this doc and asmguru both list the conditional JP instructions as taking 1 T-State when the jump is not taken?

My guess is that one of them left off the "0" and the other copied the mistake.

Jim e · Post by **Jim e** » Fri 07 Dec, 2007 11:20 am

That one on ticalc is really bad. Tabulation cropped off the last digit on a lot of opcodes.

Post by **tr1p1ea** » Sat 08 Dec, 2007 12:48 pm

I have noticed a few mistakes, but i wouldnt say its a terrible reference. Certainly helped me out

.

Another one i find handy is: http://www.geocities.com/SiliconValley/ ... 0_home.htm

calc84maniac · Post by **calc84maniac** » Wed 26 Dec, 2007 7:28 am

Heh, might as well post mine too. It's concise and to the point, holds most z80 command info you'll ever need (and more), and easily printable on one page.
calc84maniac's z80 reference

MaxCoderz

[ASM] How to ld hl,sp?

[ASM] How to ld hl,sp?

Re: [ASM] How to ld hl,sp?