A86: Re: Re: Re: Add hl,a

To: <assembly-86@lists.ticalc.org>
Subject: A86: Re: Re: Re: Add hl,a
From: "David Phillips" <electrum@tfs.net>
Date: Thu, 29 Oct 1998 19:56:13 -0600
Delivered-To: assembly-86-outgoing@towerguard.unix.edu.sollentuna.se
Reply-To: assembly-86@lists.ticalc.org


Hmm, that's useful, I didn't think of using RET NC like that.  Good time
considering it's a routine:

add_hl_a:    ; 17 (for call)
 add a,l     ; 4
 ld l,a      ; 4
 ret nc      ; 11 or 5    = 36
 inc h       ; 4
 ret         ; 10         = 44

-----Original Message-----
From: Dux Gregis <assets@eden.rutgers.edu>
To: assembly-86@lists.ticalc.org <assembly-86@lists.ticalc.org>
Date: Thursday, October 29, 1998 7:50 PM
Subject: A86: Re: Re: Add hl,a


>
>What I usually do (because it comes up a lot) is define a call _add_hl_a
>that looks like this:
>
>add_hl_a:
> add a,l
> ld l,a
> ret nc
> inc h
> ret
>
>
>>
>>For constants:
>> ld a,l      ; 4
>> add a,N     ; 7       N is the constant
>> ld l,a      ; 4
>> jp nc,skip  ; 10 or 1
>> inc h       ; 4
>>skip:        ; = 20 or 29
>>
>>For A:
>> add a,l     ; 4
>> ld l,a      ; 4
>> jp nc,skip  ; 10 or 1
>> inc h       ; 4
>>skip:        ; = 13 or 22
>>
>>If you can trash DE (or BE):
>> ld d,0      ; 7
>> ld e,a      ; 4 (or 7, if you load it with N)
>> add hl,de   ; 11
>>             ; = 22 for A, 25 for constants
>>
>>
>>-----Original Message-----
>>From: InFuZeD <zoneti@home.com>
>>To: assembly-86@lists.ticalc.org <assembly-86@lists.ticalc.org>
>>Date: Thursday, October 29, 1998 3:30 PM
>>Subject: A86: Add hl,a
>>
>>
>>>
>>>How could I add a to hl? Is it a call? I actually need to use it to add
>>>hl by $10 or 122. It's for a super small putsprite.
>>>
>>>-InFuZeD
>>

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