A86: Re: Re: OP1

To: <assembly-86@lists.ticalc.org>
Subject: A86: Re: Re: OP1
From: "Matt2000" <matt2000@gte.net>
Date: Fri, 20 Mar 1998 19:44:47 -0500
Delivered-To: assembly-86-outgoing@towerguard.unix.edu.sollentuna.se
Reply-To: assembly-86@lists.ticalc.org


How does the OP format work anyway? I do not understand how the exponenet on
the OP number is set up..how you calculate the two bytes after the first...
could you please clarify that in detail?

-Matt


>>how do i set OP1 equal to a fraction?  ld a,.25   and ld a,1/4   with
>>_SetXXOP1 dont work, and i cant fin any equates for setting them equal to
>>fractions.  do i have to do _OP2SET4, _OP1SET1, _FPDIV?  thanx for any
>help?
>
>You could do that.
>Accessing the OP1 register directly as shown below would be faster,
although
>its more code.
>
> ld hl, FPNum
> rst 20h    ; copy 10 bytes from (hl) to OP1
> ret
>
>; OP data for 2.5e-01, which is .25
>FPNum:
> .db $00, $FF, $FB, $25, $00, $00, $00, $00, $00, $00
>
>- jeremy goetsch
>

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