Re: A86: 5MHz
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Re: A86: 5MHz
Um, what's wrong with a stopwatch? This routine should have taken a minute
to do, and took between 1 and 2 minutes. A stop watch won't give you very
much margin for error =P
----- Original Message -----
From: <rabidcow@juno.com>
To: <assembly-86@lists.ticalc.org>
Sent: Saturday, October 16, 1999 6:46 PM
Subject: Re: A86: 5MHz
>
> how did you time it? don't even tell me you used a stopwatch! :P
>
> the oscillator in the ti86 doesn't use a crystal, so it's quite sensitive
> to battery voltage, component tolerence, and even temperature. the 6 mhz
> spec could have been calculated using exactly 6v for power and perfect
> components. reality varies greatly from perfection.
>
> -josh
>
> On Mon, 27 Dec 1999 16:15:21 -0700 "Kirk Meyer" <kirkmeyer@bigfoot.com>
> writes:
> >
> >Well, after performing a few tests. The TI-86 does not appear to run
> >at
> >6Mhz. With totally new batteries, the CPU was clocked at about 4.8MHz.
> >(With
> >older batteries it is more like 4MHz.) This was tested with a routine
> >that
> >took 360,000,000 t-states. This means one of two things.
> >
> >[A] TI is lying. I doubt this, since I don't think they make 5Mhz
> >processors. (maybe they do?) Also I doubt why TI would lie anyway.
> >
> >[B] Something is eating up that much processor time (this is with
> >interrupts
> >disabled by the way). Try the code for yourself, it's at the
> >bottom...
> >
> >Thanks to Brent, Jonah, and JBrett for helping with the tests =)
> >
> > Kirk
> >
> >.org $d748
> >
> > di
> >
> > ld b,229
> >loop1:
> > ld hl,0
> >loop2:
> > dec hl
> > ld a,h
> > or l
> > jp nz,loop2
> > djnz loop1
> >
> > ld hl,$FC00
> > ld de,$FC01
> > ld bc,$03FF
> > ld (hl),c
> > ldir
> >
> > ei
> > ret
> >
> >.end
> >
> >
>
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