Re: A86: 5MHz
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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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