[Coco] Speed up and slow down POKE

[Larry Osborne]

----- Original Message ----- 
From: "Robert Gault" <robert.gault at worldnet.att.net>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Monday, August 02, 2004 8:36 PM
Subject: Re: [Coco] Speed up and slow down POKE



> Larry Osborne wrote:

> > ----- Original Message ----- 

> > From: "Mannequin*" <mannslists at invigorated.org>

> > To: "cocomedia" <coco at maltedmedia.com>

> > Sent: Monday, August 02, 2004 6:44 PM

> > Subject: [Coco] Speed up and slow down POKE

> >

> >

> >

> >>Could someone remind me if I have the speed up and slow down POKE right

> >>for the Coco 3?

> >>

> >>Speed up:  POKE 65497,0

> >>Slow down: POKE 65495,0

> >>

> >>I think the speed up is right, but I don't think if I have the slow down

> >>one correct.

> >>

> >>Thanks.

> >>-M.

> >>

> >>-- 

> >>Coco mailing list

> >>Coco at maltedmedia.com

> >>http://five.pairlist.net/mailman/listinfo/coco

> >>

> >

> >

> > As my memory goes

> >

> > Whole memory (always works on a CoCo 3 - may fail on a CoCo 1 or CoCo 2)

> >     Speed up (double speed) POKE 65467, any digit

> >     Slow down (normal speed) POKE 65496, any digit

> >

> > Half Memory (RAM double speed -bottom half of memory; ROM normal

speed -top

> > half of memory)  ( Works on all CoCo's but of limited use on a CoCo 3)

> >     Speed up (double speed) POKE 65495, any digit

> >     Slow down (normal speed) POKE 65496, any digit

> >

> > 0 was the normal digit used but the digit had no real effect, rather it

was

> > the POKEing the location that had the effect.

> >

> > I hope this helps.

> >

> > Larry Osborne

> >

> >

> >

>

> The full fast poke will work on any Coco but you will lose video output

> when at fast speed on a Coco1. I've written several programs which use

> this poke and video returns when you drop back to normal clock speed.


True but the loss of video on the 1 likely or 2 less likey but still
possible I always regarded as a failure and on the very earliest boards of
the CoCo 1 you could get other problems especially corruption of some RAM
although that would take a while.  I didn't like to leave a programme
running at full double speed and have the video go crazy.  This was never a
problem on a 3

Incidently I just resent my original message with the necessary corrections
in the locations.

Larry

>

>

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