[Coco] Coco Swiss Army Knife for newbees / anyone..

[Bill Pierce]

This was discussed a while back and Darren came up with a solution. Here's a copy of his reply:

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I think I may have found a way to detect a CoCo1 vs a CoCo2.  At least it worked in the very limited test of the two machines I have.  Rather than look for the SALT chip it tries to detect if the machine has the custom integrated DAC chip.

The theory is that the custom chip in the CoCo 2 does not allow
bidirectional flow through the analog switch, whereas the MC14529B used in the CoCo 1 does.  The test selects the cassette port as the audio source and then toggles the single-bit sound output while looking for a change on the cassette data input.  If the predicted change is seen then it would appear that bidirectional flow through the switch is occuring and the machine is a CoCo 1.

Should anyone care to try it and report their findings, below is the Basic program I used to perform the test:

10 POKE &HFF23,&H33
20 POKE &HFF22,&HFA
30 POKE &HFF23,&H37
40 AUDIO ON
50 POKE &HFF22,0
60 A=PEEK(&HFF20) AND 1
70 POKE &HFF22,2
80 B=PEEK(&HFF20) AND 1
90 AUDIO OFF
100 PRINT "THIS APPEARS TO BE A COCO";(A<>B)+2

Darren
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Bill Pierce
"Charlie stole the handle, and the train it won't stop going, no way to slow down!" - Ian Anderson - Jethro Tull

My Music from the Tandy/Radio Shack Color Computer 2 & 3
https://sites.google.com/site/dabarnstudio/
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-----Original Message-----
From: Gene Heskett <gheskett at shentel.net>
To: coco <coco at maltedmedia.com>
Sent: Fri, Apr 27, 2018 10:09 am
Subject: Re: [Coco] Coco Swiss Army Knife for newbees / anyone..

On Friday 27 April 2018 09:44:54 L. Curtis Boyle wrote:> The only thing I know of is to see if it can handle 57.6k drivewire> vs. only 38.4 (assuming a Coco 1 hasn’t had a chip upgrade to allow> 57.6). ;-)>> L. Curtis Boyle> curtisboyle at sasktel.net>There is a diff, but I don't after 31 years, recall the exact details, but it caused Jake Commander's chromakey (as published) to be very slow on the coco2's. Easily patched. It was the address of the keyboard polling routine contained in the first $10 bytes of the basic rom at $a000. I patched my copy of Jakes code, but I don't know now, if that patch ever made it into the wild, and my copies of old net messages to delphi were lost decades ago.. A quick dump of the first 10 bytes of the basic rom should show the diff between an un-modified 1, and an un-modified 2. I think it was with the advent of the addition of the dos command to basic.> > On Apr 26, 2018, at 11:52 PM, Barry Nelson> > <barry.nelson at amobiledevice.com> wrote:> >> > If there is software code that can tell the difference between a> > CoCo 1 and a CoCo 2 I would like to see that.> >> > --> > Coco mailing list> > Coco at maltedmedia.com> > https://pairlist5.pair.net/mailman/listinfo/coco-- Cheers, Gene Heskett--"There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order."-Ed Howdershelt (Author)Genes Web page <http://geneslinuxbox.net:6309/gene>-- Coco mailing listCoco at maltedmedia.comhttps://pairlist5.pair.net/mailman/listinfo/coco