[Coco] Access to Double Sided Disks with standard Floppy Driveson the CoCo?

[K. Pruitt]

>
> ----- Original Message ----- 
> From: "Bob Devries" To: "CoCoList for Color Computer Enthusiasts" 
> <coco at maltedmedia.com>
> Sent: Monday, April 20, 2015 8:57 PM
> Subject: Re: [Coco] Access to Double Sided Disks with standard Floppy 
> Drives on the CoCo?
>
>
>> Steve,
>> there's a drive table in the DECB ROM. It is:
>>
>> 01 02 04 40 (hexadecimal values here)
>>
>> Change to:
>>
>> 01 02 41 42
>>
>> Using the POKE command
>>
>> I can't remember the exact address, though. You can POKE the change if 
>> you have a Coco3 since that works in all-ram mode. It's a different story 
>> for Coco1 & 2.
>>
>> Hope that helps
>>
>> Regards, Bob Devries
>> Dalby, QLD, Australia
>>
>>
>> On 21/04/2015 1:54 PM, Steve Batson wrote:
>>>
>>> Anyone know of a program that lets you use the other side of a floppy as 
>>> another CoCo Drive? I used to have custom Disk Basic ROM, but that's 
>>> long gone when I sold that system. I have data on the other side of some 
>>> of my disks and don't know how to get to it. These are NOT Flippy Disks 
>>> so accessing them that way is not going to work.
>>>
>>>
>>>
>>>
>>
>> -- 
>
> I'm not sure if this is what you're looking for or not
>
>
> From "Supplement to 500 Pokes Peeks 'N Execs for the TRS-80 Color 
> Computer" Page 16:
>
> COMMAND: POKE 243,&HCC:POKE244,&H41:POKE 245,&H42:POKE 246,&HFD:POKE 
> 247,&HD7:POKE 248,&HAC:POKE 249,57:EXEC 243
>
> RESULT: Allows use of double sided disk drives
>
> REMARKS: For Disk Basic 1.0.  Drive 2 becomes the other side of Drive 0, 
> Drive 3 the other side of Drive 1
>
>
> Note: The 57 is straight from the book and is not lacking an &H.  Unless 
> the book made a mistake.  So if it doesn't work, add an &H to the 57 or 
> change it to decimal 87 and try that.
>

And here is the version for Disk Basic 1.1

POKE 243, &HCC:POKE 244,&H41:POKE 245,&H42:POKE 246,&HFD:POKE 247,&HD8:POKE 
248,&H9F:POKE &H49,57:EXEC 243

It's on the same page. I just stopped reading too quickly.