[Coco] RGB-DOS ROM identification

[Bob Devries]

OK, looking at a dump of the ROM, location $1938 and $1939 (D938/9 when in 
the coco) give the same value... $0188DC

Now to figure out the controller type.

--
Regards, Bob Devries, Dalby, Queensland, Australia

Isaiah 50:4 The sovereign Lord has given me
the capacity to be his spokesman,
so that I know how to help the weary.

website: http://www.home.gil.com.au/~bdevasl
my blog: http://bdevries.invigorated.org/

----- Original Message ----- 
From: "Robert Gault" <robert.gault at worldnet.att.net>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Thursday, May 14, 2009 12:17 PM
Subject: Re: [Coco] RGB-DOS ROM identification


> Bob Devries wrote:
>> Hi gang,
>> I have in my hardware collection an FD502 (26-3133) controller that has 
>> an EPROM in it that has a label with RGB-DOS $0188DC on it.
>>
>> How can I identify what kind of hard drive this was used with?
>>
>> -- 
>> Regards, Bob Devries, Dalby, Queensland, Australia
>
> The label is cryptic but the number just might be the size of the hard 
> drive in sectors or the size of the OS-9 section in sectors.
>
> PEEK the bytes $D938 (MSB) and $D939 (LSB) to get (if present) the offset 
> in 256 byte sectors to the start of the Disk Basic section of the hard 
> drive. If the value is $00000000, then the drive was used only for OS-9.
>
> The only way to get more information on the type of drive used with this 
> ROM will require disassembly of the code to see what command codes were 
> used. That might suggest the type of drive in the system the ROM 
> controlled.
>
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