[Coco] Jumper settings needed

[Tony]

----- Original Message ----- 
From: "LinuxRules" <Linux-Rules at austin.rr.com>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Thursday, October 02, 2008 6:51 PM
Subject: Re: [Coco] Jumper settings needed


> tonym wrote:
>>> -----Original Message-----
>> I don't how much of a difference it makes, and maybe I have my models 
>> mixed up, and I can check when I get home, but I thought the M4853 was a 
>> DS/QD 80T 96TPI 720kb FDD? I believe the M4851 is the 360kb DS/DD 40T 
>> 48tpi
>>
>> The M4853 is what was used in the Tandy 2000's
>>
>> Wouldn't you have to set it up in the PC's BIOS as a 720kb FDD? It is the 
>> exact same geometry as a
>> 3.5" 720KB floppy, and that is how I set it up in my PC for doing imaging
>>
>> Tony
> Would the geometry setup cause it to select the drive, but see it as Not 
> Ready?
> I was thinking that incorrect geometry setup would simply make it 
> unreadable.
> When I setup Drive-A incorrectly in BIOS, that is what happens.
> I.E. It is still found to be "Ready", but the media cannot be 
> read..........
>
> Since last post, I found that Linux LiveCD also fails to mount the drive.
> Sure seems to be a hardware issue.....??....
>
> Aging brain cells don't work well, but I seem to remember that back in
> the "Old Days", floppy drives could be jumpered to provide "Ready"
> based on things like Head Loaded, Drive Selected, and/or Motor On,
> etc. I am suspicious that something like that is going on..........
>

I have  a Revision L and Revision U M4853 in front of me.
I KNOW I used my Rev U in a PC, as it still has a diskette inside labelled 
"MS-DOS."

On the jumper set near the FDC connector, DS1 is jumpered, and HM is 
jumpered.
Going rear (nearest connector) to front (towards front of drive) using 
binary:
01000010  1 being jumpered.

Mine also happens to have the term jumpers inserted, whic is about 1 inch 
away from edge,
about 2 inches in from the FDC connector.

Rev U and Rev L are VASTLY different on other jumpers, ie, not the jumper 
header where DS is
selected.

Tony