[Coco] tandy 1000 ex/hx external 720k drive to use on coco

[Bruce W. Calkins]

If I understand correctly; you need 5 volts, 12 volts (yellow and red, but I 
don't remember which is which) and two ground (black) connections for that 4 
pin connector.  Without the original power supply through the PCB that was 
probably sourced from the Tandy 1000's expansion bus you won't get far.  A 
CoCo does not have the reserves to power a drive.  You are probably best off 
looking for a standard CoCo type drive case with a built-in power supply.

Bruce W.



----- Original Message ----- 

From: "Josh Harper via Coco"

> inside the external case you have the drive it has a ribbon cable 
> connector

> and a 4 pin connector then u have a separate pcb with a small ribbon cable

> that connects to the drive and the pcb has a 4 pin power cable that 
> connects

> to the drive, the pcb then has a edge connector to connect to the computer 
> I

> disconnected both cables from the drive that are connected to the pcb and

> took the pcb xomplely out of the case


>       From: Bruce W. Calkins

>
> The 4 pin connector (many Tandy 1000's did not have one and shunted power
> through the ribbon cable.) should be the standard 3.5" floppy power
> connector. A picture and model numbers might help identify the drive. On
> the Tandy floppy drives without the 4 pin connector some of the ground 
> lines
> carried the power and traces needed to be cut and power lines tapped in.
> Not an easy project unless you are proficient reading schematics and/or
> tracing PCBs. I converted one 720k 3.5” Tandy 1000 drive about 20 years
> ago and would not bother doing another. Although 1.44M 3.5” are getting
> hard to find nowadays.
>
> Bruce W.
>
> ----- Original Message ----- 
>
> From: "Josh Harper via Coco"
>
>> I have a tandy 1000 ex/hx external 720k floppy drive that I want to
>> convert to coco use
>> ive taken out the pcb that was in the case that was hooked up to the 
>> drive
>> I have the ribbon cable to hook to the drive and the coco
>> my issue is I need to know how to get power to the drive,the power
>> connector is a 4 pin connector
>> thanks guys for all ur help


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