[Coladam] Introduction and Coleco Adam Floppy Disk Drive

Frances and/or Richard Clee cleechez at tamcotec.com
Fri Mar 16 04:39:12 CET 2012

Hello John and welcome to our list. May I offer a history lesson, based 
on appearances and a vast fund of ignorance.

Back in the day, very few Adam 5-1/4 drives were produced, with 
apparently their own exclusive EPROMs keyed to the unique Adam operating 
system. These were single sided 160K units produced and assembled for 
Coleco by some Oriental outfit I don't recall. The controller board was 
poorly designed and prone to overheating, and a disc-in-place sensor was 

When Mark Gordon founded Micro Innovations and began producing Adam 
double-sided 5-1/4" discs, he bought generic double-sided 360K discs and 
mounted them on a board with firmware of his own design. A number of our 
developers have tried reading Mark's firmware but if there have been any 
successes they have not been publicized. Mark did copyright his work and 
the copyright is still alive.

My guess is that it was easier and cheaper to produce an upgraded 
generic disc drive than to try to replicate the Adam original.

But beyond that, I'll leave it to those who know what they are talking 
about to fill you in. - rich c

On 3/15/2012 7:46 PM, John Turner wrote:
> Hello. My name is John a.k.a. Big John because my son is Little John. I am a vintage hardware developer who primarily works with the Tandy Radio Shack TRS-80 Color Computer series. I have recently acquired (at quite an expense unfortunately) much Coleco Adam equipment. I have to say, I love these machines.
> The reason that I have joined this list is that I am wondering if anyone has the EPROM or EPROM image required to convert an Adam Floppy Disk Drive (FDD) to 1.44Megs? Also, are the instructions posted anywhere online. I develop hardware that I need personally and then if others are interested, then I produce a small batch. Let me know if anyone knows where I can obtain the info and eprom required for the drive conversion - Thanks - Big John
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