[Coco] Need a FD 502 controller that can accept 28 pin roms

[Little John]

Mark's DOS adapter is probably the best way to put a 28 pin EPROM in your 
FD-501 or earlier controller. I've looked at the page and it's a beautiful 
piece of work - it's low profile makes it the best of it's kind as far as 
I'm concerned - keeps the EPROM from standing too high above the socket, so 
the controller still fits back together.

----- Original Message ----- 
From: "Mark Marlette" <mmarlette at frontiernet.net>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Wednesday, October 13, 2010 8:46 AM
Subject: Re: [Coco] Need a FD 502 controller that can accept 28 pin roms


> Todd,
>
> As others have replied. The FD501 is an 8k x ROM controller using the 
> Motorola 68766/764 type EPROM/ROM. As I have a few of these, only to 
> retain in my collectible stash, don't ask why.... :) I do have a DOS 
> Adapter module that  I make and sell. As it is a simple wiring change, it 
> always is ugly and hard to swap EPROMs. So I created the DOS Adapter.
>
> You can check it out at www.cloud9tech.com under the hardware section.
>
> If you have a 68766/764 I can program the EPROM for you for $10, includes 
> return postage.
>
> If you have a SuperIDE, just FLASH HDB-DOS into a blank DOS partition and 
> presto.........The beauty of FLASH, you did it yourself right before your 
> eyes, wanna change it, ok, do it again. Takes about 30 seconds to FLASH 
> the 8k ROM image on the SuperIDE.
>
> I have my test SuperIDE that has DECB 1.1, HDB-DOS, DriveWire3 in three of 
> the 4 DOS partitions. Change a switch or software poke the DOS you want 
> and you are off and running.
>
> In any case, good luck.
>
> Regards,
>
> Mark
> Cloud-9
>
>
>
>
> ----- Original Message -----
> From: "Todd Wallace" <dragonbytes at cox.net>
> To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
> Sent: Tuesday, October 12, 2010 11:07:38 PM
> Subject: [Coco] Need a FD 502 controller that can accept 28 pin roms
>
> Hey all,
>
> I am trying to get a floppy controller that will allow me to replace its 
> rom with my HDB-DOS rom.  The controller I have now is the FD501 but it's 
> rom is only 24 pins.  The HDBDOS eprom i have is 28 pins.  I heard the 
> FD502 has a 28pin rom socket.  Anyone got one for sale? my floppy drives 
> are FD501 also so the controller would need to be compatible with that. 
> Any help/info is appreciated.
>
> - Todd Wallace
>
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