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

[Todd Wallace]

Mark,

Will that eprom adapter fit the FD501 and still be able to close the case? Also, I think it was you I got this HDBDOS 1.2 rompak from.  If I remove eprom from that and put it in your adapter and then the FD501, will that work on a coco3 without cutting traces or soldering wires? Also, if i want both DECB 2.1 AND HDBDOS selectable, id need to send the eprom back to you to get reprogrammed right?

- Todd Wallace

On Oct 13, 2010, at 1:22 PM, Mark Marlette wrote:

> John,
> 
> Yes it will fit under the hood. Tight fit, .031" thick PCB and use machined socket pins.
> 
> With that said, it can be trying to place an EPROM with a bent pin in it. You want to go slow and don't bend. Tight tolerances = no room for slop. 
> 
> If you think that is beautiful....You need another hobby! :)
> 
> Regards,
> 
> Mark
> Cloud-9
> 
> 
> ----- Original Message -----
> From: "Little John" <sales at gimechip.com>
> To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
> Sent: Wednesday, October 13, 2010 11:19:22 AM
> Subject: Re: [Coco] Need a FD 502 controller that can accept 28 pin roms
> 
> 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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