[Coco] Extended Basic Upgrade Options

[Zippster]

You can also use these by NF6X.  He has them up as a shared project on OSH Park.
I’m using them for Extended BASIC in a couple of CoCo2 machines.

<http://www.nf6x.net/2013/11/version-2-of-trs-80-model-4-rom-adapter/ <http://www.nf6x.net/2013/11/version-2-of-trs-80-model-4-rom-adapter/>>
<https://oshpark.com/shared_projects/zucVSzlj <https://oshpark.com/shared_projects/zucVSzlj>>

- Ed


> On Apr 7, 2015, at 4:58 PM, Dave Philipsen <dave at davebiz.com> wrote:
> 
> If you are handy with a soldering iron and some 30 gauge connecting wire you can actually make your own adapter with a 24-pin DIP socket and a 28-pin DIP socket.  There are only a few wires that need to be re-arranged.  The majority of the pins on the 24-pin ROMs map directly to the lower 24-pins of a 28-pin socket.
> 
> I modified all of my CoCo stuff (computers and disk controllers) that way and they worked great.  All of my old CoCo stuff is gone now, though, so I can't offer you a photograph.
> 
> Dave Philipsen
> 
> On 4/7/2015 4:38 PM, Donald Akins via Coco wrote:
>> My CoCo is a 26-3134 16k Standard Basic. I ordered some 64k chips for it but needed the Extended Basic as well. Although it is tempting to order those 50pc 24 pin eProms mentioned in one of the emails I think from what I am reading here the 28 pin are more abundant and reliable. So if you can sell me a conversion kit that would be great! After that all I need to know is should I look on eBay for a inexpensive burner? Thank you, Don Akins
>> 
>> 
>>      On Monday, April 6, 2015 11:13 PM, Kip Koon <computerdoc at sc.rr.com> wrote:
>>    
>>  Hi Don,
>> I have a 24-pin rom/eprom to 28-pin 2764 eprom adapter PCB I designed that could give you the capability of using 28-pin eproms inside your Coco 2.  Is there a 26-3027 Coco 2 or is it a 26-3127 Coco 2?  If so, I have a 26-3127 I can use to check for layout correctness.  I had made it to adapt the 24 pin rom socket in my floppy controllers to accept 28 pin 2764 eproms, but until now I have not needed to use it to adapt rom sockets on CoCo motherboards.  I'm on vacation at the moment, but when I get back home Sunday, I'll check it out for you.  I can provide the Extended Basic 1.1 rom you need also.  I thought you might what to know.
>> 
>> Kip Koon
>> computerdoc at sc.rr.com
>> http://www.cocopedia.com/wiki/index.php/Kip_Koon
>>