[Coco] Extended Basic Upgrade Options

[Dave Philipsen]

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
>
>
>> -----Original Message-----
>> From: Coco [mailto:coco-bounces at maltedmedia.com] On Behalf Of Donald Akins via Coco
>> Sent: Monday, April 06, 2015 7:33 PM
>> To: CoCoList for Color Computer Enthusiasts
>> Cc: Donald Akins
>> Subject: Re: [Coco] Extended Basic Upgrade Options
>>
>> Yeah I was looking for the 1.1 version. If burning an eProm is my only option where could I purchase the eProm chip I need and what
>> would you recommend for a burner? I don't want to spend to much on a burner so my options are limited.
>>
>>
>>
>>        On Monday, April 6, 2015 7:15 PM, Joe Grubbs <jsgrubbs at hotmail.com> wrote:
>>
>>
>>    I have an original ECB 1.0 ROM that I could sell, but I think you ought to go for 1.1 since that was what came in the 26-3027 (CoCo2
>> 16k ECB). I think the bin files are on colorcomputerarchive.com. It's just a matter of burning that onto a clean ROM chip
>>
>>
>>
>> --- Original Message ---
>>
>> From: "Donald Akins via Coco" <coco at maltedmedia.com>
>> Sent: April 6, 2015 7:04 PM
>> To: coco at maltedmedia.com
>> Cc: "Donald Akins" <dakins089 at yahoo.com>
>> Subject: [Coco] Extended Basic Upgrade Options
>>
>> Hi Everyone,
>> I am new to the CoCo maling list and I was hoping one of you guys can point me in the right direction for upgrading my CoCo 2. I
>> recently acquired a 16k Standard Basic but I want to upgrade it to Extended Basic. Is there some place that sells them or are there
>> eProm options I should be looking into. If your answer is eProm perhaps you can guide me on the best approach there. My board has
>> a 24 pin socket. Thank you, Don Akins
>>
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>