[Coco] ROMMAX EPROM PROGRAMMER

[Joel Ewy]

coco at yourdvd.net wrote:
> I couldn't find a supported device in the rommax software that matched
> the oddball pinout of the roms in the tandy disk controllers. So I used
> a header, something like robert gault suggested earlier and adapted it
> to a 2764 footprint and the rommax was able to read it as a 2764.
> Thanks - robert
> p.s. I didn't actually need to read these ROMS - I could simply copy
> them to floppy from a coco - I was just playing with the rommax because
> it was the first one I came across digging through storage.
> I have fun with this stuff - I guess that's what it's all about -r
>
>   
That's what I'm in it for, for the most part!

JCE
>   
>> -------- Original Message --------
>> Subject: Re: [Coco] ROMMAX EPROM PROGRAMMER
>> From: Joel Ewy <jcewy at swbell.net>
>> Date: Thu, May 03, 2007 7:28 am
>> To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
>>
>> coco at yourdvd.net wrote:
>>     
>>> Anyone on the list have any experience with the eetools.com rommax
>>>       
>> eprom
>>     
>>> programmer? When I try to read a DECB 24 pin ROM as a 2764 it fails,
>>>       
>> but
>>     
>>> if I set it to 2732, it reads it, but isn't the 2732 4k and the disk
>>> basic rom 8k? I took the eprom out of my coco 2 controller (ADOS) (24
>>> pin eprom) and same thing. I am running it on a 500 Mhaz k6-2 in DOS
>>> mode (windows 98 command prompt) using the pentium version of the
>>> software. I have other programmers in storage, but to dig for them....
>>> Any assistance appreciated. - Robert
>>>
>>>
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>>>
>>>   
>>>       
>> The ROM chips used on the CoCo disk controller are indeed 8K, but in a
>> 24-pin package.  They use a different pin for the high address bit, and
>> so aren't pin-compatible with the 2764.  Hence the adaptors people have
>> to wire up in order to stick the much more common 28-pin EPROMs into a
>> CoCo disk controller.  The Disto controllers (at least the SC-1 & SC-2)
>> used 28-pin ROM sockets, and can accept the 2764.  The part number you
>> want to look for for the 24-pin 8K ROMs escapes me now, but I'm sure
>> there are others on this list who can quote it for you off the top of
>> their heads...
>>
>> JCE
>>
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>>     
>
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