[Coco] Primer on burning EPROMS?

[Christopher Barnett Fox]

Thanks! About the eraser. Is that just one of the ~$20 UV light devices?
Any advantage to EPROMs over EEPROMS?



On 2015/01/26/, 10:13 PM, "Rogelio Perea" <os9dude at gmail.com> wrote:

>On Mon Jan 26 2015, Christopher Barnett Fox wrote:
>
>Wanted to try burning some EPROMs, so bought one of the inexpensive
>Chinese
>> TL866CS universal programmers off eBay, $39.99 shipped. Is there a
>>primer
>> anywhere on what else I'll need hardware-wise (e.g., a good source for
>> compatible EPROMs, suitable cartridge interface, etc.), and information
>>on
>> how to actually burn and test?
>>
>> For cartridge interface, I have an FD-501, an FD-502, and a Disto Mini
>> Controller 1.
>>
>
>The main thing while working with the CoCo is that all disk controllers
>from Tandy prior to the FD-502 have a 24 pin socket for the ROM, the chips
>that Tandy used are hard to find and if found, the programmer you have
>(and
>many other modern ones) will have a hard time working with those chips -
>bottom line you need to work with a 2764 28 pin EPROM, you can get those
>at
>Jameco (where I recently bought a couple for my ADOS explorations), other
>vendors should have them as well (Mouser, Digikey, Ebay).
>
>The 2764 can be fitted into a 24 pin socket provided you run a couple of
>jumpers and modify a couple of traces on the controller board (from the
>earliest CoCo disk controller up to the FD-501); I do not have a Disto
>Mini
>Controller but I assume it already comes ready for a 28 pin ROM, your 2764
>should just be a drop in install.
>
>The 28 pin to 24 pin adapter you can find info on the web on how to do it,
>there is an outlet that sells a ready made adapters although these are
>built in such a way that when placed on the disk controller you won't be
>able to close the case - the whole setup grows beyond the maximum
>allowable
>height inside the closed controller shell. Cloud 9 used to sell low
>profile
>adapters, check with them for availability.
>
>Last but not least, hopefully you bought an EPROM eraser. You will need
>one! :-)
>
>
>-- RP
>
>-- 
>Coco mailing list
>Coco at maltedmedia.com
>https://pairlist5.pair.net/mailman/listinfo/coco