[Coco] Primer on burning EPROMS?

[Christopher Barnett Fox]

Is that what I¹d need to read the ROM from a Heathkit ET-3400 trainer? The
IC is marked ³444-17² and ³6830², and I believe I see just a hint of a
Motorola logo. The trainer CPU is a Motorola 6800.

I just bought the TL866CS EEPROM burner, but I don¹t see either 444-17 or
6830 in it¹s list of supported ICs.

Christopher


On 2015/01/27/, 7:40 AM, "Daniel Campos" <daniel.campus at gmail.com> wrote:

>If anyone needs a modern EPROM programmer to burn the old 68764 / 68766
>used on the CoCo, you can go with the Transtronics Pocket Programmer 3
>USB:
>
>https://secure.transtronics.com/osc/product_info.php/cPath/55/products_id/
>621
>
>It's not cheap as those chinese programmers but can effectively burn those
>old Motorola EPROMs. I have one and works flawlessly.
>
>Daniel
>
>2015-01-27 1:13 GMT-02:00 Rogelio Perea <os9dude at gmail.com>:
>
>> 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
>>
>> --
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>> Coco at maltedmedia.com
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>>
>
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