[Coco] Primer on burning EPROMS?

[Stephen H. Fischer]

You can tell an EPROM eraser by the fact that the florescent tube is clear. If you look at it when it is on you are in danger of hurting your eyes. (Short wave UV)

> UV light devices?

The tubes in these look almost black or violet. They are safe to look at. Will not erase EPROMs. (Long Wave UV)

Otherwise they both fit into the same lamps as the white tubes. But you must protect your eyes with a cover.

My EPROM eraser tube is labeled G8T5, purchased ~ 35 - 40 years ago.

Try Googling "fluorescent tube G8T5" or "Germicidal Tube Lamp"

SHF

P.S. If you are at high altitude, just put the EPROMs out in the Sun on a clear day. It does take a long time.

> 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.

The 6830 ROM may be too old or too small to be supported.

----- Original Message ----- 
From: "Christopher Barnett Fox" <cbfox01 at syr.edu>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Tuesday, January 27, 2015 7:52 AM
Subject: Re: [Coco] Primer on burning EPROMS?


> 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
> 
> 
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