[ale] EPROM programmer?

[Steve Tynor]

Raj, Jeff (x2), SpaXpert --

Thanks for the suggestions.  I tried cleaning the EPROM contacts with 
contact cleaner and reseating - didn't help.  These are part of an 
add-on "daughter board", that fits into the original EPROM sockets on 
the motherboard.  Conventional wisdom is that reseating the daughter 
board is sometimes helpful, so I pulled the board, sprayed contact 
cleaner on both the daughter board headers and the original motherboard 
sockets and... now the synth is completely unresponsive.   Will probably 
have to pull the daughter board out again and re-check that it's fully 
connected to the motherboard.

But for now, I'm taking a deep breath and letting it sit for a while...


(and yes, 2765 was a typo.  it uses 2764 or 2864's).


Steve


On 3/24/20 11:17 PM, Raj Wurttemberg via Ale wrote:
> Haha... Boris called me out. :)  I do have a GQ-4x4 EPROM programmer that I use for my Commodore hacking.
>
> This is what the programmer looks like:
> http://www.mcumall.com/comersus/store/comersus_viewItem.asp?idProduct=4312
>
> Here is a list of supported chips:
> http://www.mcumall.com/comersus/store/mcumall_TrueUSBWillemsupportICs.asp
>
> I think that the chips you mentioned below might really be a 2764 (the '64' represents 64k bits) for the EPROM and a 2864 for the EEPROM.
>
> As someone mentioned earlier, the EPROMs don't usually go bad. If I suspect a bad EPROM, I usually just use the verify feature to compare the EPROM to a BIN.
>
> I'm happy to do a compare for you if you want.  I can't find my UV eraser anywhere... I'm going to have to buy a new one.
>
> I never got a chance to meet up with Boris... With 11-yo triplets, my time is extremely limited these days.  I figure when they go off to college, I'll have some spare time. Haha!
>
> Thanks,
> /Raj
>
> -----Original Message-----
> From: Ale <ale-bounces at ale.org> On Behalf Of Steve Tynor via Ale
> Sent: Tuesday, March 24, 2020 7:45 PM
> To: Atlanta Linux Enthusiasts <ale at ale.org>
> Subject: [ale] EPROM programmer?
>
> I delurk to ask a non-Linux, but hardware hacker oriented question...
>
> I'm restoring a vintage synthesizer (a DK Synergy) which I had put into
> what I thought would be temporary hibernation, but turned into 20 years
> of storage.
>
> It mostly works, but testing suggests that at least one of the EPROMs
> has degraded and needs to be replaced.  As long as I'm at it I'd like to
> replace all four (I'm told that I can use either 2765 UV erasable or
> 2864 electrically erasable EPROM's)
>
> I have binary images (BIN files) for each of the EPROMs, but no way to
> program them.
>
> Can anyone on the list help?   My only other thought is to seek out the
> various local "makerspaces".
>
> Thanks!
> Steve
>
>
>
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