[Techtoolslist] What's happening with old 2716/2732

[Andrew Welburn]

I have worked on hundreds and hundreds of Taito space invader pcbs over 25 years and never seen any fully blank EPROMs.

Are you sure your programmer is of sufficient current to read them properly? Some usb programmers will work with a narrow selection of 2716’s and claim compatibility with others - but they’re really not up to it.

I use a Data I/O 29b programmer, I only use a modern usb programmer for 27128 and bigger as you cannot guarantee results for devices smaller than this, usb programmers lack the current and I have seen too many people discard 2716’s determining them ‘bad’ because their usb programmer has trouble with them. I put them in the data I/o and they work fine. I’ve done a bunch of tests of this with my own TL866II+.

Andrew Welburn (mobile)

> On Oct 24, 2022, at 8:41 PM, Rodger Boots <rlboots2 at gmail.com> wrote:
> 
> I'm more surprised more Nintendo games haven't had this problem.  All it
> takes is a lack of window covers and an old-fashioned flash camera.
> 
>> On Sat, Oct 22, 2022, 8:56 PM Jose Luiz Martins <joseluizmartins at gmail.com>
>> wrote:
>> 
>> Hi folks
>> 
>> 
>> Got some old 1980's Taito boards to fix and surprise! All 2716 are blank!
>> This happened with about 5 boards and more than 40 ICs most of them are
>> 2716 but some 2732 too.
>> 
>> Do you guys is experiencing something like this?
>> 
>> 
>> Thanks!
>> 
>> JL
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