Programming 2708's

[Bruce Lane]

Hi, gang,

*********** REPLY SEPARATOR  ***********

On 25-Jun-05 at 22:24 ard at p850ug1.demon.co.uk wrote:

>> 
>> I have a DataI/O model 19 and I think I have a 2708 plug-in for it.  The
>> reason that most programmers don't support the 2708 is because it
>requires
>> three voltages to operate. Come to think of it, I have a couple of old
>
>Not just that, the programming algorithm is different to most other 
>EPROMs. IIRC you have to program all locations in sequence, giving each 
>one a 1ms (IIRC) programming pulse, and repeat that 50 times. You can't 
>program odd locations like you can in later EPROMs.

	<snippety>

	Out of curiousity, I checked the support list for my UniSite system. Sure enough, it supports the 2708's. However, it won't do 2704's.

	I suspect that support for multi-voltage devices like the '08's would only be found in very old device programmers (like the Model 19), and in much later 'pin-driver' technology type systems (like the UniSite), with little or no crossover in between the high and low-end.

	Keep the peace(es).


-=-=-=-=-=-=-=-=-=-=-=-
Bruce Lane, Owner & Head Hardware Heavy,
Blue Feather Technologies -- http://www.bluefeathertech.com
kyrrin (at) bluefeathertech do/t c=o=m
"If Salvador Dali had owned a computer, would it have been equipped with surreal ports?"