Programmer for TMS2516

[edavid]

Just google for vintage computer repair, pinball repair and video arcade games repair and you find many examples of the old eproms loosing their charge, still 40 years I think is extremely good and respectable and as you say a lot keep their charge over that period.

Maybe the EPROMs on that type of board led a harder life than a set that were programmed once and then sealed inside a scale for 30 years.  It's hard to figure out how any significant UV would make it through the scale case and EPROM labels.

[Kjelt]

So what is your experience with these eproms and how many are we talking about?

[Eheran]

I don't believe OP did any fooling around with the supply voltage while reading.

I veryfied with 4.5V 5.0V and 5.5V Vcc. All identical.

Do you have the ADC datasheet?

So far i found one ADC, Datasheet down below. Maybe you find more ADC... here is the PCB.

[edavid]

Interesting... did you look at the ADC input voltage?

[I mean pin 10]

[Eheran]

V+ is at 4,9V
V- is at -15V

[stj]

if you read the eprom about 5 times and it gives the same checksum every time then it's probably good.
most eprom failures start with data being on the 0/1 freshhold so each read is a bit different.

professional programmers already do this, when you read, they do multiple reads and compare them - some also shift the voltage up and down in .5v steps.

[rsjsouza]

Sorry for the necroposting, but I noticed that the original question was not answered.

Yesterday and today I tried to program a few blank TMS2516JDL devices using my TL866CS, thoroughly erasing them with UV eraser between attempts. I can attest this programmer cannot reliably program these devices, as they use 25V programming voltage. 

I used the following parameters:
TL866CS SW version 6.85
Vpp = 21.0V
Vcc verify = 5.0V
Vdd Write = 5.0V
Pulse delay = 1000µs

I hope this helps someone in the future.

[psykok]

Hi,


I also need to program some TMS2516JDL and unfortunately  I do only own a TL866CS
Did you manage to program them ?


Alex

[edavid]

Hi,


I also need to program some TMS2516JDL and unfortunately  I do only own a TL866CS
Did you manage to program them ?

Why not use EEPROMs? (28C16)

[greenpossum]

Hi,


I also need to program some TMS2516JDL and unfortunately  I do only own a TL866CS
Did you manage to program them ?


Alex

IIRC I failed because those require 25V. I ended up using a 2816 which I have a few of fortunately.