Author Topic: Programmer for TMS2516  (Read 10840 times)

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Offline edavid

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Re: Programmer for TMS2516
« Reply #50 on: July 05, 2016, 06:00:33 pm »
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.
 

Offline Kjelt

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Re: Programmer for TMS2516
« Reply #51 on: July 05, 2016, 08:43:02 pm »
So what is your experience with these eproms and how many are we talking about?
 

Offline Eheran

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Re: Programmer for TMS2516
« Reply #52 on: July 05, 2016, 09:05:33 pm »
Quote
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.

Quote
Do you have the ADC datasheet?
So far i found one ADC, Datasheet down below. Maybe you find more ADC... here is the PCB.
 

Offline edavid

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Re: Programmer for TMS2516
« Reply #53 on: July 05, 2016, 09:30:16 pm »
Interesting... did you look at the ADC input voltage?

[I mean pin 10]
« Last Edit: July 05, 2016, 10:33:13 pm by edavid »
 

Offline Eheran

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Re: Programmer for TMS2516
« Reply #54 on: July 05, 2016, 09:43:49 pm »
V+ is at 4,9V
V- is at -15V
 

Offline stj

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Re: Programmer for TMS2516
« Reply #55 on: July 06, 2016, 09:17:45 am »
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.
 

Offline rsjsouza

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Re: Programmer for TMS2516
« Reply #56 on: September 20, 2019, 02:58:02 am »
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.
Vbe - vídeo blog eletrônico http://videos.vbeletronico.com

Oh, the "whys" of the datasheets... The information is there not to be an axiomatic truth, but instead each speck of data must be slowly inhaled while carefully performing a deep search inside oneself to find the true metaphysical sense...
 

Offline psykok

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Re: Programmer for TMS2516
« Reply #57 on: June 30, 2020, 07:36:35 am »
Hi,


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


Alex
 

Offline edavid

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Re: Programmer for TMS2516
« Reply #58 on: June 30, 2020, 02:44:22 pm »
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)
 

Online greenpossum

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Re: Programmer for TMS2516
« Reply #59 on: June 30, 2020, 03:22:13 pm »
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.
 


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