MMI 6301 PROM burning...

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asbesto's picture
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Hi,

we are trying to build a device to program the MMI 6301 PROM, because all the ROM programmers around are really too expensive! (the DATA I/O 29/something is way too expensive for us!!!)

Does someone have any information about this or maybe have tried something similar?

We found this as a starting point:

http:// www.retrotechnology.com/dri/prom_shook.html

circuitry for the required weird voltage levels to program the MMI 6301 seem not so difficult to create...

we already built a 2708 eprom reader (and almost programmer, but that's untested at the moment, it works only on our schematics Smile ) using a PIC.

Any info is appreciated! Smile

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73 de IW9HGS - Gabriele "Asbesto" Zaverio"
Director of "Museo dell'Informatica Funzionante" Computer Museum
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speedyG's picture
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Re: MMI 6301 PROM burning...

Hello again...
well instead it might be far more easy to order the ready to use set of proms from Mike Willegal....
he offers the programmed set of the apple-1 proms and most people order them together with the MIMEO
due to the fact that there is nearly no other source for that proms.....
and if the 2708 makes trouble ... well then probably you might wait till i distribute the ROMcard i have
developed.... it also will be able to program eproms....
see here for further informations at the thread:
http://www.applefritter.com/content/interest-3-expansion-cards-mimeoapple1
and here:
http://www.harrowalsh.de/Elektronik/APPLEBOX/appleboxApple1expansions.htm
sincerely speedyG

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In early days I had a lot of money but no time - now I have no money but a lot of time....
the second part includes less friends but a lot more joy on life....

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Re: MMI 6301 PROM burning...

A Data I/O 29A or 29B with a Unipak or Unipak 2 adaptor really is the way to go.

Believe me, it's far easier and cheaper in the long run than trying to make a programmer for older PROMs/EPROMs.

The 29A with Unipak will handle just about anything a vintage computer hobbyist will need, including 2708/2704 EPROMs and 6301 PROMs. About the only chips you might encounter that they don't do are 1702/1702A EPROMs

You may have to be patient but you should be able to get one for around $150 or so. Don't be put off by the outrageous prices that some vendors put on them on eBay. They never sell for those kinds of bucks. Look for realistically priced ones or those which allow a best offer and put in an offer of $150. That's how I got mine.

asbesto's picture
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Re: MMI 6301 PROM burning...

Thank you Smile Well, the idea of building one is also for teaching purpose, just to "understand" better how those PROM work, and also to involve some students here Smile

But I agree with you: the only problem is that we're in Italy and also shipping is someway expensive. We will search. A Data I/O is a real dream for us! Smile

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73 de IW9HGS - Gabriele "Asbesto" Zaverio"
Director of "Museo dell'Informatica Funzionante" Computer Museum
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Clint's picture
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Re: MMI 6301 PROM burning...

Its surprising how large the required currents are to blow them tungsten fuses !

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asbesto's picture
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Re: MMI 6301 PROM burning...

Did someone have iformations about the required procedure / voltages / current for programming? We only have part of a datasheet :/

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73 de IW9HGS - Gabriele "Asbesto" Zaverio"
Director of "Museo dell'Informatica Funzionante" Computer Museum
http://museum.freaknet.org - Palazzolo Acreide (SR) - Italy

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Re: MMI 6301 PROM burning...
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asbesto's picture
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Re: MMI 6301 PROM burning...

But those are for EPROM's, totally different stuff...

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73 de IW9HGS - Gabriele "Asbesto" Zaverio"
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speedyG's picture
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Re: MMI 6301 PROM burning...

asbesto wrote:

Did someone have iformations about the required procedure / voltages / current for programming? We only have part of a datasheet :/

Hello asbesto,
then it would be usefull to explain: do you have algorythms for burning Proms/Eproms at all?
or what are you precisely looking for....

or do you just want the complete datasheet for the MMI 6301 ?
of course there are differences between eproms and proms...
programming time at proms is shorter
programming voltages are often similar
required procedures are often similar
current is at proms often less...
and some of the links contain followups targeting to proms...
seems you want the "ready to eat dish" only...
sorry - but that will become very difficult, due to the fact that the part is obsolete....
in such case: why not contacting mike willegal by pm ?
i issued posting above that he offers programmed proms ...
- so probably it might not be wrong to guess that he has documentation....
- or is this guess that obvious ???
sincerely speedyG

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In early days I had a lot of money but no time - now I have no money but a lot of time....
the second part includes less friends but a lot more joy on life....

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Re: MMI 6301 PROM burning...

asbesto wrote:

Hi,

we are trying to build a device to program the MMI 6301 PROM, because all the ROM programmers around are really too expensive! (the DATA I/O 29/something is way too expensive for us!!!)

Does someone have any information about this or maybe have tried something similar?

We found this as a starting point:

http:// www.retrotechnology.com/dri/prom_shook.html

circuitry for the required weird voltage levels to program the MMI 6301 seem not so difficult to create...

we already built a 2708 eprom reader (and almost programmer, but that's untested at the moment, it works only on our schematics Smile ) using a PIC.

Any info is appreciated! Smile

I have a manual with schematics for the MMI Model 535 Programmer; if this is still an active thread, I can scan and post it. Dave

speedyG's picture
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Re: MMI 6301 PROM burning...

orgwood wrote:

I have a manual with schematics for the MMI Model 535 Programmer; if this is still an active thread, I can scan and post it. Dave

Hello orgwood,

first of all welcome to the community.

just to answer your question:

the moment you answer to a thread - it immediatly gets revived and also gets displayed at the left side
in the upper "active forum topics" noted ....

and of course sometimes threads are delayed by missing information - but get very fast alive again, when
information is added. So of course asbesto and a bunch of other members will be glad and gratefull to view that
manual of the programmer - even more if it contains some kind of shematic !
So please don´t hesitate to scan that manual and add a link to the place where it has been uploaded.
If you have any problem by the size of the upload - also don´t hesitate to reply and we will be glad
to assist you with tips on how to compress the data to get best results for the shematic.

sincerely
speedyG

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In early days I had a lot of money but no time - now I have no money but a lot of time....
the second part includes less friends but a lot more joy on life....

macnoyd's picture
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Re: MMI 6301 PROM burning...

On this same subject, is there a listing available (as a text file) for the 2 Monolithic Memory Proms in the Apple 1 that show a listing of address in & data out ?

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macnoyd

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Re: MMI 6301 PROM burning...

First, YES post the schematic.

I have to laugh at the OCD behavior this hobby puts us through. I too couldn't live with out MMI proms. Before I bought and burned my MMI's I bought PROMS from Mike. But after obsessing I broke down and found some MMI's. I think I bought at least three full sets of components before I was finally happy with the parts enough to solder them to the board. I'm still in the process of looking for IC's with closer date codes. Oh well...

I was this close >< to building my own programmer. I was even in the process of buying the parts. At the end of last year I built a programmer for an obscure Signetics PLD for my PDP11, just to burn one chip.

This time I decided to just bite the bullet and buy a Data I/O series 22. I actually found an Ebay seller that understood "Make an offer" and negotiated a reasonable price. For the Series 22 I still have to buy the Eprom and PLD that opened up all the algorithms.

After all that I have only used the programmer to burn 4 proms. If you want to send your PROMS to me I would gladly burn yours at no cost, you just pay shipping. PM me if you are interested.

len

p.s. I'm in the States.

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Re: MMI 6301 PROM burning...

MMI 535 PROM programmer manual and schematic- how do I upload?

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Re: MMI 6301 PROM burning...
macnoyd's picture
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Re: MMI 6301 PROM burning...

This is a question I asked (above) about 2 years ago and could not find ...
Does anyone have a HEX listing of the CONTENT of the 2 MMI 6301 chips in the Apple 1?
I have a Data I/O programmer that will burn these and would like to make a set.
Thank you in advance.

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macnoyd