PROM blower PROM 74S571.

[philoupat83]

Hello.

I am working on the realization of a clone MK14T I would like to realize the programmer of 74S571 have you a return?

I intend to realize the PCB, but the plan seems wrong to me there is a mismatch of addresses:-

https://hackaday.io/project/25953-pr...rom-programmer

I found another schematic on this site may without programming

https://www.vintage-radio.net/forum/...=145663&page=3

[SiriusHardware]

Hello Philoupat83,

Most of the 74S571 ICs available on the market currently are Czech-made Tesla MH74S571 and we do not have a finished, documented project for programming those here on this site. This is as close as we have come so far:-

https://www.vintage-radio.net/forum/...d.php?t=160247

The electrical process for programming the Tesla devices is completely different from the process used for programming the National Semiconductor version, so programmers and programmer projects designed to program the DM74S571 do not work for the Tesla MH74S571.

One forum member here appears to be able to program the Tesla MH74S571 but he is very difficult to contact as he is not around most of the time.

If you just need a pair of programmed proms I would suggest emailing either this source in Czechoslovakia:

http://www.8bity.cz/kontakty/

I know that this Czech source can supply either the 'Old' OS or the 'New' OS. Unfortunately I do not know what the cost is.

Or this source in the UK.

http://jmprecision.co.uk/shopping/pg...&=SID#MOREINFO

The price is there on the page but the information does not state whether the OS in the supplied PROMs is the 'old' version or the 'new' version. Maybe if you can contact him first, you can request the version you want?

[philoupat83]

thank you for your answer I will contact
thank you again for all your comments very informative I progress thanks to you

[SiriusHardware]

I'm glad you have made progress. Please return and show us your MK14 when you have it working. Good luck!

[JohnBHanson]

How do you produce such a nice graphic of the veroboard - it is really good.

[SiriusHardware]

I believe Philoupat83 fetched that stripboard image from the article he linked to in his first post, namely

https://hackaday.io/project/25953-pr...rom-programmer

The original image is about half way down through that article. You'll probably have to direct your question to the author of the article, unless anyone here happens to recognise the artwork style?

[philoupat83]

Hello.

In fact I reactive an old project I have the Martin PCB but I wanted to compare with JM Precision I just received it
problem which switch to put I still need some pieces
martin me makes the proms and are keyboard
thank you for your encouragement I realized the pic14 of karen super subject for the study of processors a great lady thanks to her.

[SiriusHardware]

Très bon, I see a 3D-printed enclosure!

I also have a PIC14 built to Karen's design. Mine is made in a ready-made 'calculator' enclosure and uses a PIC evaluation PCB from Microchip (see images)

Karen is a forum member here, as you may have seen.

[philoupat83]

hello
thanks beautiful realisation yes I made a box 3d
I find the realisations of karen I love a good training for microprocessors
I’ll do version 2 of pic14
I compile with AS in assembler and load in pic14 with an FTDI
the project of the computer has pic16f877 of karen like me but I must finish the propjet clone MK14 before
I still have some pcbs from the project pic14 v1
with a small fault but nothing serious

[philoupat83]

https://www.thingiverse.com/thing:4298411

[SiriusHardware]

I remember now, philoupat83, you were here before I think?

I am sorry to say your link in the previous post is broken. (Error 404).

[philoupat83]

yes I’m back on forum
I’m taking over my old project
(confined)

https://www.thingiverse.com/thing:4315778

[SiriusHardware]

Did you also 3D-print your buttons? How did you put the letters, numbers, and words on the buttons?

[philoupat83]

yes in 3d
the letters A-B-C-D-E and F are inlaid and blackened with felt
the figures are not blackened
(too hard to do but I think)
term abort mem etc in mecanorma and I varnish the bomb all the buttons
visite
https://www.thingiverse.com/thing:4315778

[philoupat83]

but back to the subject of the post
what do you think of the schemat
https://hackaday.io/project/25953-pr...rom-programmer

[philoupat83]

for mk14 which button for jmp version you have a reference

[SiriusHardware]

Originally Posted by philoupat83

but back to the subject of the post
what do you think of the schemat
https://hackaday.io/project/25953-pr...rom-programmer

That schematic is designed to program the National Semiconductor DM74S571.

It can not program the Tesla MH74S571 because the programming circuit for those is different.

Your thread title does not say which 74S571 you wish to program.

[SiriusHardware]

Forum user 'Timbucus' says the switches for the JM PCB are

Multimec 3FTL6 or 3FTH9

For example, here,

https://www.digikey.co.uk/product-de...0-5-ND/4376513

You can find them for lower cost in other places.

[philoupat83]

thanks