View Single Post
Old 4th Oct 2019, 5:11 pm   #3
SiriusHardware
Dekatron
 
Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 11,482
Default Re: A Simple Programmer for TESLA "MH74S-" bipolar PROMs

Quote:
Originally Posted by Station X View Post
IC Data Sheets are freely available on the internet.
Not in this case, Graham, these devices were produced in the Czech republic, possibly cold war era, and the only decent(?) datasheets about them were written in the language of that country.

They are read-mode clones of the National Semiconductor DM74S571 for which programmers and programming information are widely available, but the programming algorithm / regime for the Czech devices is quite different and there are only several currently produced high end programmers (circa £800-£1000) which directly support these very old and exotic devices.

If you have a quick glance through this now closed thread about this subject

https://www.vintage-radio.net/forum/...d.php?t=146388

...you'll see that gathering sufficient information to make a programmer for these proved to be quite a formidable task, so if circuitryboy has managed to make a breakthrough on this, I (and quite a few others here) would be very glad if he would showcase his programmer project in more detail.
SiriusHardware is offline