Re: Tesla MH74S571 programming.
Thanks for the binaries. I own an issue V and they are still called IC2 and IC3 ;-) See the pictures.
Standards and former Eastern Europe... it might have been a bad combination ;-) Indeed I think that all 74's should be equal, but I have heard earlier of slight differences. Back in the day, standards must have been terrible looking at all variant of the 2708 EPROMs.
For the programming specs... I'll see what I can dig up? Did anyone ask Martin? I wanted to attach a revamped version of the datasheet parts I had found, but I'm not able to upload it (although it is only 2.2Mb or something). Revamped them a bit so at least all pages have the same size.
Another interesting thing is the use of the 74L86 which cannot be replaced with a 74LS86 as these are not pin compatible. Has nothing to do with different manufacturers, but still quite confusing.
That is an interesting remark, about all connections defaulting to 0 rather than 1... That would suggest a completely different setup/technology was used.
We will get there (but it might take some time)...
|