I am wondering if the 2716 devices i have are very old and very slow and therefore too slow for the s4 to read correctly so its reading them too fast and therefore wrongly on the lower data lines. It seems the S4 is reading the first character correctly, but not the second on most times so the checksum feature is reading fineīut if i put these D2716 devices in the S4 and do a compare with memory this is what i get If i do a checksum on both the D2716 and the first half of the 2732 it is identical (1E513). If i program a 2732 and set the S4 device to be 2716 it reads fine and correctly as a 2716 no problem, so i am sure the S4 is not faulty in its operation Thanks for your reply, i have done a little more research and this is what i have foundĪll other types of eprom program/verify fine on the S4 (2732, 2764, 27256 and biger types) I know these are old eproms but the reason for needing to program such old eproms is they are direct replacements for duff ones i have in a old 1978 space invaders machine and it would be nice for the s4 to do them rather than having to set up the old faithfull bbc B and equipment I am just puzzled on why i cannot get the s4 to make sense of these old eproms to program when a extreamly old bbc b with eprom programmer works fine with no problems
#DATAMAN EPROM PROGRAMMER PC#
I have tried several different read processes on the 2716 using different manafactures and still no joy i know this is a really really old type of eprom but i seem to be having a few problems with the s4 on them, I have tried the s4 8 bit eprom v3.00 and s4 16 bit eprom v1.22 lib's with no luck i believe the D2716 is a nec eprom but the s4 refuses to say its blank even when a old bbc b pc and watfords electronics eprom programmer says it is and. Now here is the funny bit, if i then put the eprom back into the s4 and do a checksum it matches the bbc b checksum! but if i examine the data on the s4 it reads totally different to what is actually in the eprom The old bbc b works fine and programs the eprom well and a checksum.
So i know the eprom is blank, but the s4 using the test button to see if its blank it says every location has data in it, when trying to program it still wont program it saying every location has different data on the verify process I believe the D2716 is a nec eprom but the s4 refuses to say its blank even when a old bbc b pc and watfords electronics eprom programmer says it is and this is just on one standard 2716 setting that it has!
I know this is a really really old type of eprom but i seem to be having a few problems with the s4 on them, I have tried the s4 8 bit eprom v3.00 and s4 16 bit eprom v1.22 lib's with no luck
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