FWIW my Data I/O 2900 programs the KR556RT2 fine as a Philips 82S100. On Tue, Jul 14, 2020 at 5:02 AM dave_m <dmercado11_at_att.net> wrote: > > I just received a few clones of the 82S100 from Russia on ebay. They are > marked KR556RT2 and appear to be in a fresh DIP package. I ordered them at > the end of April and they arrived in early July. $29 plus $10 shipping for > nine units. > > I used WINCupl with target device "f100" to develop a JEDEC file and used > WINSim to add some test vectors. > > I attempted to program the chip using a DataI/O Model 29B with a LogicPak > and the proper programming adapter 303A-001 for the Signetics 82S100. I used > this setup before with real 82S100 or Philips PLS100 chips with no issues. > > The JEDEC loaded into the DataI/O with the proper sum check, but when I > tried to fuse the part, I received an immediate Error 21 which is 'Illegal > Bit'. The description of the error states that it is not possible to program > the device due to already programmed locations of incorrect polarity. A > second chip had the same result. > > I assume these chips have been previously programmed or are fakes. > > > > > > -- > Sent from: http://cbm-hackers.2304266.n4.nabble.com/ >Received on 2020-07-14 10:00:02
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