Post by
deviousKA »
https://forums.nicoclub.com/deviouska-u9381.html
Sun Jun 29, 2008 8:16 pm
The problem the willem has with programming some eeproms is the necessary high voltages (like 12.5v for some chips?). The actual address and data line functions do work well, so long as the the parallel port is setup properly.
The nvsrams do not require any special voltages for erasing/programming. Simply power up the chip (5v) and write the data, power it down and done.
From my experience and the feedback I have gotten from others is that just about every willem version will do the nvsram chips without error. Personally I use the willem enhanced, which seems to be obsolete now, but I have heard from a user that the dual-power version programs the 16c88 without problem (I know there are all kinds of versions now, so I cannot offer an exact recommendation).
People seem to have a lot of problems with the willem programmers when trying to program the SST 27sf512. Back in the day when everyone used to use the atmel at29c256 instead, there were very few problems. I wouldnt let 27sf512 experience sway you so much when (re) purchasing a willem programmer, for the price it cannot be beat, it can program a lot of different types of chips and microcontrollers. From my experience the 27sf512 is the most troublesome.
Ill get back with you on the example adapter board, need to borrow a camera. I actually designed the adaptation about 3-4yrs ago, but have only recently deciphered and re-written the code to make use of it. All of my pictures/info on the board are that old, so updates are in order.