A couple of things . . . first of all, the WD1100 came well before the 1010 which preceded the 2010 by about a year. All the information you need about either of these chips is contained in the datasheet/appnote set published by WD for their WD100x-0x series of controllers. Careful, now, because the earlier controllers were different, i.e. the WD1000-55 came before the WD1000-05. The '-55 was the one with the WD 5-chip chipset with various designations, but accompanied by the 8X300 microcontroller. There's a 1010 on nearly every one of the early PC/XT and PC/AT controllers. The designation for one of the PC/XT controllers which was quite well documented, was WD1002-WX2. There's nothing mysterious about these controllers. They are dirt simple to program, to wit, I programmed the things myself instead of having someone else do it. The device has a "register file" which you must completely rewrite each time you issue a command and it has a buffer which you must fill before writing and empty after reading data and before checking status. The board has its own counters which trigger the operation in question once you've performed the requisite number of reads and writes. The 1015, by the way, is an 8041 (2) with Western's code in it. I have several different versions of this chip's application chipset, so it's not easy to see what's what. One thing's for sure, though, and that's that the 1010 definitely replaced the 5-chip set used on the 8X300-based controllers. The 2010 is an enhanced, error-correction-support-capable version of the 1010. It works more or less the same in other respects, but has a longer correction code which makes it capable of more than just complaining there's been an error. I'll look around to see if I have anything beyond an old data book from Western. I once kept all these devices' data sheets as though my life depended on it, which it once did, more or less, . . . at least my diet . . . , so I may actually still have them. Western abruptly quit sending out data on the chips when they went from supplier to competitor for those of us in the controller business. That was, I believe, in about 1984. Dick -----Original Message----- From: Jeffrey l Kaneko <jeff.kaneko(a)juno.com> To: Discussion re-collecting of classic computers <classiccmp(a)u.washington.edu> Date: Friday, May 07, 1999 10:26 AM Subject: WD Chipset info (Was: Listserve Traffic)