On 02/08/2018 11:56 PM, Chuck Guzis via cctalk wrote: > On 02/08/2018 07:18 PM, Eric Smith via cctalk wrote: >> At some point I read an article or a transcript of an interview with an >> Intel employee (or former employee) who had been involved with the design >> of the 8085, describing how he had specified additional instructions over >> those of the 8080, and they had been implemented in the silicon, but then >> the decision was made to not document any of the new instructions other >> than RIM and SIM. >> >> I no longer recall which Intel employee that was, and can't find the >> article or interview. Does anyone else remember that, and perhaps have a >> copy? > Do you mean Cort Allen? His email a couple of years ago was: > > manofqu...@aol.com > > He wrote; > > Actually, all of these instructions were 100% tested when they were > manufactured at Intel. The test program used to test these devices > contained all of these instructions and was written to do an extensive > test on ALL instructions in many combinations and order. So, unless the > 8085 broke after it was shipped, these instructions were tested and were > working. > > I know this because I was the Test Engineer at Intel that developed the > 8085 Production Test Program. I wrote all the code for this test and it > ran on a Megatest @8000 test system. >
Also all of the competitors and second sources that made 8085s had the added instructions. The are indeed handy too. Allison