On 11/23/2013 08:12 AM, Bil Herd wrote: > About an hour ago I found the binder that at one time held the HMOSII > Design Guide. http://c128.com/hmosii > > My memory is HMOSII transition was 85'ish, HMOSI was 84'ish. NMOS before > that, CMOS was a Pipedream about '86 on. We have 8501 and 8360 mit 1984 datecodes. As far as I know, '8' means HMOS-II, so at least some chips where made with it middle to end of '84. Might explain why they die so easily, MOS was still tweaking the process. > I could check but I think the real differences were effective channel > lengths and changes to the back-bias generator to create greater gate > thresholds that in theory shut of the FET's faster and drew less power per > FET. I am not sure if the backbias generator drew enough power itself so > as to offset a lot of the savings. When I compared my (still working) 7501R1 with a 8501R1, I noticed that the 7501 consumes about 20mA _less_ than the 8501 when used in the same system. It was along the lines of 85mA and 105mA. So maybe HMOS-II consumes less power, but something in the 264 design more than made up for it. Gerrit Message was sent through the cbm-hackers mailing listReceived on 2013-11-23 08:01:25
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