Author: Gerd Isenberg
Date: 13:04:55 09/27/05
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On September 27, 2005 at 00:22:55, Carey wrote: >On September 26, 2005 at 16:58:09, Gerd Isenberg wrote: > >>On September 26, 2005 at 13:57:23, Gerd Isenberg wrote: >> >>>> >>>>The Matchbox CPU (zelfbouw 6809), a 16-bit one. > >>Really a fascinating CPU, a 8/16 bit hybrid, >>with sex, Sign extend B into A. > >Yup... The 6809 used to easly outperform 6502's running at twice the speed. > >The SEX instruction was always amusing to tell about.... But it was, >unfortunately, a very boring instrunction. Why is SEX boring ;-? Doesn't it combine a lda and arithmetic shift right 8 instruction? I guess because of the fixed register a,b association. Btw. is the BIT-instruction similar to x86 bt- or to test-instruction? 6809 has tst-instruction as well, but no idea wehther it performs a temporary and. Gerd
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