4 ms·
Did any peer chip have a mul in the late 70s/early 80s?
by mtkd 16y ago
Did any peer chip have a mul in the late 70s/early 80s?
- jacquesm 16y ago6809 did 8x8 mul.
- pietrofmaggi 16y ago6809 was one of the first to have a mul instruction, and was used in the initial development of the macintosh: http://www.folklore.org/StoryView.py?story=Good_Earth.txt http://www.folklore.org/StoryView.py?story=Good_Earth.txt
- unwind 16y agoAwesome! In 11 clock cycle (not counting the set-up, i.e. loading the hardcoded source registers with the desired values).
- mtkd 16y agoThat's interesting, thanks, I remember writing my own on the Z80.
- Someone 16y agoI vaguely remember that at least one version of the 6502 had half a mul instruction, that is, an attempt was made to add one, but it was buggy: it only worked for some multiplicands (ones without any neighboring one bits or something like that). That made for interesting programs, where, depending on the arguments one would compute a times b, b times a, a1 times b plus a2 times b for some a1 a2