(PC-1211) Multiple Dice Throw

[pyedog]

(03-20-2021 11:48 AM)SlideRule Wrote:    70: B=997B+π :B=B-INT B:C=INT 6B+1

I think this random number generator might come from page 241 of "119 Practical Programs For The TRS-80 Pocket Computer", although the book's author probably got it from somewhere else.

A very similar slightly faster version from https://www.aldweb.com/articles.php?lng=en&pg=51

Code:

R=221R + 0.2113:R=R-INT R

although I'm not sure how well distributed it winds up being.

BSD used to use something like

Code:

R=1103515245+12345 MOD 2^31

which was horrible.

I think Microsoft Windows uses (or used to use) something like

Code:

R=214013R+2531011 MOD 2^31

which seems to be slightly better.

But on a PC-1211 the BSD and Microsoft variations are significantly slower.