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16c 68 bit Index register???



#2

This is an open question on comp.sys.hp48, but I figured someone here would know. The 16c manual says that the Index register is always 68 bits regardless of the word size. Should it say 56 bits, or is there a reason for 68 bits? Thanks,

Steve


#3

Hi;

it's been the subject of one thread a couple of months ago (begining of this year). It's a fact and there is no "know" way to access the four MSB's, unless you allow the calculator to count up over (264-1). This could be a test. Set 64 as WSIZE, store FFFF FFFF FFFF FFFF16 in RI and write a program with ISZ GTO x, etc. and verify it it jumps to x in the next count. RI contets will return 0 but internaly it will be 1 0000 0000 0000 000016, so it should not jump until it passes through F FFFF FFFF FFFF FFFF16 and back to 0 0000 0000 0000 000016, what gives us 268 - 264 cycles.

Wow! Is it correct? Gee...

Best regards.

Luiz C. Vieira - Brazil


#4

Luiz wrote:

> it's been the subject of one thread a couple of months ago

Wouldn't you love a way to search all the forum archives at once?

Jordi Hidalgo

HPCC #1046


#5

...because I offered myself to organize them in subjects and I tried, I swear I tried. I have already began, and I "talked" to Dave about this. He sent me all information I needed and I started at the moment I got the data. I had a 8MBytes text with almost all posts I found about Voyagers, having any mention, in all Forum database available at that time and I overwrote the file for a new, 80KBytes fresh, empty new text... I got to bed and tried not to think about it. I'm organizing them again, but my time is somewhat shorter for these days. I promisse I'll post news about this subject as they make any difference.

Thank you.

Luiz C. Vieira - Brazil


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