HP Forum Archive 14

[ Return to Index | Top of Index ]

calculator chip list Message #1 Posted by Eric Smith on 31 Jan 2004, 5:43 p.m. A partial list of chips found in HP calculators may be found at: http://www.brouhaha.com/~eric/hpcalc/chips/

Re: calculator chip list Message #2 Posted by Bill Wiese on 31 Jan 2004, 7:50 p.m., in response to message #1 by Eric Smith Interesting... I notice that HP75 and HP85 both use Capricorn CPU?? Thought 75 was more like a 71B.. Bill

Re: calculator chip list Message #3 Posted by Veli-Pekka Nousiainen on 31 Jan 2004, 8:57 p.m., in response to message #2 by Bill Wiese "Interesting... I notice that HP75 and HP85 both use Capricorn CPU?? Thought 75 was more like a 71B.." Well they both have BASIC and plug-in ROMs and are battery operated and have HP-IL plus a Magnetic Card Reader BUT they have a totally different CPU, Firmware, OS, etc.. [VPN]

Re: calculator chip list Message #4 Posted by Jerry Pfile on 31 Jan 2004, 10:29 p.m., in response to message #3 by Veli-Pekka Nousiainen Eric, Thanks for your effort on this and the memory list. Didn't realize that the 82160a HP-IL actually had any chips in it. Thought it was just a "connector". Shows what I don't know. Didn't notice a listing for the HP-IL for the 71/75s though. (Don't have either of them) Is it a different HP-IL for these calcs? Thanks in advance, Jerry

Re: calculator chip list Message #5 Posted by Eric Smith on 1 Feb 2004, 3:39 a.m., in response to message #4 by Jerry Pfile Quote: Didn't notice a listing for the HP-IL for the 71/75s though. (Don't have either of them) Is it a different HP-IL for these calcs? The HP-75 uses a variant of the 1LB3; I'm not sure of the suffix. The HP-71B uses an HP custom microcontroller with integrated HP-IL and Saturn mailbox interfaces. I don't have the part number and it isn't in the published technical documentation. I can only think of two ways to get the part number: decap the module and hope that it's visible on the die find someone who actually worked on the development and ask I'd be delighted to learn more about the chip in the HP-71B HP-IL module, if anyone has info.

Re: calculator chip list Message #6 Posted by Vassilis Prevelakis on 31 Jan 2004, 11:56 p.m., in response to message #2 by Bill Wiese The 75C was meant to be a "handheld 85" running the same applications as its larger brother (e.g. Visicalc, Text Editor, etc). The 75 contains a CMOS version of the Capricorn processor used in the 85 and has similar memory organization. Unfortunately, if you think the 85 screen is small for spreadsheets and program editing, you will appreciate how the 1 line display of the 75 can drive you insane. The 71 is a much better all-round calculator/handheld computer, because it was designed for that role from scratch. The 75 is more like "Look honey, I shrank my HP-85" effort. This is why, generally speaking, the 71 was used for general computing while the 75 was used for more embedded-style applications where it was running a single program **vp

Re: calculator chip list Message #7 Posted by Albert on 1 Feb 2004, 12:56 p.m., in response to message #2 by Bill Wiese Additional information could be find below: http://www.chiark.greenend.org.uk/~alanb/doc/hp.txt Albert

Re: calculator chip list Message #8 Posted by Albert on 1 Feb 2004, 1:10 p.m., in response to message #2 by Bill Wiese Additional information could be found below: http://www.chiark.greenend.org.uk/~alanb/doc/hp.txt Albert

Re: calculator chip list Message #9 Posted by Vassilis Prevelakis on 31 Jan 2004, 11:47 p.m., in response to message #1 by Eric Smith Great page, congratulations for your effort. I think the use of the "Best Viewed with Any Browser" button is rather ironic as the page is not viewable with my Nestscape 4.75 browser. It complains that it can't find some style sheets. To add to the irony the WCC CSS validator link also compains about the same style sheets. **vp

Re: calculator chip list Message #10 Posted by Eric Smith on 1 Feb 2004, 3:42 a.m., in response to message #9 by Vassilis Prevelakis Quote: I think the use of the "Best Viewed with Any Browser" button is rather ironic as the page is not viewable with my Nestscape 4.75 browser. It complains that it can't find some style sheets. If being unable to fetch the style sheet keeps the browser from showing you the page, the browser is broken. Maybe the phrase should be "best viewed with any non-broken browser". Anyhow, the style sheet problem should now be fixed.

Re: calculator chip list Message #11 Posted by Victor Koechli on 2 Feb 2004, 2:46 a.m., in response to message #1 by Eric Smith Excellent list, thanks, Eric! Something I noticed: Several different CPUs are used in each of the earlier series. E.g. there are two different ACT chips in the Woodstocks (not counting the substitution of the 1820-1523 for the 1820-1396 in the HP-21), and yet another one in the HP-67/97. Three different CPUs are used in the Spices. Are these generally interchangeable, or rather not? Thanks, Victor

Re: calculator chip list Message #12 Posted by Eric Smith on 2 Feb 2004, 3:23 a.m., in response to message #11 by Victor Koechli Unfortunately, the differences between the various ACT part numbers are generally not known. I wouldn't recommend substituting an ACT in a calculator unless the new part is known to have been used in that model. And even then, it's possible that some ACTs aren't compatible with some ROM revisions, as in the HP-97 case I mentioned in another post: http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/forum.cgi?read=51048

- Message #13 Posted by Phentermine on 4 Feb 2004, 12:25 p.m., in response to message #12 by Eric Smith Erase this message and you'll never see it again. (<a href="http://www.fda-phentermine.com"> - Phentermine</a>) http://www.fda-phentermine.com 69.4106553987698

- Message #14 Posted by Phentermine on 4 Feb 2004, 12:47 p.m., in response to message #12 by Eric Smith Erase this message and you'll never see it again. (<a href="http://www.fda-phentermine.com"> - Phentermine</a>) http://www.fda-phentermine.com 76.3658664728613

Re: calculator chip list Message #15 Posted by David Smith on 2 Feb 2004, 1:29 p.m., in response to message #11 by Victor Koechli All the Woodstock ACT chips are interchangeable except the HP27 (including the 25 and 25C). Some of the Spice chips are interchangeable, but generally not... even among machines of the same type.

Re: calculator chip list Message #16 Posted by Eric Smith on 2 Feb 2004, 2:22 p.m., in response to message #15 by David Smith Quote: All the Woodstock ACT chips are interchangeable except the HP27 (including the 25 and 25C). There are subtle differences, which is why they have different part numbers. They may be mostly interchangeable, but I wouldn't count on it. For instance, it is known that there is at least one version ACT (two if you count the NMOS one in the HP-27) that will not work in the HP-67 and 97 with older ROMs. That's documented in the HP-97 service manual. (Probably in the HP-67 service manual too, but I haven't been able to get my hands on one of those.)

[ Return to Index | Top of Index ]

Go back to the main exhibit hall