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Hi, J-F:
(05-20-2018 02:50 PM)J-F Garnier Wrote: [ -> ]I do also prefer the HP71, but the HP75 is an interesting machine, too.

Especially the 16kB Math module is very good, much more powerful than the HP80 series Matrix ROM.

I'd love to have a look at its

Owner's Handbook to ascertain what it does and what it doesn't do. Just for instance, I think comparing it to the

HP80 series Matrix ROM is quite unfair. The

Matrix ROM does just that, matrix handling, so it's no surprise it doesn't delve with complex suppport, integrals, or root-finding, that's simply out of its scope.

For what it does, matrices, I wonder if the

HP-75 16 Kb ROM had even a fraction of its functionality. I don't remember that it did, and that's why I'd love to see its manual. The

HP-71B Math ROM is also quite inferior in that regard, having much less functionality in its matrix capabilities as compared to the

HP80 series ROM.

Quote:It has matrix functions, complex number support (although not as nicely integrated than on the HP71), [...]

Matter of fact, the complex number support isn't integrated at all. The

HP-75 mainframe has no provision whatsoever for complex number support (unlike the

HP-71B, which does) and so there's no way to integrate it, nicely or not. I did try those capabilities at the time and found them severely lacking and awkward to use.

Quote:[...]the PROOT polynomial root finder, the Fourier Transform and more important the FNROOT and INTEGRAL functions. That is quite the same feature set than the 71.

I seriously doubt it because the

HP-71B's is a

32Kb ROM and the

HP-75C's is a

16 Kb one. I don't think that

Capricorn assembly language is 2 times more space-efficient than

Saturn assembly language so I don't think that it could fit in 16 Kb what it takes 32 Kb in the

HP-71B.

Back at the time I had an

HP-87XM fitted with the

Assembler ROM (among many others) ad 192 Kb RAM and I did tons of

Capricorn assembly language

BIN files, including a very large one implementing all kinds of matrix functionality (even

SORTing), printing utilities to speed raster graphics, CRT manipulation, the works, and I don't think the instruction set was

200% more efficient space-wise.

Quote:Or we may better say that the HP71 Math ROM included all the previous HP75 Math ROM features, adding a better integration with the mainframe (e.g. complex number) and improvements such as the re-entrant FNROOT and INTEGRAL functions.

The

Math ROM article in the

HP Journal says as much. It also says that it used the best algorithms from the

80 series Matrix ROM and enhanced versions of the

HP-15C algorithms.

Quote:And with emu75 (very similar to emu71/DOS that you know very well), the first two drawbacks mentioned above are no more relevant :-)

Thanks for your kind words but I'm pretty sure you do know

emu71/DOS better than me ... ;-D

Best regards.

V.

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Edit to correct a mistake.