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Hardware of the ´Sharp Mobilon HC-4500/4600´ ?

D_Lightman Page Icon Posted 2022-01-19 9:59 AM
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A late question in the 25 year history of these machines, I know

And although I´m using several of the mobilon models, I get never completely clear about its CPU.
For years I thought, it would have a "MIPS R4000" chip and I thought further, this chip would lie in a developing row with the popular "MIPS R4121 and R4131"
made by NEC.
All tools on the Mobilon 4500/4600 and the control panel too are showing the information "MIPS R4000".
But different sources of specs say, its CPU would be a "Philips PR31700".
Does anyone know something about these two Chips and their compatibility?

Thanks,
Marvin

[img]https://abload.de/img/20220119_101743_hdr8ykvu.jpg[/img]
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stingraze Page Icon Posted 2022-01-19 10:09 AM
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I checked the datasheet for Philips PR31700, and:

PR31700
32-bit RISC microprocessor


"R3000A-based PR3901 Processor Core
– RISC architecture developed by MIPS Technologies, Inc.
– Philips has added its own multiply-add and branch-likely
instructions.
– A single-cycle multiply/accumulate module to allow integrated
DSP functions, such as a software modem for
high-performance standard data and fax protocols
– Instruction cache: 4K bytes; data cache: 1K bytes
– On-chip Translation Lookaside Buffer (TLB) with 3264-bit wide
entries, each of which maps 4KByte page Max 75MHz
operation"

Datasheet here: http://datasheets.chipdb.org/Philips/PR31700.pdf

So it seems like PR31700 is a MIPS RISC CPU with additional features.
Sort of like modern ARM v - so and so that is modified like Fujitsu A64FX with additional features.

Edited by stingraze 2022-01-19 10:28 AM
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D_Lightman Page Icon Posted 2022-01-19 11:17 AM
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Wow - thanks for your efforts.

Seems to be a good and versatile chip.

But unusual that Sharp declares this in the system information as a "R4000". Must be a special internal thing of Sharp.
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Rich Hawley Page Icon Posted 2022-01-19 12:27 PM
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There were a bunch of chip manufacturers that made MIPS R4000 chips. Just like Ruffles, Lays, Great Valu, Bemo, FritoLay, Pringles all make potato chips.

Now I'm hungry ..
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D_Lightman Page Icon Posted 2022-01-21 12:43 PM
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Enjoy your meal....
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