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Need to run old 8051 firmware

Chris H schrieb:

Even with several ten thousands rows of assembler that needs not be a problem. BTDT. It's a matter of structure and documentation. (I am still doing many projects completely in assembler.)

Even with C you need to access the SFRs (ports, peripherals) somehow. If these accesses are splattered across the whole sources, it doesn't matter if it's C or assembler.

Memory allocation is normally uncritical, since that is easily portable between many similar derivatives. Of course, if you previously had a device with large XRAM (being used indeed) and try to port that to a smaller chip, you'll run into problems... But again, in this case C wouldn't help you either.

Basically, the part that you can leave unchanged with C, is the same part that you can leave unchanged with assembler.

Tilmann

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Tilmann Reh
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I used this firm to port some IBM assembler to C. Their tools actually worked well, except for the self-modifying code, which tripped them up ;-) Make sure its a fixed-price contract...

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Hope that helps ! Best Regards, Dave

Reply to
Dave Nadler

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My 2 cents.

  1. The 537 comes in a 84-pin package, so finding a "modern" part with that much I/O is going to be a challenge, this was a top of the line
51-device in the late 80s
  1. It has a MUL/DIV unit to accelerate 32/16 DIV and / or 16x16 MUL, much faster than a library. The only other device I know with the same MUL/DIV unit is the C509, unfortunately that one comes in a 100 pin package and is afaik a true superset of the 80C537.

So, as pointed out, the lowest cost and by far fastest option is to find a broker. Hint: you can use the 80C517 as well because it is drop in compatible. The EA pin will always be connected for start from external memory when using a 80C537, so the 80C517 behaves EXACTLY like a 80C537 as long as the EA pin is not connected to the start from internal ROM option.

Hope this helps, An Schwob Once upon a time I was an FAE supporting the 80C5x7, I know (knew?) these devices really well ;-) If it comes down to it to re-engineer or port to a different device and you need professional help, write me an e-mail to microcontroller addgmaildotcom

Reply to
An Schwob in the USA

Yes, the 80C517/80C517A may give him enough parts, to not need much Sw effort at all...

-jg

Reply to
-jg

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