71B documentation

[rprosperi]

(02-28-2015 07:34 PM)Han Wrote:  I guess I was over-simplifying the process. There are so many decompilers available for disassembling Saturn-based ROMs, and all the stable entry points are documented. There really isn't anything "unknown" about the processor that I just assumed it would be pretty easy to disassemble the ROM, and with the help of the community looking over the assembly, eventually we would figure out the algorithms. Most of them are available with a quick google search. At least, that's been my experience with the HP48 series and the HP42S.

Although there are Saturn decompilers, one key difference is there is no equivalent of the erable file with all the entry points in electronic format. They are indeed in the IDS, but that is paper or PDF only. There was a PC-based (perhaps only unix?) tool suite for the 71B from the PPC group in France. Perhaps JFG knows if this is still around somewhere?

I doubt if the Forth/Assembler ROM (even with the Debugger LEX files) would be very useful for reverse-engineering the Math ROM; JFG and Christoph would know best.