Re: Two friendly questions to Apple II users...

[david@uow.edu.au (David E A Wilson)]

dalloff@freenet.columbus.oh.us (Dave Althoff) writes:
>: 4) More technical: is there a microsoft signature in the code,
>: consisting of the ascii characters !FTOSORCIM (Microsoft! backwards),
>: but hidden as two floating point values after the floating point
>: constants
>: used for a polynomial (the one for computing TAN I think), that is to
>: say,
>: bits 6 and/or 7 of some bytes are inversed. One way to easily verify
>: this:
>: mask each byte with a $3F value, then add $40, and search FTOSORCIM... 

>I did a quick check of the BASIC ROM in the ROM 01 IIgs (from
>BASIC.SYSTEM).  I didn't try the byte-masking tactic, but the only
>signature bytes I found...unencoded...were "Apple ][" and "F. Bachman".  
>In the Enhanced //e, I found both "Apple ][" and "Apple //e" near the end
>of the ROM listing...in fact, in similar locations (I didn't note the
>actual byte positions).

I just did a check of the enhanced //e ROM using the and $3f or $40 idea
and did not find anything like microsoft forwards or backwards.

The Apple strings are at:

fb00- e0 45 20 ff 00 ff 03 ff 3c c1 f0 f0 ec e5 a0 dd  `E .....<Apple ]
ff00- 20 d1 c5 8d 06 c0 f0 32 d0 23 c1 f0 f0 ec e5 a0   QE..@p2P#Apple 
--
David Wilson	Dept CompSci Uni Wollongong Australia	david@cs.uow.edu.au