updated documentation, explained all similarities >3

STATUS.md

@@ -128,7 +128,7 @@ The following ROM features are currently missing:
 
 | Driver             | Status   |  Remarks                                           |
 | :----------------: | :------: | :------------------------------------------------: |
-| SD card            | PARTIAL  | work-in-progress                                   |
+| SD card            | PARTIAL  | work-in-progress, can already load files           |
 | floppy drive       | NOT DONE |                                                    |
 | ram disk           | NOT DONE |                                                    |
 

doc/Development.md

@@ -186,6 +186,8 @@ Last, but not least - the `#TAKE-HIGH` is intended to be used for BASIC routines
 
 ### MEGA65 computer-based DOS
 
+Both the internal DOS and all the IEC operations leave with CPU speed set to 1 MHz (in case of legacy compatibility mode) or 40 MHz (in case of native mode). Also the fast interrupts and badline emulation is set according to the mode.
+
 TODO
 
 ### CPU-specific optimizations

strings/0FDAA2

@@ -0,0 +1,3 @@
+part of floating point constants pi/2 and one of the sine calculation coefficients
+
+In the opriginal ROMs this sequence occurs within two floating point constants, one is a very common: PI/2. Mathematical fact, not a human creation - not copyrightable.

strings/11D029EF8D11D0AD

@@ -0,0 +1,3 @@
+$D011 + AND #$EF + STA $D011 + LDA (address not included in similarity)
+
+Simple set of instructions manipulating bits in a documented hardware register. Trivial - not copyrightable.

strings/20D0F790

@@ -0,0 +1,3 @@
+JSR $F7D0 + BCC (offset not included in similarity)
+
+Jump to a subroutine + decision based on result (Carry flag) - trivial, not copyrightable.

strings/6020D0F7

@@ -0,0 +1,3 @@
+RTS + JSR $F7D0
+
+End of a routine + a single instruction. Trivial - not copyrightable.