I've restructured the alternative version of PDP-7 Unix so that the

source code is now in src/alt. All the files in src/sys and src/cmd
are only annotated versions of the files in scans/.
The build/Makefile has been updated so that it can build the
original PDP-7 Unix or the alternative version.
Phil has fixed the Graphics-2 code, so that there is no need to
have any #ifdef code in the original kernel.

src/other/wktchrm.s

@@ -1,41 +0,0 @@
-" Alternative chrm: chrm file [file file ...]
-"
-" Unlink the named files
-
-   lac 017777			" Go to the argc
-   tad d1			" Skip past the argc
-   dac 2f			" Save pointing at cmd name, we will skip later
-   lac 017777 i			" How many arguments do we have?
-   sad d4
-     sys exit			" None, so exit
-   tad dm4			" Subtract 1
-   dac 017777 i			" and save in the argc
-
-1:
-   lac 017777 i			" Any arguments left?
-   sna
-     sys exit			" No, exit the program
-   tad dm4			" Subtract 4 from the argc and update it
-   dac 017777 i
-   lac 2f			" Move up to the next filename
-   tad d4
-   dac 2f			" and save it in the unlink arg
-   sys unlink; 2:0		" Unlink the file
-   sma
-     jmp 1b			" Loop back if the unlink was OK, or issue err
-   lac 2b			" Copy the filename pointer below
-   dac 2f
-   lac d1			" Write the filename on stdout
-   sys write; 2:0; 4
-   lac d1
-   sys write; 1f; 2		" Write " ?\n" on stdout
-   jmp 1b			" and loop back
-
-1:
-   040077;012000		" String literal " ?\n"
-dd:
-   <dd>;040040;040040;040040	" Filename dd
-d1: 1
-d4: 4
-d5: 5
-dm4: -4