Update comments about the stack, add CBM 500 info

git-svn-id: svn://svn.cc65.org/cc65/trunk@923 b7a2c559-68d2-44c3-8de9-860c34a00d81

diff --git a/doc/internal.txt b/doc/internal.txt
index 2c2476f6ae08ec717f20979dd1bdcd0870b9567f..a5f69b08670e4aa75758873171c1d167560568fe 100644 (file)
--- a/doc/internal.txt
+++ b/doc/internal.txt
@@ -13,10 +13,8 @@ data etc are allocated on this stack, and deallocated when functions exit.
 
 The program code and data is located in low memory. The heap is located
 between the program code and the stack. The default size for the parameter
-stack is 2K, you may change this by declaring an externally visible variable
-named named _stksize that holds the new stack size:
-
-    unsigned _stksize = 4*1024;                /* Use 4K stack */
+stack is 2K, you may change this for most platforms in the linker
+configuration.
 
 Note: The size of the stack is only needed if you use the heap, or if you
 call the stack checking routine (_stkcheck) from somewhere in your program.
@@ -112,9 +110,9 @@ compiling them into assembler.  Therefore if you have a C function named
 Systems:
 --------
 
-Supported systems at this time are: C64, C128, Plus/4, CBM 600/700, the newer
-PET machines (not 2001), Atari 8bit, and the Apple ][ (thanks to Kevin Ruland,
-who did the port).
+Supported systems at this time are: C64, C128, Plus/4, CBM 500, CBM 600/700, 
+the newer PET machines (not 2001), Atari 8bit, and the Apple ][ (thanks to 
+Kevin Ruland, who did the port).
 
 C64:   The program runs in a memory configuration, where only the kernal ROM
        is enabled. The text screen is expected at the usual place ($400), so
@@ -129,6 +127,12 @@ Plus/4:    Unfortunately, the Plus/4 is not able to disable only part of it's
                has only 28K available (16K machines are detected and the amount of
        free memory is reduced to 12K).
 
+CBM 500:
+       The C program runs in bank #0 and has about 61K memory available. The
+       memory available on the CBM5x0 is slightly less than that available
+       on its bigger brothers (CBM 600/700) because the video ram is also
+       placed into bank #0 to allow sprites.
+
 CBM 600/700:
        The C program runs in a separate segment and has almost full 64K of
        memory available.
@@ -198,6 +202,6 @@ This feature is useful with inline assembly and macros. For example, a macro
 that reads a CRTC register may be written like this:
 
 #define wr(idx) (__AX__=(idx),                                 \
-               asm("\tsta\t$2000\n\tlda\t$2000\n\tldx\t#$00"), \
+                       asm("\tsta\t$2000\n\tlda\t$2000\n\tldx\t#$00"), \
                __AX__)