Tweak doc/dynamic-screens.txt.

1 files changed, 16 insertions, 11 deletions

diff --git a/doc/dynamic-screens.txt b/doc/dynamic-screens.txt
index fada83e..63d2f7c 100644
--- a/doc/dynamic-screens.txt
+++ b/doc/dynamic-screens.txt
@@ -28,12 +28,16 @@ Goals:
   loads of RAM.
 
 - Able to use the extra 6.4K you get if you boot without DOS (straight
-  from the FujiNet).
+  from the FujiNet), or any space between MEMLO and $2000 (if you boot
+  a DOS with a small memory footprint). *Maybe* also include whatever
+  space there is between the end of the client's code/data and the
+  start of cc65's stack (basically, the entire "heap" area). Whether
+  or not this happens depends on how large the client code gets: if
+  it's less than 1K free, it's not really worth the trouble.
 
-- Able to use 3K of the RAM under the OS in an XL/XE machine. This would
-  be at $D800-$E3FF: the floating point pack and the font. If we could
-  think of a use for another 1K, it's available at $CC00 (the international
-  font).
+- Able to use 4K of the RAM under the OS in an XL/XE machine. 3K of this
+  would be at $D800-$E3FF: the floating point pack and the font. Another
+  1K is at $CC00 (the international font).
 
 - A *single* executable that works on all of the above (no special
   fnchatxe.xex for extended RAM), meaning it has to detect the
@@ -106,14 +110,15 @@ Free Line - a line that isn't being used by any screen. All the
   sets up the pointers in all the lines. Closing a screen releases
   all its used lines into the pool's free line list.
 
-Pool - A (possibly non-contiguous( region of memory available for lines.
+Pool - A (possibly non-contiguous) region of memory available for lines.
   Each pool has a bank number, a count of unused lines, and a linked
   list of the unused lines in the pool. Pool 0 is in main memory,
   is always at least 16K, and can be up to 26880 bytes in size (using
-  4K of under-the-OS RAM for an XL/XE, plus the space from $0700 to $2000
-  if DOS is not booted). The other pools consist of entire banks, 16K
-  apiece, one per bank. Each screen is created in one pool and cannot
-  be moved to another pool.
+  4K of under-the-OS RAM for an XL/XE, plus any space from MEMLO
+  to $2000 if DOS is not booted, or if a DOS with low MEMLO is
+  booted). The other pools consist of entire banks, 16K apiece, one
+  per bank. Each screen is created in one pool and cannot be moved to
+  another pool.
 
 Initialization:
 
@@ -340,7 +345,7 @@ just hypothetical code (final implementation may look different).
 
 /* if each pool is 16K, that's 512K, not bad. however, overhead. maybe
    limit this to something like 20 (128K extended = 16, plus the big
-   pool in main bank, plus the potential smaller pools at $0700 and
+   pool in main bank, plus the potential smaller pools at MEMLO and
    $d800. */
 #define MAX_POOLS 32