readtables, first pass

1 files changed, 16 insertions, 4 deletions

diff --git a/README.rst b/README.rst
index 52cd843..ebc68a0 100644
--- a/README.rst
+++ b/README.rst
@@ -16,11 +16,23 @@ designed to be used by a severely limited Scheme interpreter, which
 
 * lacks ``call/cc``, ``call-with-values``, etc
 * lacks user definable macros
-* only uses required features from R3RS
-  (except ``open-input-port``, ``close-input-port``, ``read-char``,
-   ``open-output-port``, ``close-output-port``, ``write-char``)
 * has fixnums only
 * only uses immutable strings
 * does not use "load" recursively
+* uses R3RS essental procedures only (with some exceptions)
+
+The goal is to have the compiler run under the MiniScheme in ``miniscm``
+in DOS, and then run in GLLV to compile itself.
+
+A proper implementation must have
+
+* ``open-input-port``, ``read-char``
+* ``open-output-port``, ``write-char``
+* ``cond-expand``
+* ``and``, ``or``
+* ``error``
+
+If your system supports any macro system at all, ``cond-expand``,
+``and``, and ``or`` can be implemented. ``error`` can be implemented
+as in SRFI-23 : https://srfi.schemers.org/srfi-23/srfi-23.html .
 
-The goal is to have the compiler run under MiniScheme in DOS.