Got most of the new memory architecture roughed out.

src/c/payloads/cons.h

@@ -0,0 +1,32 @@
+/**
+ *  payloads/cons.h
+ *
+ *  A cons cell.
+ *
+ *  (c) 2026 Simon Brooke <simon@journeyman.cc>
+ *  Licensed under GPL version 2.0, or, at your option, any later version.
+ */
+
+#ifndef __psse_payloads_cons_h
+#define __psse_payloads_cons_h
+
+#include "memory/pointer.h"
+
+/**
+ * An ordinary cons cell:
+ */
+#define CONSTAG     "CNS"
+
+/**
+ * @brief A cons cell.
+ * 
+ */
+struct cons_payload {
+  /** Contents of the Address Register, naturally. */
+    struct pso_pointer car;
+  /** Contents of the Decrement Register, naturally. */
+    struct pso_pointer cdr;
+};
+
+
+#endif