screen and input spec

3 files changed, 14 insertions, 0 deletions

diff --git a/samples/input.orgaasm b/samples/input.orgaasm
new file mode 100644
index 0000000..a97f70c
--- /dev/null
+++ b/samples/input.orgaasm
@@ -0,0 +1,4 @@
+  SLP
+@loop
+  LIT ,Input LDA DBG POP
+  JMP ,loop
diff --git a/spec.md b/spec.md
index 19678d4..9559004 100644
--- a/spec.md
+++ b/spec.md
@@ -3,6 +3,12 @@
 16^2 sized stack
 16^2 sized return stack
 
+input data is a single short at __0xbffe__
+
+screen data is 8-bit indexed on two layers
+(one short is two pixels, one for each layer), and located
+__from 0xbfff to 0xffff__
+
 # OPS
 NOP    ( -- ) sit back and do nothing
 LIT x  ( -- x ) push x to top of the stack
diff --git a/src/orgaasm.c b/src/orgaasm.c
index 3e8477d..18a0e54 100644
--- a/src/orgaasm.c
+++ b/src/orgaasm.c
@@ -233,6 +233,10 @@ main(int argc, char **argv)
 	}
 	strcpy(data_dup, data);
 
+	/* Manually register standard addresses. */
+	register_label("Input", 0xbffe);
+	register_label("Screen", 0xbfff);
+
 	/* First pass, find labels. */
 	first_pass(data);