Add basic support for ORIC Atmos

git-svn-id: svn://svn.cc65.org/cc65/trunk@2046 b7a2c559-68d2-44c3-8de9-860c34a00d81
2003-04-13 22:12:09 +00:00
parent d48f341bba
commit 9f547a5a4d
21 changed files with 1001 additions and 5 deletions
--- a/libsrc/atmos/kbhit.s
+++ b/libsrc/atmos/kbhit.s
@@ -0,0 +1,18 @@
+;
+; Ullrich von Bassewitz, 2003-04-13
+;
+; int kbhit (void);
+;
+
+	.export		_kbhit
+
+	.include	"atmos.inc"
+
+_kbhit:
+        ldx     #$00            ; Load high byte
+        lda     KEYBUF          ; Flag for new char in bit 7
+        asl     a               ; Shift bit 7 into carry
+        txa                     ; A = 0
+        rol     a               ; Move old bit 7 into bit 0
+        rts
+