Fixed cbm_k_readst() to work around a VIC-20 Kernal bug.

It properly returns the RS-232 device's status.
2021-01-13 03:20:19 -05:00
parent 0f1386ff4c
commit 710c6c6f2f
3 changed files with 37 additions and 8 deletions
--- a/libsrc/cbm/c_readst.s
+++ b/libsrc/cbm/c_readst.s
@@ -1,5 +1,6 @@
 ;
-; Ullrich von Bassewitz, 03.06.1999
+; 1999-06-03, Ullrich von Bassewitz
+; 2021-01-12, Greg King
 ;
 ; unsigned char cbm_k_readst (void);
 ;
@@ -10,6 +11,5 @@


 _cbm_k_readst:
-        jsr     READST
-        ldx     #0              ; Clear high byte
-        rts
+        ldx     #>$0000
+        jmp     READST