Merge pull request #503 from jedeoric/master

[telestrat] cgetc is now available

libsrc/telestrat/cgetc.s

@@ -0,0 +1,28 @@
+;
+; jede jede@oric.org 2017-10-01
+;
+    .export    _cgetc
+   
+    .import    cursor
+    
+    .include   "telestrat.inc"
+
+.proc _cgetc
+        ; this routine could be quicker if we wrote in page 2 variables, 
+        ; but it's better to use telemon routine in that case, because telemon can manage 4 I/O
+        lda     cursor       ; if cursor equal to 0, then switch off cursor
+        beq     switchoff_cursor
+       
+        ldx     #$00         ; x is the first screen
+        BRK_TELEMON(XCSSCR)  ; display cursor
+        jmp     loop         ; could be replaced by a bne/beq but 'jmp' is cleaner than a bne/beq which could expect some matters
+        
+switchoff_cursor:        
+        ldx     #$00         ; x is the first screen
+        BRK_TELEMON(XCOSCR)  ; switch off cursor        
+        
+loop:   
+        BRK_TELEMON XRD0     ; waits until key is pressed
+        bcs     loop
+        rts
+.endproc