Set the right bit, and only the right bit.

tschak909 · tschak909 · commit 45e6f824727a · 2018-07-12T11:54:06.000-05:00
diff --git a/src/c64/io.c b/src/c64/io.c
@@ -30,7 +30,7 @@ void io_recv_serial_flow_off(void)
 {
   // for now, assume user port.
   xoff_enabled=true;
-  POKE(0xDD01,0);
+  POKE(0xDD01,PEEK(0xDD01)&0x02);
 }
 
 /**
@@ -40,5 +40,5 @@ void io_recv_serial_flow_on(void)
 {
   // For now, assume user port.
   xoff_enabled=false;
-  POKE(0xDD01,1);
+  POKE(0xDD01,PEEK(0xDD01)|0x02);
 }

Original file line number	Diff line number	Diff line change
`@@ -30,7 +30,7 @@ void io_recv_serial_flow_off(void)`
`30`	`30`	`{`
`31`	`31`	`// for now, assume user port.`
`32`	`32`	`xoff_enabled=true;`
`33`		`- POKE(0xDD01,0);`
	`33`	`+ POKE(0xDD01,PEEK(0xDD01)&0x02);`
`34`	`34`	`}`
`35`	`35`
`36`	`36`	`/**`
`@@ -40,5 +40,5 @@ void io_recv_serial_flow_on(void)`
`40`	`40`	`{`
`41`	`41`	`// For now, assume user port.`
`42`	`42`	`xoff_enabled=false;`
`43`		`- POKE(0xDD01,1);`
	`43`	`+ POKE(0xDD01,PEEK(0xDD01)\|0x02);`
`44`	`44`	`}`