From f486bbfb1b86533a41bfba44e63cb4da7be2bf38 Mon Sep 17 00:00:00 2001
From: Kelvin Sherlock <ksherlock@gmail.com>
Date: Sun, 9 Jan 2022 19:38:25 -0500
Subject: [PATCH] don't re-enable the cursor blink while there is still pending
 modem data. this improves performance and visuals.

---
 vt100.main.S | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/vt100.main.S b/vt100.main.S
index 272e437..bace64e 100644
--- a/vt100.main.S
+++ b/vt100.main.S
@@ -37,7 +37,6 @@ main	debug main
 	stz SCANINT ; reset 1-sec interrupt
 
 
-
 loop
 	bit LOCAL
 	bmi :kb
@@ -49,6 +48,13 @@ loop
 	jsr vt100
 :kb	
 	jsr keypress
+
+*
+* if there is pending modem data, don't re-enable the cursor yet.
+* 
+	lda read_q_head
+	cmp read_q_tail
+	bne loop
 	jsr enable_cursor
 	bra loop