From 094b0c007cab885eadc29f0c17dc1f4c7c025129 Mon Sep 17 00:00:00 2001
From: kub <derkub@gmail.com>
Date: Sun, 2 Feb 2025 23:09:23 +0100
Subject: [PATCH] sms, small improvement for tape write
---
pico/sms.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/pico/sms.c b/pico/sms.c
index c70b8b04..83f021db 100644
--- a/pico/sms.c
+++ b/pico/sms.c
@@ -356,12 +356,13 @@ static void tape_write(int cycle, int data)
if (pt->isbit) {
pt->poll_count += (data >= 0);
if (data >= 0 && pt->poll_cycles >= pt->cycles_sample*15/16) {
- // determine bit, either 2400Hz, or 1200Hz, or bust
+ // determine bit, duration ~1/1200s, either 2400Hz, or 1200Hz, or bust
switch (pt->poll_count) {
case 4: pt->bitsample = '1'; break; // 2*2400Hz
case 2: pt->bitsample = '0'; break; // 1*1200Hz
default: pt->bitsample = ' '; break; // ignore everything else
}
+ if (pt->poll_cycles >= pt->cycles_sample*17/16) pt->bitsample = ' ';
if (pt->poll_cycles < OSC_NTSC/15*2) {
samples = ((u64)pt->poll_cycles * pt->cycles_mult + 0x80000000LL) >> 32;
--
2.39.5