From: Maik Fischer <maikf@qu.cx>
Date: Sun, 15 Oct 2017 22:26:47 +0000 (+0200)
Subject: kasse: Add comment why we disable IRQs
X-Git-Tag: rgb2rv17~10^2
X-Git-Url: https://git.sur5r.net/?p=c128-kasse;a=commitdiff_plain;h=d34507bdb191c8a3106815ac6eec8222db513666

kasse: Add comment why we disable IRQs
---

diff --git a/src/kasse.c b/src/kasse.c
index 4bed5cf..c7c2cc4 100644
--- a/src/kasse.c
+++ b/src/kasse.c
@@ -412,6 +412,10 @@ int main(void) {
   /* clock CPU at double the speed (a whopping 2 Mhz!) */
   fast();
 
+  /* Manipulate the VDC with IRQs turned off.
+   * KERNALs default IRQ handler will also try to read the VDC status
+   * register, which could interfere with our code trying to read it.
+   */
   SEI();
   vdc_patch_charset();
   CLI();