From 2a7d855b3582c95d84953b82effe366afbb450a7 Mon Sep 17 00:00:00 2001
From: n loewen <nick@nloewen.com>
Date: Tue, 15 Aug 2023 17:01:51 +0100
Subject: [PATCH] Docs: Add an abandoned interval-timer-based refactor of the
 main CPU loop to dev notes

---
 notes/2023-08-15--dev-notes.md | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/notes/2023-08-15--dev-notes.md b/notes/2023-08-15--dev-notes.md
index ee9e88c..c74537a 100644
--- a/notes/2023-08-15--dev-notes.md
+++ b/notes/2023-08-15--dev-notes.md
@@ -34,4 +34,19 @@ Ken Shirriff, [The 6502 overflow flag explained mathematically](https://www.righ
 - `23-2F` - reserved for future use / variable storage
 - `30   ` - initial value for IP
 - `30-80` - free
-- `80-FF` - free, can be bank-switched
\ No newline at end of file
+- `80-FF` - free, can be bank-switched
+
+## Looping using an interval timer
+
+    const loop = setInterval(async () => {
+      step = step + 1;
+      // Temporary limit as a lazy way to halt infinite loops:
+      if (CYCLE_LIMIT && (step > CYCLE_LIMIT)) {
+        console.log('SIMULATION HALTING - reached cycle limit');
+        clearInterval(loop);
+      }
+      if (!CPU.running) clearInterval(loop);
+      if (CPU.IP >= CPU.memory.length) clearInterval(loop);
+      stepCPU();
+      await logCPUState(debug);
+    }, frameRate);
\ No newline at end of file