From 61b644866337d8db517beb8f089ef4311b83bd39 Mon Sep 17 00:00:00 2001
From: Julian Blake Kongslie
Date: Sun, 30 Jan 2022 16:35:02 -0800
Subject: Working focal!

It turns out that indirect jumps don't preincrement.

The interpreter is almost unreadable at this point due to debugging
messages. Sorry.
---
 PLAN | 15 ++-------------
 1 file changed, 2 insertions(+), 13 deletions(-)

(limited to 'PLAN')

diff --git a/PLAN b/PLAN
index e9689e2..2e32e77 100644
--- a/PLAN
+++ b/PLAN
@@ -1,13 +1,2 @@
-Turn on blinkenlights from the PDP core
-
-Implement remaining TTY output instructions
-
-Jules thinks clock is most likely interrupt source
-    pdp8 source tries to map clock interrupts to "real time" - we might want to mangle that to make it deterministic
-
-Sources of interrupts observed:
-    PTR flag is set from loader, might be ignorable
-    Memory management is poked from inside ISRs, might be ignorable (MMU should be optional)
-    TTO ready for output interrupt - this looks like a very likely candidate
-    TTI input ready interrupt - this looks like a very likely candidate
-        Looks like these happen even when there is no input available - might be caused by the program itself doing something a little funny
+Instrument simh to have deterministic input timing (stuffed input queue)
+Instrument simh to have diagnostic messages about interrupt sources and terminal/keyboard/interrupt enable flags
-- 
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