Working focal!

It turns out that indirect jumps don't preincrement.

The interpreter is almost unreadable at this point due to debugging
messages. Sorry.

1 files changed, 2 insertions, 13 deletions

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