From d5af5d98b8dfec3bd20bec7215fffd856a9f00f8 Mon Sep 17 00:00:00 2001
From: CrazyEttin <>
Date: Thu, 22 Sep 2022 00:59:08 +0300
Subject: [PATCH] Modify the behaviour at the buffer end and fix a typo and
 some terminology in the readme

---
 gidubba.asm |  4 ++--
 readme.md   | 14 ++++++++------
 2 files changed, 10 insertions(+), 8 deletions(-)

diff --git a/gidubba.asm b/gidubba.asm
index 17e2634..97f1c68 100644
--- a/gidubba.asm
+++ b/gidubba.asm
@@ -1400,8 +1400,8 @@ inloop: load    r1, ffff
         load    r2, bfsize
         brneq   r0, r2, chstor
 
-        ;Backtrack if at the buffer end
-        load    r2, #8
+        ;Ignore the input and print an underscore if at the buffer end
+        load    r2, #5f
         store   ffff, r2
         breq    r0, r0, inloop
 
diff --git a/readme.md b/readme.md
index fc148fd..448589f 100644
--- a/readme.md
+++ b/readme.md
@@ -11,9 +11,9 @@ System requirements
 
 Gidubba requires at least 4 KiB of RAM. It uses an ASCII-compatible
 terminal with local echo at address FFFF, and optionally a character
-printer at address FFFE and a paper tape reader and punch or a casette
-drive at FFFD. Do not be afraid to modify the code yourself if your
-setup requires it! (And if you do, apologies for the spaghetti.)
+printer at address FFFE and a paper tape reader and punch or a cassette
+deck at FFFD. Do not be afraid to modify the code yourself if your setup
+requires it! (And if you do, apologies for the spaghetti.)
 
 Format
 ------
@@ -51,8 +51,8 @@ Commands with two arguments:
 
 Commands with no arguments:
   * P: Print
-  * R: Read from the tape reader or casette drive
-  * W: Write to the tape punch or casette drive
+  * R: Read from the tape reader or cassette deck
+  * W: Write to the tape punch or cassette deck
 
 A delete (^?) discards the preceding character and outputs an underscore
 to the terminal. An escape (^[) discards the contents of the current
@@ -60,7 +60,9 @@ command or line and outputs a backslash and a newline to the terminal. A
 carriage return (^M) or a line feed (^J) inputs a newline and commits
 the current command or line. An end-of-file (^Z) discards the current
 command and halts the computer or discards the current line and returns
-to the command prompt.
+to the command prompt. At the end of the input buffer any input other
+than those described in this paragraph is ignored and an underscore is
+output to the terminal.
 
 There are two kinds of error messages: a question mark (?) for an
 erroneous command and an exclamation mark (!) for lack of RAM.