From 95b0453a75580864d46de747042f7c2e316d54be Mon Sep 17 00:00:00 2001
From: "B. Watson" <urchlay@slackware.uk>
Date: Wed, 3 Dec 2025 04:21:26 -0500
Subject: unalf: Fix 15MB bug.

---
 src/io.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

(limited to 'src/io.c')

diff --git a/src/io.c b/src/io.c
index 9a0486d..c4fa295 100644
--- a/src/io.c
+++ b/src/io.c
@@ -1,3 +1,4 @@
+// #include <f65.h>
 #include "unalf.h"
 #include "addrs.h"
 
@@ -130,6 +131,7 @@ int read_alf_header(void) {
 /* read buf_len_l/h bytes into buf_adr_l/h, then store the number
    of bytes actually read in buf_len_l/h. TODO: what about EOF? */
 void readblock(void) {
+	static int bytes_read = 0;
 	int bytes, len, bufadr;
 	u8 *buf;
 
@@ -137,9 +139,15 @@ void readblock(void) {
 	buf = mem + bufadr;
 	len = dpeek(buf_len_l);
 
-	// fprintf(stderr, "readblock, bufadr = $%04x, len = $%04x\n", bufadr, len);
-
 	bytes = fread(buf, 1, len, in_file);
+	bytes_read += bytes;
+
+	/* mimic CIO's behaviour */
+	if(feof(in_file)) {
+		ldy_i(0x88);
+	} else {
+		ldy_i(1);
+	}
 	dpoke(buf_len_l, bytes);
 }
 
-- 
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