diff --git a/res/dsk/championship lode runner PRODOS (san inc pack).dsk b/res/dsk/championship lode runner PRODOS (san inc pack)(4cade compatible).dsk
similarity index 99%
rename from res/dsk/championship lode runner PRODOS (san inc pack).dsk
rename to res/dsk/championship lode runner PRODOS (san inc pack)(4cade compatible).dsk
index 0f5c001c7..c7f033871 100644
Binary files a/res/dsk/championship lode runner PRODOS (san inc pack).dsk and b/res/dsk/championship lode runner PRODOS (san inc pack)(4cade compatible).dsk differ
diff --git a/src/glue.prorwts2.a b/src/glue.prorwts2.a
index bba176a44..662b9cad8 100644
--- a/src/glue.prorwts2.a
+++ b/src/glue.prorwts2.a
@@ -612,12 +612,23 @@ ProDOS_enter
     rts
 
 @imp_read
-    lda    #cmdread
-    !byte  $2c
+    clc
 @imp_write
-    lda    #cmdwrite
+    php
+    lda    #cmdread
+    adc    #0
     sta    reqcmd
     jsr    @set_rdwrbuff
+    plp
+    bcc    @skip_align
+    lda    sizelo
+    adc    #$fe
+    lda    sizehi
+    adc    #1
+    and    #$fe
+    sta    sizehi
+
+@skip_align
     jsr    hddrdwrpart
     ldy    #6
     lda    sizelo2