DISKEY disk and TAPE to DISK bug

[Madi]

It is suffice it to say that most of us are aware of the famous disk utility program: DISKEY by Sparky Starks. It consists of several subroutines.

It was released by Adventure International in 1982. The same company released an XL-XE compatible DISKEY in 1983 ($79 and $7A were substituted by 00 and 01).

However, what puzzled me for long time is that, the TAPE to DISK subroutine always freeze when "DSKYTAP" file is executed.

DISKEY directory:

F# FILE EXT FS T#

1 DOS SYS 6 39

2 AUTORUN SYS 45 17

3 D 62 7

4 DISKEY 69 151

5---> DSKYTAP 220 15 <---

6 DSKYDRV 235 59

7 DSKYDAT 294 5

8 DSKYSPC 299 62

Apparently, in line 5, "DSKYTAP" file has a USR call to address $0680 which has no code whatsoever. Thus DISKEY crashes.

When the B=USR(1664) is REM or deleted, the file will execute successfully.

Of course, I thought about this USR call and its purpose. Unfortunately, there are many things can be thought of.

The one million $$ question is:

Did Mr. Starks and the publisher (two releases) were not aware of this problem?

The software was reviewed by many magazines and user groups without any mentioning of this bug.

Also, tell date, I could not find any reference discussing the TAPE to DISK bug.

Any one has a clue?

madi

Edited August 12, 2017 by Madi