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Path: utzoo!utgpu!water!watmath!clyde!cbosgd!ihnp4!chinet!karld
From: karld@chinet.UUCP
Newsgroups: comp.sys.tandy
Subject: Re: Double-sided disk for LDOS 5.3
Message-ID: <1042@chinet.UUCP>
Date: Wed, 20-May-87 18:15:23 EDT
Article-I.D.: chinet.1042
Posted: Wed May 20 18:15:23 1987
Date-Received: Sat, 23-May-87 00:55:17 EDT
References: <12082@topaz.rutgers.edu> <858@kodak.UUCP>
Reply-To: karld@chinet.UUCP (Karl Denninger)
Organization: Chinet - Public Access Unix
Lines: 40
Keywords: LDOS 5.3, Model III

In article <858@kodak.UUCP> gardner@kodak.UUCP (dick gardner) writes:
>In article <12082@topaz.rutgers.edu> wchao@topaz.rutgers.edu (William Chao) writes:
>>
>>   Can someone tell me how to make double-sided LDOS 5.3 boot-disks
>>from a single-sided LDOS 5.3 master disk.  I tried first by formatting
>>double-sided and then issue a BACKUP :0 :1 (S,I) to get the system
>>files copied over, but it will not boot, I'll get a DISK-ERROR message
>>on the screen.  I have successfully made double-sided boot-disks
>>for LS-DOS 6.3 by doing exactly the same thing and it works fine.
>>   What's going on here?????
>>
>If I remember correctly, BACKUP creates a mirror image copy.  You should
>be able to COPY files from an SD diskette to a DD without problem.
>
>Also, the QFB utility will do a conversion when backing up, (I think).
>

(Note: I have not investigated the boot program to insure that this is the
actual sequence of events, but from observation it seems to be the right
explanation).

Not quite. There is a subtle problem at work here. The file SYS0/SYS *MUST*
be on side (1) of the disk, or it will not boot. If you do a simple
"Backup" command, you flip a coin -- and usually lose. The proper way to
make a double-sided boot disk is to perform this:

FORMAT the diskette that is the target.
BACKUP SYS0/SYS:0 :1 (S,I)   [Make sure SYS0 is findable by BOOT/SYS]
BACKUP /SYS:0 :1 (S,I)       [Copy the rest of the system files]

I've used this procedure myself to make 80 track boot disks and it works
fine. I believe that TRSDOS 6.2/6.3 just gets lucky -- it all depends on
where the next free space is on the disk when SYS0/SYS copies.


-- 

Karl Denninger				UUCP : ...ihnp4!ddsw1!karl
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