From: theguitarmanSPAM@charter.net   
      
   Thanks again sir for taking the time to break all this down for me.   
   What a time saver!!   
      
   I'll give it a try tomorrow.   
   :-)   
      
   -Chris   
      
   "Frank Durda IV"  wrote in message   
   news:J23Lt3.75@nemesis.lonestar.org...   
   > Chris Young  wrote:   
   > : I know 1.3 is pretty limited, but I can seem to get some of those old   
   > : programs like "trek78" to run with anything else. Not even TRSDOS 6.2.1.   
   > : Is there a way to convert those old programs over to something like LDOS   
   > or   
   > : the other better OS's?   
   >   
   > For starters, if you have a program that runs under TRSDOS 1.x, it won't   
   > run under a Model 4 mode operating system like TRSDOS 6/LS-DOS 6 without   
   > major surgery.  Use a Model III mode operating system, like LDOS 5, which   
   > has a very compatible OS at the system call level.   
   >   
   > You will need to use CONV to copy the programs from TRSDOS 1.x format   
   > to the LDOS 5/TRSDOS 6/LS-DOS 6 disk format, but after that, most   
   > Model III programs that run under TRSDOS 1.3 work fine under LDOS 5.   
   > CONV is on LDOS and can read TRSDOS 1.3 media.  To move files the other   
   > direction back to TRSDOS 1.x is a different and more complex process.   
   >   
   > NEWDOS and some of the other Model III mode OSes may also work with   
   > the typical TRSDOS 1.x program, but LDOS was rigorously tested for being   
   > compatible with TRSDOS 1.x when it came to all documented (and quite a few   
   > undocumented) calls into the OS, plus the catalog of Tandy-sold   
   > applications (from any vendor).  I can't say the same level of effort   
   > for testing for compatibility was put into the others.  LDOS 5   
   > documentation   
   > was also expanded in the Radio Shack releases by Radio Shack disclosing   
   > a number of previously undocumented system calls and system variable   
   > locations.   LDOS 5 eventually came out far superior in its ability to   
   > handle bad input data to system calls, and it was already a lot faster   
   > and more flexible than TRSDOS 1.3, so it was a big winner.   
   >   
   > This was done very late in the Model III life (summer 1982) when   
   > production had nearly ceased and hard disk support was being offered   
   > to existing customers, mainly to get them to stop whining about it.   
   > Hard disk support for Model I was provided at the same time, although no   
   > one really expected many of those to be sold.   
   >   
   > The OS for Model III and I hard disk support was LDOS 5.1.3/R - "R" not   
   > being for "Radio Shack" as is commonly thought, but really revision R,   
   > with LSI having submitted 12 or so revisions of the long-available   
   > LDOS 5.1.3 to Tandy before one was accepted for sale via Radio   
   > Shack.  Myself and the other testers (sometimes up to six) that worked   
   > on this project really beat LSI up during the summer of 1982.   
   >   
   > The work on LDOS 5 for Radio Shack happened so late in the life of the   
   > Model I/III family, NEWDOS, Multidos the other OS makers didn't really   
   > get the opportunity to take advantage of these official OS interface   
   > disclosures and make compatibility adjustments in their OSes, assuming   
   > they wanted to be compatible.  They probably also did not care.   
   >   
   > The Model 4 came out about six months later and the market for Model III   
   > stuff really died then.   
   >   
   >   
   > Frank Durda IV - only this address works:|"The Knights who say "LETNi"   
   >   | demand... A SEGMENT   
   > REGISTER!!!"   
   > You must remove the "LOSE" to mail me.   |"A what?"   
   > http://nemesis.lonestar.org      |"LETNi! LETNi! LETNi!" - 1983   
   > Copr. 2006, ask before reprinting.   
   >   
   >   
      
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