[Coco] Assembler question

Helio Emery Jr. helioemery at hotmail.com
Thu Sep 15 10:22:51 EDT 2011

Hi Gene, thanks for the tip.And sorry for taking so long for me to respond, I was stucked with some things in my job and wasn't looking personal e-mails for a while.
I really liked your tip, but didn't know where to find krnp3 and krnp4 for the OS-9 Level 1, v2.00 I'm using.Can you direct me? Thanks,Helio  > From: gheskett at wdtv.com
> To: coco at maltedmedia.com
> Date: Sun, 28 Aug 2011 19:48:29 -0400
> Subject: Re: [Coco] Assembler question
> On Sunday, August 28, 2011 07:37:08 PM Helio Emery Jr. did opine:
> > Hey all,
> > 
> > I found what was doing.
> > It turns out it was a silly beginners mistake.
> > I was addressing a constant using U register indirect addressing,
> > instead of pcr indirect addressing. This is one of the things that
> > makes an assembly programing much more dificult to learn. The compiler
> > does not help with this kind of mistakes...
> > And my program is now with some 300 lines of code, so it's not always
> > ease to see those mistakes while learning.
> As a relative beginner, you may find that building yourself a boot disk 
> with krnp3 and krnp4 in it is quite helpful.  p3 is the error translator so 
> that an error 216 is translated to tell you "file not found" for instance.  
> p4 in turn implements the 'os9 F$RegDmp' call.  To use that, put the CC 
> register on the stack, make the call, which dumps all the cpu registers to 
> the terminal screen, and pop CC back off the stack and the rest of your 
> program will never know it was tapped into to see if it was correct.  
> Virtually every line of vfy was so inspected when I wrote it yonks ago, and 
> is the major reason vfy is, AFAIK, dead stable.
> > Anyway,
> > Thanks everybody for helping a newbee.
> > Now the program works as it should.
> > See you soon here,
> > Helio
> Cheers, gene
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