[Coco] RSDOS TRACEON
robert.gault at worldnet.att.net
Fri Apr 9 23:17:24 EDT 2004
mmarlett at isd.net wrote:
> I have a customer that has lost their Internet connection due to a virus
> and has to reinstall.
> She asked me to post a message to the list in hopes of a solution.
> She writes code in DECB and when she is debugging she uses the TRACEON
> command. Her problem is that it scrolls by so fast that she can't use it's
> output very well. Is there a way to have that output go to a printer?
You have already gotten some suggestions on this problem. The specific
code which handles TRON/TROFF is in Extended Basic and the relevant
$82DE LDA TRCFLG TEST THE TRACE FLAG
BEQ $82F1 BRANCH IF TRACE OFF
LDA #$5B < LEFT HAND MARKER FOR TRON LINE NUMBER
JSR >PUTCHR OUTPUT A CHARACTER
LDA CURLIN GET MS BYTE OF LINE NUMBER
JSR LBDCC CONVERT ACCD TO DECIMAL AND PRINT TO CONSOLE OUT
LDA #$5D > RIGHT MARKER FOR LINE NUMBER
$82F1 JSR GETNCH GET NEXT CHARACTER FROM BASIC
There is nothing in these routines which will change the console out
pointer. That means the TRON output will go to anything the console is
set for. Having this on during tape or disk I/O does not look like a
very good idea.
Depending on the program in question, the console device number at $6F
could be set to printer for the trace and then reset to what is needed
for the program.
In general, TRON is a terrible method for trouble shooting a program.
Why don't you ask your friend what she is attempting to correct? This
group could provide much better methods for tracking down the source of
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