× The internal search function is temporarily non-functional. The current search engine is no longer viable and we are researching alternatives.
As a stop gap measure, we are using Google's custom search engine service.
If you know of an easy to use, open source, search engine ... please contact support@midrange.com.



Luis Rodriguez wrote:

Anyway, if you solve your problem please let us know, if only because some
of us hate “loose ends” :-).

Well, the loose ends are neatly tied up on the MI list, but to summarize (and make it clear to those who aren't MI geeks):

Based on information from Leif Svalgaard's web site, I found the values for the "Option List" bytes passed to the RLA system calls, and it seems that a hex '01' in the first byte is "Read First."

When I manually changed that in the application's SETLL-equivalent call (from the debugger), all I managed to do was crash it. And setting the RRN to zero or lower, although it didn't crash anything, didn't help, either.

Then Monday evening, mainly prodded by some of the more practical suggestions I'd gotten, I had a flash of insight: poke that x'01' byte into the option list of the READ-equivalent call. So I recompiled to make that option list debugger-accessible, and then, when I finally got back to it yesterday morning, I tried it, and it worked perfectly.

All that was left was to turn that idea into something that would work in a shippable product, which took only a few hours: now, whenever the app seeks to a RRN <= 1, it also sets the read option to "read first" (which is reset to its normal value immediately after every read).

--
JHHL

As an Amazon Associate we earn from qualifying purchases.

This thread ...

Follow-Ups:
Replies:

Follow On AppleNews
Return to Archive home page | Return to MIDRANGE.COM home page

This mailing list archive is Copyright 1997-2024 by midrange.com and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available on our policy page. If you have questions about this, please contact [javascript protected email address].

Operating expenses for this site are earned using the Amazon Associate program and Google Adsense.