[Coco] NitrOS9 L2 CoCo 3 question: Display settings/modifications

[Bill Pierce]

Tormod, it could be that after a module fails, OS9 tries to error check it (??), though I don't think it's THAT smart :-)
I do know that when loading (not booting) a module with a bad CRC, it usually errors with one of the 3 errors, usually 236 (Bad Module Header). This also happens with bad header parity or corrupt headers. This check "may" be done by the "load" command/syscall (??). I'm not really sure, I just know a module with a bad CRC and/or header will not load.
Since I'm actually messing with NitrOS9 this morning, I'll change something with ded in a module with no verify and see if it loads. I may be seeing this on just corrupt headers or bad parities, but I'm sure I've seen "Bad CRC" errors when loading modules (externally, not booting).

 

 


Bill Pierce
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-----Original Message-----
From: Tormod Volden <lists.tormod at gmail.com>
To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
Sent: Fri, Jun 17, 2016 9:37 am
Subject: Re: [Coco] NitrOS9 L2 CoCo 3 question: Display settings/modifications

On Fri, Jun 17, 2016 at 2:34 PM, Bill Pierce via Coco wrote:> Tormod, I find that odd, unless you're referring to loading system modules. If I try to load a program with a bad CRC, it will usually fail. Usually "Error 205 - Illegal Module Header", "Error 232 - Incorrect Module CRC" or "Error 236 - Bad Module Header".> I know OS9Boot files with bad CRCs will load and "attempt" to execute, but bad CRCs usually mean something is corrupt and the boot (or the bad module in some cases) will fail.> Ident & Id will check module headers (even in merged files like OS9Boot) and report bad CRCs.This is the check in Level2 F$VModul which I think is used for all modules:https://sourceforge.net/p/nitros9/code/ci/default/tree/level2/modules/kernel/fvmodul.asm#l269But the proof is in the pudding, of course.Tormod-- Coco mailing listCoco at maltedmedia.comhttps://pairlist5.pair.net/mailman/listinfo/coco