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

Tormod Volden lists.tormod at gmail.com
Fri Jun 17 10:16:29 EDT 2016

On Fri, Jun 17, 2016 at 4:10 PM, Bill Pierce via Coco wrote:
> Ok, changed a byte in the "dir" command, and it loads and fails miserably LMAO
> I tried both typing the command directly and manually loading it. NitrOS9 allowed the module to load, though it failed when run. In fact, not only did hang up VCC, but DW4 as well... I had to restart both.
> So no CRC checking is done at all. I may heve been remembering seeing CRC errors from the old days before Nitros9 LOL
> My questions would be, is this a good thing or bad? A lot of crashes could be avoided with CRC checking was "On". Why was it turned off? Was it off in the original OS9?
> I know "boot", "REL" and "Krn" have modified headers (mainly for the "dos" loading and relocation code) and will not check properly until they are "in place" after booting. Maybe this is why it was turned of (??). I would think since these modules are loaded and executed before anything else that crc checks on them (after the boot) would be redundant.

>From the code comments, and Brett's observations, I think it is purely
for performance reasons. You can enable it by patching init, and I
think all system modules will still load fine, just slower.


More information about the Coco mailing list