| |
cadaver
Registered: Feb 2002
Posts: 1160 |
Exomizer on-the-fly loading/decompressing
Hey,
anyone want to share, what is the lowest disk interleave you've managed to use with on-the-fly Exomizer decompression while loading?
I'm currently at 11, using 2-bit transfer and a lame drivecode (using jobcodes only) + 1 sector buffering. However I don't think the drivecode is the problem; if I try to decrease to IL 10 the C64 often doesn't have to wait for the drive at all for the next sector's data, but occasionally the depack will take too long, resulting in missed revolution.
I've already done some optimization to the depack routine, including inlining getting a single bit (literal/sequence decision, and reading the gamma).
Don't think I would switch to another packer just for speed, but nevertheless interested in any battle stories. |
|
... 30 posts hidden. Click here to view all posts....
|
| |
cadaver
Registered: Feb 2002
Posts: 1160 |
True :)
Another matter though is, that I like to keep just one copy of drivecode which I modify for 1581 & other drives, to keep the bootpart size low. The 1541-specific out-of-order scanning & possible custom decode would necessitate a whole 1541-specific second drivecode and would make the bootpart larger.
Anyway, this is already quite specific to my requirements, and in general I'm already happy with loading speed, though in theory I'm operating a technically substandard loader. |
| |
Krill
Registered: Apr 2002
Posts: 2980 |
You can let the drives get their custom drive code directly from the disk rather than the roundabout way of loading drive-specific code into C-64 RAM, then write just a part of it back to the drive in question. This will make the boot part smaller than it is now, too. |
| |
cadaver
Registered: Feb 2002
Posts: 1160 |
Good point, naturally the different drivecodes still exist as part of total data (which can mean few blocks less free for game data) but the initial boot-up time can be reduced that way, as I currently have quite a M-W + M-R + M-E monstrosity going on for the drive type detection on the C64 side :) |
| Previous - 1 | 2 | 3 | 4 - Next |
