Come and get it!!

I've now added the C64 frame work (and sample app) to the downloads links on the right, scroll down a bit and you can't miss it!

So to recap what I've given you to play with in the framework....

Initialisation, mainloop and interrupts all setup and ready to go.

Production quality multiplexor

Three seprate switchable sorts.

Simple collision detection system

General sprite animation system.

Game based keyboard and joystick routines.

Simple player control framework.

Lightning fast 8x8bit multiply routine.

Simple random number routine.

Built in MMC64 FAT16 file loader.

Simple example platform engine showing the framework in action.

And there you go. As a little aside, the example also has a byterun decompression routine built in that you can use as well. Its all very simple really, but if you have any questions (or find any bugs) feel free to bug me about it.

Hope its of use to you and gets you going on your next great game!

MMC64 loader finished

I've now completed V1.0 of the loader complete with PRG file loading. Its shot up a little to about 900 bytes but it's now functionally complete. The only thing missing (which isn't vital just now) is error checking on initialisation. Its not important because if youve done a game thats supposed to load from an MMC card and its not there, then you have bigger problems! I've just ordered a retro replay so I can check all is well with that too (okay, okay...Coz it's cool...)

So tomorrow night I'll try and knock up a new downloads page somewhere and get all this up for you lot to play with. I'm not sure what I'll work on next but I like the idea of using the MMC card loader in the C64 version of XeO3.

I also want to do a proper Super CPU version of the loader so I can start playing more with that. I'd love to see how many software sprites I can pile on a bitmap screen, and I'd love to try that Lemmings idea too...

MMC64 cleanup

I'm putting the finishing touches to the MMC64 loader and making it work with more files. I've also shrunk it down a fairly sizable amount, with the code shrinking from 1,236 bytes down to 828 bytes (sofar) and the data block has shrunk from 624 to 568. While doing this I've optimised the load a bit so that the bulk of the file gets loaded directly into the destination rather than going via a sector buffer, which should make it twice as fast - in theory.

I'm pruning down all the "nice" bits and making it a bit more hard core C64 only - something I'll reverse when I do a SCPU version in the future. So for example while file sizes can be a full 32bits, we know a stock C64 will be less then 64k, so only work in that size.

That said I've tweaked quite a bit of it so it is a little bit more robust, but it will be likely to fall over if you use it wrongly, which isn't a problem as its not designed for a file browser, but a game that KNOWS what its loading. I've also decided to ignore long filenames, because again a game doesn't care! In fact, chances are you're filenames will be something like L1\1.PRG or LEVEL1\DATA.PRG. But this for a game is fine.

I haven't done a directory search yet and I might not for the 1st release as that'll put the size up again, still we're now sitting at 1,396 bytes total for code and data which is pretty good indeed. So for now you'll either put the game directory in the ROOT or specify something like GAMES\XEO3\LEVEL1\MAP.DAT. I have also yet to do PRG loading, so that it gets the 1st 2 bytes and loads it into the correct address - that will complicate things a little, but it should be okay.

I should also say I expect SAVING to come in later versions as well as its not hard to save to these things, so high score tables or editors can make use of the storage medium as well - which will also be pretty handy. Also...I do not disable interrupts, so technically speaking, you could be playing music, scrolling the screen or whatever while you load things. Also means the SCPU while taking time to load a meg of data can play music and display a loading bar or something!

So... only a little more to do for a 1st version, then I'll knock up antoher web page and post everything for whoever wants it.

Success!

I've now managed to load a file from the MMC64 given a full path+filename! Very cool indeed. It's a shame that you can't page in a ROM that has this functionality built into it. My plan of doing a Plus/4 MMC card was to have a built in ROM with lots of extra features built in like the Kernal, that way adding loading to a game would ultimately be very cheap and you wouldn't need to add all this code.

Still... thats a future thing, for now I need to test this code and load up lots of other files and make sure it all works. Im pretty sure it won't be terribly fast either as its pretty noddy code, however keep it simple and get it working - THEN speed it up and make it impossible to read.

The code is sitting at 1,860 bytes long (1,236 code and 624 data) so it would be nice to shrink this too. If the code can fit inside 1k that would be perfect I think. RAW loading is pretty simple, but including path searching and other features will push up the code space a little.

Anyway... all this aside, it's now working and is pretty cool. As a side note it should now be possible to load large files for my SCPU work; very neat.

MMC64 Progression...

I've progressed quicker than I figured I would and have almost got files loading from it. It also supports directorys and will load a file from a full path+filename (just about). It only uses 8.3 filenames so far, but I suspect it will get expanded to do more in the future.

It takes arond 2k to add this although 600 bytes of it is data and a sector buffer. I suspect this will shrink a little once its all working properly, but to have fast access to 4Gb's of data is probably worth the extra space.

I also plan to put in a recursive directory search, allowing you to search for a game directory and then load from there. That means people won't be forced to put everything in the root directory.

I will also write a full Super CPU version allowing you to load megs directly into memory, and MUCH quick than a floppy could.

Life after floppies....

I've spent a little time trying to chat up my MMC64, but it just won't respond to my tender words, at least I wasn't having much luck until about 5 minutes ago. I was following the documentation completely - cut and paste actually - but with very little to show for it. It then occured to me that since I'm loading from it, it must already be enabled and ready to go. So I've dispensed with the full initialisation and jumped straight in with sector reading, and what do you know! It works! I'm not quite sure what would happen if you have to re-initialise the thing as I can't seem to get that going at all, but as long as the cards in and you've just loaded the main program from that, its all funky.

For a first pass, not having any error state is probably fine, after all its not like you have to swap disks (err...MMC cards) during a game or anything, and if you remove the card then its probably your own fault. Still sometime down the line doing a better fault tolerant system is desirable - but lets get the bugger working first! I still expect this to be released in V1.1 of the framework, but its good to see it shouldn't be too difficult.

I've also added a simple animation system to the framework even though I said I wouldn't. I figured you can always rip it out, and in the end the ones I write are almost exactly the same over and over again so sod it. This means theres now the multiplexor, a few sorts, basic collision, animation, joystick and keyboard input and a very simple test app - which is a good start. Actually, theres 2 test apps. The Frame work has code to bounce sprites around in a simple manner, and then theres the playformer framework which gives a little more realistic usage. Still the more the merrier.

I'll now have to do another web page to download all this rubbish, and expand my wiki page to have some simple documentation...and I mean simple...

C64 framework V1.1?

I've thought of one more thing I'd like to add, but its not a quickie by anymeans so I'll leave it till version 1.1 so that I can get this version released. After speaking about using the MMC card as a loader, I suddenly realised that it would be awesome to have a proper file loader built into the framework. That way these no excuse as to not use it, and it'll make development MUCH simpler. Simply bung your files onto an MMC card in a folder or something, then load them - how simple would that be! It might also mean we would start getting some more games that load directly from the MMC rather than floppy/tape, which would be very cool.

I also suspect V1.2 will be when I start to add remote debugging features through RR-NET. As I've mentioned in the past I do have the beginings of a remote debugger on the Plus/4 and would like to get that onto the C64 but using the ethernet adapter rather than the user port. Although since the upload/download part is prett much GetByte()/SendByte() I can probably have both in case people don't have an RR-NET. It would be good to get a proper devkit again as I was reading about the old PDS system I used to use and starte getting a little homesick for it...

You can read about it HERE if you wish although its in spanish. HERE'S a translated version via Babelfish. It really was an amazing little system and I miss it hugely.


Oh and as a little side note, I've managed to get WWW.XEO3.COM again. I'd let this expire and some bugger pinched it which is why I went to the .ORG, but I've now got it back again so I'm happy.

Xeo3: Sprite time...

Luca's given me a new batch of sprites to bundle together so while I've been doing that, I've also been updating Luca's scripting build so that he gets all the latest features. While doing so I've fixed the parent+child system. This allows small sprites to be joined and act as a single BIG sprite. Luca's been playing with a large mid level baddie, but it wasn't working right. Turns out when I had rewriten the killsprite routine I had inadvertantly broken the link system. I'm not terribly happy with the fix however, as it means I have to loop though all the sprites every time one is killed. Its not the end of the world, but I dont really have any spare FLAG bits to enable me to fix it.
I've only 2 left, and I think I need these for other features. Luca wants to be able to orbit baddies around parents, and I'll need a flag for that, I also need a flag for something else...but that escapes me just now. I may well have to admit defeat and add another FLAG byte, but I really dont want to do that.

I got my Retro Replay today!! Very cool! I think I'll probably get the RRNet and SilverSurfer add on as well as it'll let me squirt stuff down rather than having to copy it to the MMC card all the time. Using a RetroReplay and the MMC64 I can now mount a D64 image and read it like a normal disk, which is very funky - its now a pitty that so many have "custom" loaders that dont work with it! At least Blood Money and Ballistix seem to, well... they manage to load, but blood money then crashes when you start playing, no idea why - seems to have all the graphics and code it needs.