Hi, i been mucking about on an easyflash image in a hex editor after asking sarah jane avory on itch how to use the file i/o system on the cartridge (/image for vice / kungfu / - ...) and she gladly answered she did everything herself on briley but not really anything about how to. (id like to make a game by somewhere around 2150AD) i figured out most of the basic stuff, i can use EAPI, switch the banks, use standard code from every bank etc but i seem to have a problem setting up an irqchain from there.It works but i use for instance a .crt image generated with TRSE and the music sounds like a gabberfest as if the thing keeps triggering , inthere is ack i have checked in the form of ASL $D019. I have a few minor intros i know more or less how to setup and time the things (thats for single system i suppose : JoG demozoo ) Ive been going over .crt images in a hex editor and i learned much about the map of the piano but i must be missing something.
So the question is how do i set up a chain after booting a computer/vice with an easyflash cart inserted , the thing will always start in "ultimax" ( = one bank at $8000(2kb) and one bank at $E000 (2kb), after that you can choose ultimax, "standard 16kb" ($8000(2) $A000(2) which is 4k consecutive but in the cart image stands as 2 banks $8000/$A000) or 8kb (like briley witch chronicles) where you use only the lo-banks and get data at $8000(2kb) for bank 0-63.
I havent backtraced yet but i have working examples , for one thing Neutron by the same SJA, but thats a standard cart that copies itself to memory, then switches out the cart rom and uses irq at $FFFE, briley witch chronicles seems to use ram at $8000-... but it doesnt seem to corellate with the data in the bank set at $de00 so ("maybe") thats banked out too, that one uses the irq using $0314 and sets NMI(0318) to a routine with one operation then RTI , then this week theres the release ( trex bmx simulator easyflash ) which uses different zones, the intro seems to point an irq ("vector?") straight into the cart rom zone at $8000 on boot, then the other one "intro" menu1 uses bank 1 but seems to bank out while the acutal games use higher banks, the cartridge is standard 16kb banks, not ultimax as i can see in vice and they use the irqs at 0314 with NMI(0318) jumping directly to an RTI instruction.
I'll probably figure it out backtracing like i have all the rest but since i found this nice here site i thought i might as well ask (asking costs nothing goes the saying) in the meantime, maybe someone has experience using it and/or a working template (THAT would be la merde indeed). The thing id like to get most is a running irq-chain (playing sid tune and some zone-splits in rasters for different modes et al, its not a fastpaced - button masher to be) while keeping the cart rom active so i can switch between banks fast and use the code therein "as-is" for map and other data or other routines, tho as i understand using the eapi itself to actually write (or read or set) will set SEI. That would be preferred, if thats not possible for some reason i still need a chain that doesnt trigger like a spaztic blur i been looking a few weekends over images totalling several million bytes (lol) and havent really found the missing link here.
If anyone gets past all my signature incoherent rambling here and has a working solution id be much obliged, thx. If i need to elaborate or such and so pls say so, i know i seem to be speaking in tongues to a lot of humans i wont be insulted thanks
