Hi!!!
While debugging Illusion City (I'm starting to get the hang of it!) I bumped
into some problems... They are not very critical (I can go on without
knowing about them) but still I'd like to know some answers:
1. What happens if a 1 is written to adress #7FF6 in the MSX-MUSIC ROM???
2. Please check out the subroutine in the attached .ASC-file... It
initializes some kind of device but I really have NO idea which one. If
somebody could explain me I'd be grateful.
3. About the Kanji-ROM, I'd like to have more info about it, because my I
can't find any in my current documentation. I have put the 32kB ROM on my
harddisk and it is a normal ROM with "AB" in the first two bytes and a
Basic-expansion adress set. But I need to know how to access it through
Assembly. Then maybe I can sort-of 'emulate' it resulting in a readable (but
still Japanese) text on MSX-computers without Kanji-ROM.
Some nice things to know:
- Illusion City only supports MSX-MIDI when the computer has more than 256k
RAM. It supports both internal and external MSX-MIDI...
- According to my docs MSX-MIDI only works on a MSX-turboR!!! So Illusion
City only tries to detect an external MSX-MIDI if the computer is an MSX
turboR.
- The check if the computer is an MSX-turboR happens in the CPU-switch
routine. If the computer is not a MSX turboR (checks BIOS IDBYT2 (#002D))
then it enters an infinite loop.
- The mapperroutines are really TERRIBLE programmed!!! It supports 2
mappers, that's a plus, but it assumes the primary mapper (the mapper
enabled when the system boots) to be in slot 3-0!!! On a MSX turboR this is
always true, because the internal mapper is faster, but on a future MSX it
might not be so. So when you have a normal MSX2(+) with an external mapper
which is enabled by default then the mappersystem will go crazy! While it's
only a question of changing one constant into a variable...
- Another terrible thing about the mapperroutines is the mapperdetection:
while detecting the size it corrupts the first byte of every mapperpage but
it doesn't put it back afterwards! Aargh!!!
Anyways, I tried to disable the R800-detection and adapt the mapperroutines,
and it loaded on my MSX2!!! However, it stopped with some messagebox with
KANJI text... So I tried it on my MSX2+ to see if I would be able to read
it. But on my MSX2+ it wouldn't load... Guess I made an error somewhere in
the mapperdetection-routines.
~Grauw
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