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| How to handle the Rom/Ram memory slots?
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Prodatron
msx master
Berichten: 1088 |  Geplaatst: 07 Mei 2006, 20:27 |
Thanx for information, you are too fast!  I will go on now trying this all... |
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Prodatron
msx master
Berichten: 1088 | Geplaatst: 07 Mei 2006, 20:31 |
Wow, the multitasking kernel is running now! I saw, that the ROM uses RETI to return from the interrupt. I thought, the MSX doesn't use IM2, so why should a RETI be needed?
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AuroraMSX
msx master
Berichten: 1231 | Geplaatst: 07 Mei 2006, 20:40 |
Quote:
| Wow, the multitasking kernel is running now!
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 That's a big WOW! indeed
Quote:
| I saw, that the ROM uses RETI to return from the interrupt. I thought, the MSX doesn't use IM2, so why should a RETI be needed?
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There's no real need indeed to use RETI; RET would do just as fine... |
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jr
msx addict
Berichten: 310 | Geplaatst: 07 Mei 2006, 21:06 |
Quote:
| Good. I was worried for a bit that you could be using IM2, which won't work on MSX.
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Sorry, going a little bit off-topic but couldn't resist replying since your statement isn't exactly correct. While it may not be entirely usable in the way it was originally designed, IM2 still works on MSX. I'm now remembering stuff back 20 years ago but if I remember correctly for example River Raid game is using IM2 by having a 256 byte table filled with the same byte to get the interrupts forwarded to the correct address. |
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Edwin
msx professional
Berichten: 594 | Geplaatst: 07 Mei 2006, 22:32 |
That hack is not exactly within my definition of "working". I didn't know it was actually used though.
Prodatron> Cool, that was quick!
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