>Yeah, I already knew that... 4 banks of shadow-registers and IX and IY can
>also be swapped.
>Bu err... I kinda like my conventional limit of AF, AF', BC, BC', DE, DE',
>HL, HL', IX and IY (and IR, PC and SP).
Actually that IS your limit. It's not just 4 banks of shadow-registers,
it's 4 banks of EVERYTHING.
>:And that's not counting I, PC and SP ^_^
>
>But you have counted R in??? THen you should also count I in. By the way, if
>you need an extra register on Z80, you can just use I (unless you are in the
>interrupt modes which uses I (2, I believe).
You haven't recalculated what I said, right? :) I had counted R in, it's
not used for refresh in Z380 anymore.
I know on MSX2 you can use I, but hadn't included it in the register count
for Z380, because I think it would be much better if we'd use a different
Interrupt Mode. (There's even an extra one on Z380, but I haven't looked
much into them yet)
Anyway, if you really want to use I, it's a 24 bit register in Z380.
Actually, talking about interrupts. There are 4 levels of external
interrupts, and each can be disabled seperately! So if you have for
instance the VDP and another device, if you connect them to different
interruptlines on the chip you can disable the VDP int's without loosing
the other.
Greetz,
Patriek
,--. ,-------. ,--. Homepage: \"To make a mistake is
| '--.| __ \ \__/ www.xs4all.nl/~newimage/ / human, but to really
| __|| | | | ,--. E-mail: \ fuck things up, you
| | | | | | | | [EMAIL PROTECTED] / need a computer."
| '---' | | '--' | \- Glenn Scott,
\_________| |________| The New Image -since 1991-/ Secret Agent W7
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