>Hi people,
>
>Thinking that you should set the interruptvector at #C000 when you set I to
>#C0 is a commonly made mistake in the MSX world. You should set your
>interruptpointer at address #C0FF instead. As some of you might know, the
>databus in the MSX is connected to VCC with pull-up resistors
At 10:13 PM 2/22/99 +0100, you wrote:
[about using IM2]
>You should set your
>interruptpointer at address #C0FF instead. As some of you might know, the
>databus in the MSX is connected to VCC with pull-up resistors. As a
>consequence the Z80 will always fetch the value 0xFF when reading from
] This is true on a standard MSX with correct devices connected to it. If on
] the other hand a device only checks IORQ and not M1, it might put data on
] the bus when it is read at interrupt-time (In this mode IORQ and M1 are
] both active).
A device which ignores M1 does not respect the Z80 nor
On Mon, 22 Feb 1999, Alex Wulms wrote:
> Thinking that you should set the interruptvector at #C000 when you set I to
> #C0 is a commonly made mistake in the MSX world. You should set your
> interruptpointer at address #C0FF instead. As some of you might know, the
> databus in the MSX is connec
] You probably won't get problems.
] However, in Dos it is easiest to replace the bytes at adress #38, for
] example putting a JP Interrupt there. In Basic, it is -to my opinion- better
] if you swith away the ROM, however you could also set the other interrupt
] mode (mode 2?) in which the high b
>I read (nearly) all the messages from the last time...
>- Oh my god! I really miss mails refering to (program-) technical
thingies...
>
>So - lets start a "serious" thread... ;cP
**Great**
>DOS 2 & memory
>--
>I found out that the DOS2 page-switch routines are
>kinda slow. Does
Hi!
I've got a mistake to fix...
I wrote:
>Did you know that you shouldn't put the MoonSound volume too high? If you
>do, it will clip the sound and it will sound bad.
>I made a single channel that plays a sample which uses the full amplitude
>range. I put the volume for that channel on maximum
] I've been wondering. Except for the opcode and the timing, is there a
] difference between RET and RETI? I know RETN does iff1=iff2, RET. But my
] documentation on RETI only says that the program knows the interrupt is
] finished.
Quoted from a book about the Z80, describing the RETI instruction
On Fri, 5 Feb 1999, Maarten ter Huurne wrote:
> The default MSX interrupt handler pushes all registers (normal and
> alternative) to the stack. This is safe, but slow.
> If you choose not to use the alternative registers in your program, and not
> to use them and IX and IY in your interrupt routi
At 08:31 PM 2/5/99 +0100, you wrote:
>DOS 2 & memory
>--
>I found out that the DOS2 page-switch routines are
>kinda slow. Does anybody know a simple, "legal", and
>compatible way to speed up those bottlenecks?
Slow?
This is what PUT_P2 does on my GT:
jp #EE3A
#E
Hi!
I read (nearly) all the messages from the last time...
- Oh my god! I really miss mails refering to (program-) technical thingies...
So - lets start a "serious" thread... ;cP
DOS 2 & memory
--
I found out that the DOS2 page-switch routines are
kinda slow. Does anybody know a
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