On Tue, 13 Apr 1999, Si Owen wrote:
It'd probably work if done as a C union, but I wasn't sure how efficient
that'd compile up to be compared to the simple variable version. I might
give it a try with HL to see what different it makes.
Si
I was under the (probably ill-informed)
On Wed, Apr 07, 1999 at 04:10:53PM +0100, Si Owen wrote:
Ian Collier wrote:
Does the Amstrad DSK format not cover this? (I don't actually
know anything about it, except that it is more complicated than
a straight dump of all the tracks on the disk.)
I've not found any official docs for
Ian Collier wrote:
It was basically a choice between keeping 8-bit quantities and
shifting+ORing whenever register pairs are used, and keeping 16-bit
quantities and shifting whenever single registers are used. I made the
choice arbitrarily as it seemed easier to deal with the 8-bit registers
On Tue, 13 Apr 1999, Si Owen wrote:
It'd probably work if done as a C union, but I wasn't sure how efficient
that'd compile up to be compared to the simple variable version. I might
give it a try with HL to see what different it makes.
Si
I was under the (probably ill-informed)
Z flag but left the other part of the expression alone. It's a great C Z80
emulator, and I can't see there being much else to squeeze out of it without
going to ASM
Actually I think I just typed in what came into my head - I'm sure some of
the flag calculations must be horribly
Aley Keprt wrote:
Well, I have used another Z80 CPU emulator in my SAA1099 player.
It is not 100%, but it uses very efficient algo's for computing flags.
And it is platform independent. This may help.
Sounds good - I'd come across the look-up tables in another Z80 emulator and
wondered about
From: Si Owen [EMAIL PROTECTED]
Aley Keprt wrote:
Well, I have used another Z80 CPU emulator in my SAA1099 player.
It is not 100%, but it uses very efficient algo's for computing flags.
And it is platform independent. This may help.
Sounds good - I'd come across the look-up tables in
Simon Cooke wrote:
Don't forget -- the cache comes into play here a lot, so tables aren't
necessarily as efficient as you might think. PROFILE YOUR RESULTS!!!
I completely agree - my Celeron only has 128K of cache but it's running at
full clock speed (464MHz for my setup) giving it a nice
From: Si Owen [EMAIL PROTECTED]
In the floppy driver I've added the direction flag and write protection,
and
tighened up some of the flags used. I'm playing with the idea of yet
another
disk format capable of handling custom disk formats used by some of the
commercial software (and possibly
On Tue, Apr 06, 1999 at 04:15:16PM +0100, Si Owen wrote:
In the floppy driver I've added the direction flag and write protection, and
tighened up some of the flags used. I'm playing with the idea of yet another
disk format capable of handling custom disk formats used by some of the
commercial
Ian Collier wrote:
Does the Amstrad DSK format not cover this? (I don't actually
know anything about it, except that it is more complicated than
a straight dump of all the tracks on the disk.)
I've not found any official docs for it but I've flicked through the
comments in some ASM code that
Simon Cooke wrote:
Nothing time-critical would be in Java - I mean, yeuck! - but I don't mind
having the overhead of C++ for a disk controller :)
Would it need to be time critical? Wouldn't it be running in 'emulator'
time anyway, so it'd only need to stay in sync with that?
Si (NSFMSFT)
Hi Allan,
Before I go on, I would just like to say thanks to Si for taking on
SimCoupe for Win32.
Hope you don't mind if I pick your brains from time to time :-) I'm working
to get most of the original functionality up and running under Win32 before
letting anyone at it. Even then it'll still
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