So the SAMs z80 really is actually slowed down quite considerably, I hadn`t
realised how much :(
Thanks for the details :)
Andrew Collier <[EMAIL PROTECTED]> wrote: On 17 May 2007, at 23:24, Calvin
Allett wrote:
>> Andrew Collier wrote:
>> Because of the Sam's memory timings, using JR is usu
On 17 May 2007, at 23:24, Calvin Allett wrote:
Andrew Collier <[EMAIL PROTECTED]> wrote:
Because of the Sam's memory timings, using JR is usually as fast (or
slightly faster than) using JP. That may change with Mayhem
accelerator!
Thanks :) I`ve been reading the 1995 posts to the mailing
Thanks :) I`ve been reading the 1995 posts to the mailing list these
past few days, and it`s amazing how much I`m picking up from
those old old posts, so I`ve seen it mentioned that they run at around
the same speed on SAM, am I remembering right that it depends
where in screen the raster is when t
lar MC routine.
Adrian
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Calvin Allett
Sent: 16 May 2007 02:46
To: Adrian
Subject: RE: MC Interrupts
`Did someone call? ;) Yes it was the early issues, it was issues 1-5 i think,
` i was only talking to colin this
Ah sweet :) soz for delay, just spent 45 mins typing another reply !
Handy command then JR
Colin Piggot <[EMAIL PROTECTED]> wrote: > What`s the difference between a JP
and a JR, I don`t even mean
> in T-States, but what varies between the way they work. If you`s
> don`t mind me asking ?
JP rea
know about the Screen/display commands,
some dont, its not always that hard to alter. The grabbing is a similar MC
routine.
Adrian
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Calvin Allett
Sent: 16 May 2007 02:46
To: Adrian
Subject: RE: MC Interrupts
`Di
On 17 May 2007, at 22:17, Calvin Allett wrote:
What`s the difference between a JP and a JR, I don`t even mean
in T-States, but what varies between the way they work. If you`s
don`t mind me asking ?
A JR takes less space, two bytes compared to a JP instruction which
takes 3. In a JR, you tak
> What`s the difference between a JP and a JR, I don`t even mean
> in T-States, but what varies between the way they work. If you`s
> don`t mind me asking ?
JP reads in two bytes more to use as an address to jump to.
JR reads in only one more byte, to use as an offset from the current address
to
What`s the difference between a JP and a JR, I don`t even mean
in T-States, but what varies between the way they work. If you`s
don`t mind me asking ?
Cal...
`Geoff Winkless <[EMAIL PROTECTED]> wrote:`Geoff Winkless wrote:
> Anyway, something like:
[snip]
Sorry, it's been a while and I was tired
Geoff Winkless wrote:
> Anyway, something like:
[snip]
Sorry, it's been a while and I was tired (!!), those local JP's should all
(of course) be JR's!
Geoff
__
This email has been scanned by the MessageLabs Email Security Syst
lf Of Calvin Allett
Sent: 16 May 2007 02:46
To: Adrian
Subject: RE: MC Interrupts
`Did someone call? ;) Yes it was the early issues, it was issues 1-5 i
think,
` i was only talking to colin this evening about that, now ive moved i
` really need to get on with finishing it, although i lost all my
`Did someone call? ;) Yes it was the early issues, it was issues 1-5 i think,
` i was only talking to colin this evening about that, now ive moved i
` really need to get on with finishing it, although i lost all my code
` when i lost the sam harddrive. Ive now got a sam in a can and have
` some ne
g when you want to, you don't need interrupts, you don't
need anything clever in MC to do checking etc.
I might be completely off track here, so let me know J
Adrian.
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
On Behalf Of Calvin Allett
Sent: 15 May 2007 23:31
To: Ad
no probs mate, I`m not exactly gonna be able to do anything with any MC code
yet anyhow, and I know your busy :) I do love looking through the issue`s I
have, it always eggs me on to do more coding, but I need to get the early
issue`s especially for the (sounding great) articles :D
[EMAIL PROT
Quoting Calvin Allett <[EMAIL PROTECTED]>:
I still need to catch up on the later issue`s, and the earlier
ones... I`d forgot there was such an article, but I`d heard, one of
the early ones I think :)
I've got a site to work on tonight, otherwise I'd be dipping in my issues to
look for you :
I still need to catch up on the later issue`s, and the earlier ones... I`d
forgot there was such an article, but I`d heard, one of the early ones I think
:)
[EMAIL PROTECTED] wrote: Quoting Calvin Allett :
> I`ve come across a little routine on an old disk magazine that
> provides four 8*8 pix
Quoting Calvin Allett <[EMAIL PROTECTED]>:
I`ve come across a little routine on an old disk magazine that
provides four 8*8 pixel masked `sprites` via a MC interrupt routine,
it seems pretty fast, and am wondering about trying to use it,
however I`m wondering if it`s possible to alter an inter
Quoting Calvin Allett <[EMAIL PROTECTED]>:
I used to love these demo`s, and the converted games, as I still
usually prefer AY music over The Sound Machine, or E-tracker, although
some SAM tunes blow the AY away :) I was thinking it might be easier
to get someone to do a tune or two for games, if
Quoting Colin Piggot <[EMAIL PROTECTED]>:
Interrupts aren't affected by the speed of the machine.
The ASIC generates the frame interrupt every 50th of a second, it's all tied
right into the video timings. So things like music players, or any frame
interrupt (or line interrupt) routines don't ne
Calvin Allett wrote:
> I`ve been wondering this before, in relation to the Mayhem
> accelerator, as if wanting to write a game to run at 20Mhz
> (about four times normal speed with uncontended RAM?)
> then if I`d be able to run an intterupt music player, but have
> the player altered to only play t
Calvin Allett wrote:
> so would it seem feasable to be able to alter the routine
> with a flag, so that it jumps straight back every other frame
> and only draws the other frames?
"`Assuming you don't need to worry about redrawing them if they haven't
`moved
`you could simply add your own inte
Calvin Allett wrote:
> I`ve been wondering this before, in relation to the Mayhem
> accelerator, as if wanting to write a game to run at 20Mhz
> (about four times normal speed with uncontended RAM?)
> then if I`d be able to run an intterupt music player, but have
> the player altered to only play t
Calvin Allett wrote:
> so would it seem feasable to be able to alter the routine
> with a flag, so that it jumps straight back every other frame
> and only draws the other frames?
Assuming you don't need to worry about redrawing them if they haven't moved
you could simply add your own interrupt
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