English Amiga Board


Go Back   English Amiga Board > Search Forums

Showing results 1 to 40 of 263
Search took 0.04 seconds.
Search: Posts Made By: Jobbo
Forum: support.WinUAE 01 May 2022, 18:25
Replies: 11
Views: 1,453
Posted By Jobbo
I always use EASy68k for checking cycle times and...

I always use EASy68k for checking cycle times and that is reporting 16 cycles.
Forum: Amiga scene 26 April 2022, 18:07
Replies: 28
Views: 3,904
Posted By Jobbo
Just wanted to say these all look awesome! I...

Just wanted to say these all look awesome!

I especially really love the Fire & Ice rework!
Forum: Coders. Asm / Hardware 19 April 2022, 04:54
Replies: 19
Views: 2,236
Posted By Jobbo
For whatever it's worth I tried a version of my...

For whatever it's worth I tried a version of my test exe on my real A1200 and the second TOD wait is not 100% stable. There's still earlier A/B waits, it might be stable without those. Or it might...
Forum: Coders. Asm / Hardware 18 April 2022, 06:28
Replies: 19
Views: 2,236
Posted By Jobbo
I've given this a quick try without success, I...

I've given this a quick try without success, I have some questions:

What is the stop command doing to the status register and why?
What do you mean by managing the stack?
Why do you say the...
Forum: Coders. Asm / Hardware 14 April 2022, 22:11
Replies: 19
Views: 2,236
Posted By Jobbo
Lots of good ideas but no silver bullets. I’ll...

Lots of good ideas but no silver bullets. I’ll have to keep playing around and see if it’s all worth it or if the alternative compromises to have the copper do the work are possible.
Forum: Coders. Asm / Hardware 14 April 2022, 05:08
Replies: 19
Views: 2,236
Posted By Jobbo
Stable cpu raster bars?

Yes I know that the copper is the right tool for implementing stable raster color bars.

But what if the copper is already very busy!

I'm using the cpu to change the background color halfway...
Forum: Coders. Asm / Hardware 11 April 2022, 16:00
Replies: 31
Views: 2,687
Posted By Jobbo
Thanks Ross That makes sense and I think my...

Thanks Ross

That makes sense and I think my understanding is accurate.

It's really great to have you and others on here to answer questions about these details!
Forum: Coders. Asm / Hardware 11 April 2022, 15:01
Replies: 31
Views: 2,687
Posted By Jobbo
Most code I've seen will acknowledge the intreq...

Most code I've seen will acknowledge the intreq as soon as possible. It's clear thought that it needs to be after the cia acknowledgement.

However, in your example if the code in the handler takes...
Forum: Coders. Asm / Hardware 11 April 2022, 05:16
Replies: 31
Views: 2,687
Posted By Jobbo
I’d say I have it all worked out now. But that...

I’d say I have it all worked out now. But that bug really tripped me up.
Forum: Coders. Asm / Hardware 11 April 2022, 04:31
Replies: 31
Views: 2,687
Posted By Jobbo
I seem to be running into a bug. When I set the...

I seem to be running into a bug. When I set the Alarm to 0x000000 then I get an interrupt at TOD == 0x001000. I see Toni mentioning it in some other thread. Seems weird, am I mistaken?
Forum: Coders. Asm / Hardware 11 April 2022, 04:11
Replies: 31
Views: 2,687
Posted By Jobbo
I could just ignore the alarm flag but I'd like...

I could just ignore the alarm flag but I'd like to know how to use the alarm timer for interrupts in which case I'd like to set it up in a clean known state. As it stands I'm confused about using the...
Forum: Coders. Asm / Hardware 10 April 2022, 19:46
Replies: 31
Views: 2,687
Posted By Jobbo
I found the info for Flag. It’s todo with the...

I found the info for Flag. It’s todo with the handshake stuff and not really something I need to think about.
Forum: Coders. Asm / Hardware 10 April 2022, 19:11
Replies: 31
Views: 2,687
Posted By Jobbo
Another issue I'd like to clean up is that my...

Another issue I'd like to clean up is that my sample will receive an unexpected Alarm interrupt.

This must be because I'm not turning off the Alarm in my setup code. But I can't figure out how to...
Forum: Coders. Asm / Hardware 10 April 2022, 16:20
Replies: 31
Views: 2,687
Posted By Jobbo
But they both do things in the opposite order...

But they both do things in the opposite order which seems to be where you have a problem.

Here is the code from LSP:

move.w #$2000,$dff09c
btst.b #0,$bfdd00
beq.s .skipa
Forum: Coders. Asm / Hardware 10 April 2022, 14:36
Replies: 31
Views: 2,687
Posted By Jobbo
Thank you! :spin When clearing INTREQ the...

Thank you! :spin

When clearing INTREQ the system must immediately re-trigger the EXTER interrupt because the ICR has not been cleared, which explains why I get a second interrupt call.

This...
Forum: Coders. Asm / Hardware 10 April 2022, 14:27
Replies: 31
Views: 2,687
Posted By Jobbo
I did check and for the unexpected interrupt call...

I did check and for the unexpected interrupt call the ICR returned zero which was confusing.


However Toni's explanation is perfect and now I get it!
Forum: Coders. Asm / Hardware 10 April 2022, 05:41
Replies: 31
Views: 2,687
Posted By Jobbo
CIAB A-timer interrupt confusion?

Hi there

I'm learning how to use the CIA timers for the first time. With help from Roondar over on Discord I've figured out some of what was confusing me.

However, I'm still very confused about...
Forum: Coders. Asm / Hardware 18 March 2022, 16:09
Replies: 14
Views: 2,186
Posted By Jobbo
Love your Win32 retro inspired demos! I too...

Love your Win32 retro inspired demos!

I too wish there was a more central place for OCS specific demo-making discussion. EAB seems like the best place so far but it can be pretty quiet for long...
Forum: Retrogaming General Discussion 11 February 2022, 14:57
Replies: 12
Views: 967
Posted By Jobbo
If you're just getting started I wouldn't even do...

If you're just getting started I wouldn't even do it on the Amiga itself or the emulator.

I would play around with EASy68k which is a Window editor/assembler/simulator http://www.easy68k.com/
...
Forum: Coders. Asm / Hardware 21 January 2022, 14:15
Replies: 29
Views: 2,390
Posted By Jobbo
I looked it up and dff000 is not in chip ram. I...

I looked it up and dff000 is not in chip ram. I guessed as much but couldn’t remember. What a pity. That would have been fun!
Forum: Coders. Asm / Hardware 21 January 2022, 13:27
Replies: 29
Views: 2,390
Posted By Jobbo
I love all these alternate ideas for something...

I love all these alternate ideas for something seemingly so simple.

But nobody has suggested using the blitter to set a bunch of color registers. Is that possible? How fast would it be with nasty...
Forum: Coders. Asm / Hardware 15 January 2022, 05:19
Replies: 4
Views: 1,173
Posted By Jobbo
Old Demoscene Sources

I pulled my old routines from my A1200 and put them up on github for anyone who might find them interesting:


https://github.com/rjobling/Old-Jobbo-Amiga-Code
Forum: Coders. General 23 December 2021, 20:20
Replies: 20
Views: 3,875
Posted By Jobbo
Zero I see what you're saying and I think...

Zero

I see what you're saying and I think it's a really excellent idea.

Likely much better use of bandwidth than dual-playfield.

I could imagine Lotus2 might even manage to squeak out 50hz...
Forum: Coders. Asm / Hardware 22 December 2021, 14:45
Replies: 13
Views: 2,197
Posted By Jobbo
I have it working. And the explanation makes...

I have it working. And the explanation makes sense. I'm just not sure why adjusting the scroll by 10 is my magic number. Doesn't really matter I suppose.

It's only working if I wait for hpos $e0....
Forum: Coders. Asm / Hardware 22 December 2021, 05:46
Replies: 13
Views: 2,197
Posted By Jobbo
From what I can tell adding $a to whatever the...

From what I can tell adding $a to whatever the offset is supposed to be is what's required.

In my 4bitplane test I need to wait for hpos 112 or $00e1 in the wait command.

Seven Sea's is...
Forum: Coders. Asm / Hardware 22 December 2021, 05:21
Replies: 13
Views: 2,197
Posted By Jobbo
Do you have more details about how exactly to fix...

Do you have more details about how exactly to fix the glitch?


For example if bplcon1 is supposed to be $11 it looks like Seven Sea's will set it per line near the hpos start and then set it to...
Forum: Coders. Asm / Hardware 19 December 2021, 06:26
Replies: 8
Views: 1,268
Posted By Jobbo
For the 255-0 split is there something special...

For the 255-0 split is there something special about waiting for $ffdf versus waiting for $ffe1?
Forum: Coders. Asm / Hardware 19 December 2021, 05:04
Replies: 8
Views: 1,268
Posted By Jobbo
What I'm really trying to do is modify bplxmod...

What I'm really trying to do is modify bplxmod each line so it'll cause the same line to be repeated 3 times.

I'm trying to set this up so it'll work across both the 128/0 and 255/0 splits. I'm...
Forum: Coders. Asm / Hardware 19 December 2021, 03:37
Replies: 8
Views: 1,268
Posted By Jobbo
I get that. But I’m still confused why it still...

I get that. But I’m still confused why it still works when my hpos wait is $d7

What you seem to imply is that I would need a wait for the start and one for the end.

What I’d like is just one...
Forum: Coders. Asm / Hardware 19 December 2021, 01:15
Replies: 8
Views: 1,268
Posted By Jobbo
Copper Wait Masks

Hi

I'm trying to understand as much as possible how the copper wait masks work for some copper loops I'm having trouble with.

What I really don't understand is why some h-positions cause...
Forum: Coders. Asm / Hardware 07 November 2021, 19:06
Replies: 23
Views: 3,414
Posted By Jobbo
I'm in the middle of trying to use copper loops...

I'm in the middle of trying to use copper loops to repeat an arbitrary length pattern starting and ending at arbitrary y locations.

What's tricky with copper loops seems to be that you need to...
Forum: Coders. Asm / Hardware 29 October 2021, 04:34
Replies: 3
Views: 1,843
Posted By Jobbo
Fast rounding code?

Hi

I'm working on something where I need to efficiently round down to the nearest multiple for different rounding values.

This is on 68000 and the rounding values are 2 through 16.

Obviously...
Forum: Coders. Asm / Hardware 22 October 2021, 17:36
Replies: 10
Views: 1,167
Posted By Jobbo
I found it online myself.

I found it online myself.
Forum: Coders. Asm / Hardware 22 October 2021, 15:30
Replies: 10
Views: 1,167
Posted By Jobbo
Thanks everyone, I'll see if it's worth using the...

Thanks everyone, I'll see if it's worth using the fixed size version.





Does anyone have a collection of these tips somewhere? Or a good alternative read with lots of ideas.
Forum: Coders. Asm / Hardware 22 October 2021, 15:09
Replies: 59
Views: 6,240
Posted By Jobbo
Ross, thanks for sharing. Do you have any...

Ross, thanks for sharing. Do you have any released demos from the past that I can watch? You always have some good insight on lots of topics, but I don't know of your work.
Forum: Coders. Asm / Hardware 22 October 2021, 05:45
Replies: 10
Views: 1,167
Posted By Jobbo
Fast switch statement code

I've found the need to write what is essentially a switch case.


Is there a better approach than the one I've got below?

Or is there a cleaner way to specify the same code?


; d1 =...
Forum: Coders. Asm / Hardware 22 October 2021, 05:21
Replies: 59
Views: 6,240
Posted By Jobbo
a/b Where can I see that effect, it sounds...

a/b

Where can I see that effect, it sounds awesome!!!

I always loved those rare rotation effects like in Brian the Lion that used an iterative vertical skew.

Actually, yours sounds like the...
Forum: Coders. Asm / Hardware 21 October 2021, 22:51
Replies: 59
Views: 6,240
Posted By Jobbo
I think that is starting to make sense. ...

I think that is starting to make sense.

"Feedback" is sort of what I meant by "incremental".

I'm still fuzzy on how you are applying it, but maybe one day I'll have a go.
Forum: Coders. Asm / Hardware 21 October 2021, 22:05
Replies: 59
Views: 6,240
Posted By Jobbo
With the incremental approach it seems like you...

With the incremental approach it seems like you could just run a wave of 16 or maybe 8 pixel wide blits through there if that makes sense.

You could do the even columns first with no need to...
Forum: Coders. Asm / Hardware 21 October 2021, 21:59
Replies: 59
Views: 6,240
Posted By Jobbo
Ross, I don't really follow what you are saying. ...

Ross, I don't really follow what you are saying.

Would be curious to see the code or an executable to fiddle with.

Never the less it seems like it'd be possible to reduce the number of blits...
Showing results 1 to 40 of 263

 
Forum Jump

All times are GMT +2. The time now is 21:23.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2022, vBulletin Solutions Inc.
Page generated in 0.11427 seconds with 10 queries