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Forum: Nostalgia & memories 28 February 2019, 13:31
Replies: 50
Views: 6,157
Posted By Old_Bob
An AGA version of Jetfighter II would have been...

An AGA version of Jetfighter II would have been fantastic. My Blizzard MKIV could have been put to some very good use on it. If only they'd made the damned game.

B
Forum: Amiga scene 28 February 2019, 13:18
Replies: 20
Views: 2,066
Posted By Old_Bob
It loads and runs using all the WinUAE quick...

It loads and runs using all the WinUAE quick launch configs so this is puzzling.

Can you give me some details? Where, when and how, etc...

Also, what spec is your machine?

B
Forum: Amiga scene 23 February 2019, 15:48
Replies: 20
Views: 2,066
Posted By Old_Bob
40Mhz! I'm surprised that there's quite so much...

40Mhz! I'm surprised that there's quite so much difference. Especially because it's the blitter doing all the heavy lifting in drawing the enemies.

Thanks, dude.

B
Forum: Amiga scene 21 February 2019, 14:38
Replies: 20
Views: 2,066
Posted By Old_Bob
Interesting stuff, thanks. The quicklaunch...

Interesting stuff, thanks.

The quicklaunch bare-bones A1200 in WinUAE is finishing each frame a bit quicker than your ACA, by around of 4 or 5 scanlines. Slightly surprising. It would be nice to...
Forum: Amiga scene 20 February 2019, 13:33
Replies: 20
Views: 2,066
Posted By Old_Bob
Good news, dude. Thanks. Now, it's...

Good news, dude. Thanks.

Now, it's *finally* time to get the enemies moving.

What spec is your A1200? Can you let me know the four figure hex value that's under the lives counter when it's...
Forum: Amiga scene 17 February 2019, 15:08
Replies: 20
Views: 2,066
Posted By Old_Bob
Hey, dudes. Got another version of this that...

Hey, dudes.

Got another version of this that could do with some testing.

There isn't much that you'll notice as being different when it's running, but I've made quite a few under-the-hood...
Forum: Amiga scene 25 September 2018, 13:30
Replies: 20
Views: 2,066
Posted By Old_Bob
Good news! Thanks, dude. This is the...

Good news! Thanks, dude.



This is the config I've been mostly using for testing here. This, along with the standard 500+, 600 and 1200 should all (hopefully) be fine. It's all the various...
Forum: Amiga scene 24 September 2018, 19:50
Replies: 20
Views: 2,066
Posted By Old_Bob
Bomb Jack - The other version...

Hey, dudes.

I've finally got around to putting a bit of effort in to this over the last few days and it's now at the stage that requires testing on real hardware.

If those of you with working...
Forum: Coders. Asm / Hardware 19 September 2018, 14:36
Replies: 9
Views: 789
Posted By Old_Bob
Got this sorted, at last. It turns out you...

Got this sorted, at last.

It turns out you were all correct in that there was a stray SECTION data,DATA statement buried away in one of the includes from yonks ago. :banghead

It now works as...
Forum: Coders. Asm / Hardware 19 September 2018, 11:55
Replies: 9
Views: 789
Posted By Old_Bob
I put this in so I can keep an eye on the size of...

I put this in so I can keep an eye on the size of the game as it grows. There's a small routine at the start of the program that uses it to print out the address of the last byte when it runs.
...
Forum: Coders. Asm / Hardware 18 September 2018, 20:16
Replies: 9
Views: 789
Posted By Old_Bob
Thanks, dude. I'm using only the ORG...

Thanks, dude.

I'm using only the ORG statement, with no code sections of any kind in the source. The binary vasm outputs looks like part of the graphics/bob data. There's no actual code as such,...
Forum: Coders. Asm / Hardware 18 September 2018, 11:41
Replies: 9
Views: 789
Posted By Old_Bob
Absolute addressing

Hey, dudes.

I've been revisiting my Bombjack game in the last few days, after a little break, and have run in to a bit of an obstacle.

I'd like to use absolute addressing, but it's proving to...
Forum: support.WinUAE 05 April 2018, 23:53
Replies: 4
Views: 678
Posted By Old_Bob
No need, dude. It turns out that the...

No need, dude.

It turns out that the routine that updates that sprite was occasionally being called at just the time the data was getting read during the frame.

Moving a single JSR...
Forum: support.WinUAE 05 April 2018, 17:53
Replies: 4
Views: 678
Posted By Old_Bob
Thanks, dude. After some testing using the...

Thanks, dude.

After some testing using the quickstart configs, it's both OCS and ECS that exhibit the behaviour. It seems to manifest itself slightly differently, though, when emulating a 500,...
Forum: support.WinUAE 05 April 2018, 14:39
Replies: 4
Views: 678
Posted By Old_Bob
Hardware Sprite Glitch

I've noticed an odd bit of weirdness with one of the sprites in my Bomb Jack game...

http://eab.abime.net/picture.php?albumid=480&pictureid=3127

There are two halves, more or less, of different...
Forum: Coders. Asm / Hardware 19 January 2018, 20:01
Replies: 18
Views: 903
Posted By Old_Bob
I guess this is why I see MOVE.L when I'm in the...

I guess this is why I see MOVE.L when I'm in the WinUAE debugger, even though my source has MOVEQ. Why would an assembler even have a preference? It surely can't be optimization, at least in this...
Forum: Coders. General 27 December 2017, 17:31
Replies: 125
Views: 17,942
Posted By Old_Bob
All in asm, yes. I started off with it going in...

All in asm, yes. I started off with it going in 512kb but it was looking like getting absolutely everything in there might be a little bit of a squeeze, so quite early on I settled on 1mb.

My one...
Forum: Coders. General 27 December 2017, 14:34
Replies: 125
Views: 17,942
Posted By Old_Bob
No probs, dude. I started out on mine pretty...

No probs, dude. I started out on mine pretty much the same way. Real life got in the way during the last half of the year and, as it turns out, it was only the last week or so that I actually got...
Forum: Coders. General 26 December 2017, 16:34
Replies: 125
Views: 17,942
Posted By Old_Bob
What's this?!?!? Another fellow doing a Bomb...

What's this?!?!? Another fellow doing a Bomb Jack port?!?!?

Looking great, dude. Your February finish date should beat me by at least a couple of years, lol. I've currently got mine pencilled...
Forum: Coders. General 11 November 2017, 01:04
Replies: 493
Views: 39,250
Posted By Old_Bob
Playing in MAME today for a bit, it's definitely...

Playing in MAME today for a bit, it's definitely not managing everything every frame and it really chugs during the busy bits. The upside of that is that any Amiga version could maybe get away with...
Forum: Coders. General 10 November 2017, 03:50
Replies: 493
Views: 39,250
Posted By Old_Bob
I think restricting things to 512kb Chip RAM...

I think restricting things to 512kb Chip RAM seems a little stingy. Actually, why even bother with OCS? An A1200 with Fast RAM could do a much nicer version, with far fewer compromises required.
...
Forum: Amiga scene 25 October 2017, 18:52
Replies: 67
Views: 4,997
Posted By Old_Bob
I'm not so sure I agree with this. Much like the...

I'm not so sure I agree with this. Much like the A1200, I feel that C= gave us the barest of minimums they could get away with and still call it an upgrade over the old machine.

If we had...
Forum: Coders. General 24 August 2017, 12:29
Replies: 7
Views: 1,765
Posted By Old_Bob
For something like the big snake in R-Type, or...

For something like the big snake in R-Type, or the attack patterns in Galaga, I'd think a simple array would be both the easiest to program, and the fastest to execute. You have to blow a bunch of...
Forum: Coders. General 10 August 2017, 14:17
Replies: 28
Views: 2,756
Posted By Old_Bob
I've no knowledge of the CPC emulator, but the...

I've no knowledge of the CPC emulator, but the Speccy one I used to use, in times of yore, needed a reasonably fast '020/030 and some Fast RAM to approach playable levels of performance. It...
Forum: Coders. General 10 August 2017, 11:29
Replies: 28
Views: 2,756
Posted By Old_Bob
What about speed? An A500 surely couldn't...

What about speed? An A500 surely couldn't emulate a Z80, or 6502, or anything else at the speed required, on top of doing all the other stuff the game might need. If it could, you might as well...
Forum: Coders. General 08 August 2017, 17:23
Replies: 28
Views: 2,756
Posted By Old_Bob
Now, that's a bit more like it. :) B

Now, that's a bit more like it. :)

B
Forum: Coders. General 08 August 2017, 17:17
Replies: 28
Views: 2,756
Posted By Old_Bob
Thanks, dude. :great Agreed. Even...

Thanks, dude. :great



Agreed. Even with the work that's already been put in to the disassembly, it's still a huge task.

B
Forum: Coders. General 08 August 2017, 12:58
Replies: 28
Views: 2,756
Posted By Old_Bob
Yep. I haven't intergrated the enemies in to the...

Yep. I haven't intergrated the enemies in to the engine yet, but test programs reveal that 50fps should be easily attainable with everything going. The A500 blitter can cope with pretty much twice...
Forum: Coders. General 08 August 2017, 12:05
Replies: 28
Views: 2,756
Posted By Old_Bob
Yep, the port that Elite released is nothing...

Yep, the port that Elite released is nothing short of a disgrace. My own early efforts show that an A500 is easily capable of an almost perfect reproduction of the coin-op. As soon as I can figure...
Forum: Coders. General 08 August 2017, 00:30
Replies: 28
Views: 2,756
Posted By Old_Bob
Taking problems two and three first... I...

Taking problems two and three first...

I don't think the difference between 50 and 60fps would be a big deal when the Amiga game is played in isolation. Someone can correct me if i'm wrong but I...
Forum: Coders. General 27 July 2017, 18:50
Replies: 220
Views: 16,960
Posted By Old_Bob
Would a Vampire board be necessary to do Command...

Would a Vampire board be necessary to do Command & Conquer? I haven't actually played any version of it, but watching this, admittedly short, little gameplay vid, it doesn't strike me as something...
Forum: Coders. Asm / Hardware 21 July 2017, 20:59
Replies: 12
Views: 1,025
Posted By Old_Bob
Is there no handy system variable tucked away...

Is there no handy system variable tucked away somewhere that has the amount of Chip & Fast RAM that we can read to get an easy answer?

B
Forum: Coders. Asm / Hardware 17 July 2017, 10:16
Replies: 12
Views: 2,004
Posted By Old_Bob
As a relative Amiga programming novice, I find...

As a relative Amiga programming novice, I find this rather interesting. How is the blitter repointed to the correct address in each bitplane as it works through the data? Also, wouldn't this...
Forum: Retrogaming General Discussion 17 July 2017, 10:01
Replies: 35
Views: 3,242
Posted By Old_Bob
I agree. In terms of the games market over...

I agree.

In terms of the games market over the 16bit era; sure, you could potentially make shed loads more with a big hit on a console, but that doesn't mean that companies like Sensible, DMA or...
Forum: Nostalgia & memories 11 July 2017, 13:44
Replies: 147
Views: 15,379
Posted By Old_Bob
That's the point. HD floppies just being another...

That's the point. HD floppies just being another small part of it.

The Amiga represented the state of the art in personal computer technology in 1985. But the C= management didn't want to spend...
Forum: Retrogaming General Discussion 11 July 2017, 13:13
Replies: 115
Views: 12,809
Posted By Old_Bob
The Sinclair ZX Spectrum is the single greatest...

The Sinclair ZX Spectrum is the single greatest home computer in the known universe*.

There, i've said it. :crazy

All those days and nights in my bedroom in front of my little B&W portable...
Forum: Nostalgia & memories 11 July 2017, 12:40
Replies: 147
Views: 15,379
Posted By Old_Bob
Another thing that should have taken care of in...

Another thing that should have taken care of in the early days. HD floppy drives for the A500/2000 would have certainly helped a great deal later down the line.

More shortsightedness from the...
Forum: Nostalgia & memories 06 July 2017, 16:18
Replies: 147
Views: 15,379
Posted By Old_Bob
Even more reason, therefore, to have that set in...

Even more reason, therefore, to have that set in stone from the outset.

It just seems to me to be such an incredible waste not to have 64 colour registers to go along with 6 planes.

This...
Forum: Nostalgia & memories 06 July 2017, 15:40
Replies: 147
Views: 15,379
Posted By Old_Bob
Hmm, it would seem that my recollection is...

Hmm, it would seem that my recollection is incorrect on this point. A quick check reveals that some 1000s were shipped with a Denise capable of EHB and some not. So, presumably all 500s were, in...
Forum: Nostalgia & memories 06 July 2017, 15:15
Replies: 147
Views: 15,379
Posted By Old_Bob
Some things off of my Amiga "It would be nice...

Some things off of my Amiga "It would be nice if..." pile :)

1. A faster CPU.

Even in '85 when the first machine was released the 68000 was getting a bit long in the tooth. Fast forward to...
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