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Forum: Hardware mods Yesterday, 11:49
Replies: 116
Views: 13,024
Posted By zero
Someone like JLPCB or Seeed Studio will do small...

Someone like JLPCB or Seeed Studio will do small assembly runs, minimum 5 boards. You could get everything soldered up that way, then you just need to plug your chips in and test it.

For that...
Forum: Hardware mods 17 October 2019, 11:10
Replies: 55
Views: 10,898
Posted By zero
If there was enough interest there are companies...

If there was enough interest there are companies like Seeed Studio and JLPCB in China who will do small run board assembly. They could easily crank out say 10 boards that would then just need...
Forum: Hardware mods 16 October 2019, 12:40
Replies: 2
Views: 192
Posted By zero
Back in the day I used a PS2 keyboard with an...

Back in the day I used a PS2 keyboard with an adapter. It's okay.
Forum: Hardware mods 02 October 2019, 10:10
Replies: 116
Views: 13,024
Posted By zero
So what do you need to build one of these? The...

So what do you need to build one of these? The PCB of course, and lots of off-the-shelf parts. Are the custom chips easily available?
Forum: support.Hardware 23 August 2019, 18:38
Replies: 6
Views: 299
Posted By zero
Yeah... In many ways using an emulator is better...

Yeah... In many ways using an emulator is better because you can do a real single step, as in the whole machine, custom chips and all. You can't really do that with a real Amiga.

TBH I think the...
Forum: support.Hardware 23 August 2019, 13:16
Replies: 6
Views: 299
Posted By zero
Hmm, maybe it was CPU slot them, same as the...

Hmm, maybe it was CPU slot them, same as the A1200.

I ask because I'm thinking about a possible AR style remote debugger. Lack of custom chip spying wouldn't be a big issue, but lack of the level...
Forum: support.Hardware 23 August 2019, 12:20
Replies: 6
Views: 299
Posted By zero
Yeah, I understand that. But I read that writes...

Yeah, I understand that. But I read that writes into the custom chip address space are not supplied to the Zorro III backplane by Buster.

Section 2.1.2 "Bus Memory Mapping and Cache Support" of...
Forum: support.Hardware 23 August 2019, 10:26
Replies: 6
Views: 299
Posted By zero
Zorro III Action Replay

I read that there was an unreleased Action Replay for the A3000.

The A3000 has Zorro III and my understanding was that Zorro III doesn't pass writes to custom chip registers to the backplane.
...
Forum: Coders. General 23 August 2019, 10:04
Replies: 6
Views: 525
Posted By zero
I was thinking about trying to get VSCode working...

I was thinking about trying to get VSCode working with a 68k toolchain and some way to download/run code. Remote debug is probably a stretch though... I don't know, maybe some kind of "Action Replay"...
Forum: Coders. General 22 August 2019, 09:56
Replies: 28
Views: 4,347
Posted By zero
Yes, you add additional latency to screen...

Yes, you add additional latency to screen updates. 20ms per frame. It's not a big deal for the most part, 20ms is not really noticeable.
Forum: Hardware mods 20 August 2019, 17:44
Replies: 116
Views: 13,024
Posted By zero
The other advantage being that you don't also...

The other advantage being that you don't also need a backplane, it can be like the A2000 with the slots on the main board.

I wonder if the backplane was just because they needed space on the...
Forum: Hardware mods 20 August 2019, 10:27
Replies: 116
Views: 13,024
Posted By zero
Mainly because ATX cases are very easy to get,...

Mainly because ATX cases are very easy to get, including retro looking ones. Didn't I see someone made a new A2000 style case that could take various boards, including ATX.
Forum: Hardware mods 19 August 2019, 10:47
Replies: 116
Views: 13,024
Posted By zero
Out of interest, would Zorro slots fit in the ATX...

Out of interest, would Zorro slots fit in the ATX form factor? I mean is it wide enough to place the Zorro slots far enough towards the front of the case?

Never mind finding a case that has enough...
Forum: Coders. Asm / Hardware 19 August 2019, 10:37
Replies: 95
Views: 6,930
Posted By zero
Gods is one of the best games ever made! I...

Gods is one of the best games ever made!

I think it really depends what type of game you prefer. There is certainly no equivalent to Mario on the Amiga, but also there is nothing like Gods on the...
Forum: Coders. Asm / Hardware 16 August 2019, 11:02
Replies: 95
Views: 6,930
Posted By zero
All the classic NES games are Japanese and a very...

All the classic NES games are Japanese and a very different style to the mostly western games on the Amiga. You can't really compare them directly, it's like trying to decide if heavy metal or jazz...
Forum: Coders. Asm / Hardware 16 August 2019, 10:58
Replies: 95
Views: 6,930
Posted By zero
European and US developers had a very different...

European and US developers had a very different style. They just didn't do that Japanese style of platform and shumup game. Occasionally they came close, Apidya for example, but usually they ended up...
Forum: Coders. Asm / Hardware 15 August 2019, 18:26
Replies: 95
Views: 6,930
Posted By zero
I sometimes wonder if this was because a lot of...

I sometimes wonder if this was because a lot of Amiga users has monitors. The flicker was much more noticeable on a monitor than on a TV. I guess TVs were designed to make the image persist a bit...
Forum: Coders. Asm / Hardware 15 August 2019, 10:39
Replies: 95
Views: 6,930
Posted By zero
I guess you haven't played the original arcade...

I guess you haven't played the original arcade version much. I own an original board, BTW.

The game is played out in a claustrophobic little maze and the ghosts are often right on your tail....
Forum: Coders. Asm / Hardware 14 August 2019, 18:03
Replies: 95
Views: 6,930
Posted By zero
It looks visually impressive, and the player...

It looks visually impressive, and the player enjoys having a huge amount of firepower at their disposal, and feels skillful at avoiding a screen full of bullets and enemies.

Really hardware was...
Forum: Coders. Asm / Hardware 14 August 2019, 15:12
Replies: 95
Views: 6,930
Posted By zero
Yes, that's what pipelining refers to. You need...

Yes, that's what pipelining refers to. You need to arrange the memory accesses so that they happen when the bus is available and use the cycles in-between for other stuff.



Remember that the...
Forum: Coders. Asm / Hardware 14 August 2019, 10:31
Replies: 95
Views: 6,930
Posted By zero
I meant you can pipeline the generation of the...

I meant you can pipeline the generation of the grid address on an A1200... Although I'm starting to wonder if I was right, I forgot there is no swap.w op-code.

But actually there is a better way...
Forum: Coders. Asm / Hardware 13 August 2019, 10:37
Replies: 95
Views: 6,930
Posted By zero
Have a look at the video I posted. It IS very...

Have a look at the video I posted. It IS very inaccurate, but that's the trade-off that Konami made. It favours the player and the game is still a classic and immensely fun.

Very few games have...
Forum: Coders. Asm / Hardware 13 August 2019, 10:32
Replies: 95
Views: 6,930
Posted By zero
"Calculating" the grid coordinate is trivial....

"Calculating" the grid coordinate is trivial. Simply discard the lowest 3 or 4 bits of the X and Y coordinates (depending on your grid size) and combine into a single word. There is some overhead but...
Forum: Coders. Blitz Basic 13 August 2019, 10:25
Replies: 58
Views: 4,216
Posted By zero
Forget printing blocks. Use BCD and blitting....

Forget printing blocks. Use BCD and blitting. Make it the lowest priority, so it only gets done after all other blits are complete if there is any spare time left.
Forum: Coders. Asm / Hardware 12 August 2019, 16:38
Replies: 95
Views: 6,930
Posted By zero
You can, but that's still 6 x memory reads ...

You can, but that's still

6 x memory reads
2 x subtractions
1 x addition
2 x sign check
2 x sign change
1 x comparison/branch

compared to
Forum: Coders. Asm / Hardware 12 August 2019, 10:23
Replies: 95
Views: 6,930
Posted By zero
Then you are doing it wrong ;-) Bounding box...

Then you are doing it wrong ;-)

Bounding box looks like this:

if (x >= box_left) && (x <= box_right) && (y >= box_top) && (y <= box_bottom)

Where as grid looks like this:

if (player_grid...
Forum: Coders. General 12 August 2019, 10:13
Replies: 26
Views: 1,790
Posted By zero
It looks like the robot is only moving at about 5...

It looks like the robot is only moving at about 5 fps anyway. My guess is that it's not using any special hardware for scaling.

SNES games that scaled sprites often used a special chip in the...
Forum: Coders. Asm / Hardware 11 August 2019, 11:44
Replies: 95
Views: 6,930
Posted By zero
Have a look at this video of Gradius on the PC...

Have a look at this video of Gradius on the PC Engine:

https://youtu.be/lRqSp5J-6Mg

The collision detection is "loose" to say the least. The level 1 boss (volcanoes) at 2:30 are a great...
Forum: Coders. Blitz Basic 09 August 2019, 10:32
Replies: 58
Views: 4,216
Posted By zero
I'd just ditch the score display and maybe...

I'd just ditch the score display and maybe Dhalsim if he turns out to be a major problem. No one cares about the score anyway.
Forum: Coders. General 09 August 2019, 10:18
Replies: 28
Views: 4,347
Posted By zero
That's not a bad strategy. Obviously it depends...

That's not a bad strategy. Obviously it depends what system you are targeting, because that will determine how much work you can do between blits.

For example, if you are writing a game for the...
Forum: Coders. General 08 August 2019, 11:58
Replies: 28
Views: 4,347
Posted By zero
Obviously you must pipeline as best you can,...

Obviously you must pipeline as best you can, rather than just start the blitter than then busy wait. If you do it right it's going to be a lot more efficient than entering and exiting an interrupt.
...
Forum: Coders. General 07 August 2019, 11:06
Replies: 28
Views: 4,347
Posted By zero
IRQ handling speed is a bit of a weakness on the...

IRQ handling speed is a bit of a weakness on the Amiga. By the time you saved registers, figured out where the IRQ came from and jumped to the right code you might as well not have bothered in many...
Forum: Coders. General 06 August 2019, 09:57
Replies: 152
Views: 12,116
Posted By zero
Unfortunately if you try to press too many keys...

Unfortunately if you try to press too many keys at once some of them are not registered. Had that problem with Hired Guns deathmatch :)

We are going around in circles here. It's possible to do...
Forum: Coders. General 02 August 2019, 15:09
Replies: 152
Views: 12,116
Posted By zero
Are you use? I just checked the CPS-2 ROM and...

Are you use? I just checked the CPS-2 ROM and it's 7 MB of data, assuming each chip is 100% full. That includes all the sound and graphics for stages etc, plus 12 characters.

For confirmation the...
Forum: Coders. General 02 August 2019, 11:08
Replies: 152
Views: 12,116
Posted By zero
Nice work. How much RAM are you using for that...

Nice work. How much RAM are you using for that sprite?

4 channels of audio turned out to be a bit of a bottleneck. Seemed incredible at the time but if you need two channels for sound effects (one...
Forum: Coders. Asm / Hardware 23 July 2019, 09:49
Replies: 38
Views: 1,961
Posted By zero
Used to, many years ago.

Used to, many years ago.
Forum: Coders. Asm / Hardware 22 July 2019, 18:31
Replies: 38
Views: 1,961
Posted By zero
Ah, that's probably it. It was a long time ago...

Ah, that's probably it. It was a long time ago but I was developing the MHI driver for DCR's parallel port device when I first noticed it. Some 030s would barely see any noticeable load, some would...
Forum: Hardware mods 22 July 2019, 10:22
Replies: 144
Views: 9,849
Posted By zero
Some of the errors may be down to how Kicad...

Some of the errors may be down to how Kicad handles power. If something is marked as a power pin the whole net needs to be connected to something marked as a power supply. There is a "pwr_flag" that...
Forum: Coders. Asm / Hardware 22 July 2019, 10:19
Replies: 38
Views: 1,961
Posted By zero
There are other factors as well as just the CPU...

There are other factors as well as just the CPU type. All 68030 accelerators are not equal!

I'm not sure of the exact reason but it must have something to do with the way the CPU interface to the...
Forum: Coders. Asm / Hardware 19 July 2019, 10:44
Replies: 38
Views: 1,961
Posted By zero
That would be my guess. Back in the day we spent...

That would be my guess. Back in the day we spent a lot of time figuring out how to pipeline memory access, without any real tools so it was mostly trial and error.

The trick was to make sure you...
Showing results 1 to 40 of 336

 
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