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Search took 0.05 seconds. Search: Posts Made By: Bruce Abbott
Forum: Amiga scene Yesterday, 09:22
Replies: 524
Views: 28,519
Posted By Bruce Abbott
A memory slot would have been a problem, because...

A memory slot would have been a problem, because it would have cost more money as well as making life more complicated for users.

The storage capacity could have been a bit larger (and I'm sure...
Forum: Amiga scene Yesterday, 08:44
Replies: 524
Views: 28,519
Posted By Bruce Abbott
Yep, a lot of people have delusions. One of them...

Yep, a lot of people have delusions. One of them is that the capabilities of other consoles such as the Megadrive, SNES, PlayStation or Xbox have anything to do with this thread. They are not Amigas,...
Forum: Retrogaming General Discussion 21 January 2021, 13:34
Replies: 56
Views: 2,582
Posted By Bruce Abbott
Who said the PC was 'virtually unknown and...

Who said the PC was 'virtually unknown and struggling'?
Forum: Amiga scene 20 January 2021, 11:00
Replies: 524
Views: 28,519
Posted By Bruce Abbott
Wow, what a tirade! There are good reasons...

Wow, what a tirade!

There are good reasons for putting the power switch on the back - it keeps the power wiring short to reduce voltage drop, allows use of a reliable toggle switch rather than a...
Forum: Amiga scene 19 January 2021, 23:28
Replies: 524
Views: 28,519
Posted By Bruce Abbott
And AGA has 8 bits per channel, so it's even...

And AGA has 8 bits per channel, so it's even better than the SNES. With AGA you can display 256 shades of gray, the others can't. Even VGA can't can't do it (only 6 bits per channel).

AGA can...
Forum: Coders. Asm / Hardware 18 January 2021, 02:55
Replies: 141
Views: 7,178
Posted By Bruce Abbott
That's right. I was only interested in how many...

That's right. I was only interested in how many bits were involved, no how much distortion or noise may be present. However my results do show that where it matters most (quiet parts of the music)...
Forum: Amiga scene 18 January 2021, 01:43
Replies: 99
Views: 4,033
Posted By Bruce Abbott
Yes, and Commodore knew that. They put a lot of...

Yes, and Commodore knew that. They put a lot of effort into making the Amiga more than just a games machine.

Yes, but it didn't fail due to not having high end graphics - it failed simply...
Forum: Coders. Asm / Hardware 17 January 2021, 14:29
Replies: 141
Views: 7,178
Posted By Bruce Abbott
I created a sequence of 1kHz tones at different...

I created a sequence of 1kHz tones at different levels ranging from 0dB to -90dB using Audacity on my PC, then played them on my A1200 in Eagle player with its 'calibrated 14 bit' engine. Going down...
Forum: Amiga scene 17 January 2021, 01:29
Replies: 99
Views: 4,033
Posted By Bruce Abbott
...they would have magically increased sales to...

...they would have magically increased sales to the same level as PCs, convincing the iD team to port Doom to the Amiga? You're dreaming.

Not just the Amiga. Where was Atari, Acorn, Sinclair,...
Forum: Amiga scene 16 January 2021, 12:56
Replies: 99
Views: 4,033
Posted By Bruce Abbott
Forgive me father, for I have sinned.

Forgive me father, for I have sinned.
Forum: Coders. Asm / Hardware 16 January 2021, 03:42
Replies: 22
Views: 871
Posted By Bruce Abbott
For 68000 only? 1 instruction, 4 bytes, no...

For 68000 only?

1 instruction, 4 bytes, no registers. But... self-modifying code! :evilgrin

ScreenNum = _displayScreen+2 ; high byte of bsr offset

_displayScreen:
bsr.w _displayScreen0
...
Forum: Coders. Asm / Hardware 16 January 2021, 00:32
Replies: 141
Views: 7,178
Posted By Bruce Abbott
By definition, a DAC that uses 14 bits to produce...

By definition, a DAC that uses 14 bits to produce its output is 14 bit. However the result may not be be accurate to 14 bits.

Actually you are both 'right'. In 14 bit mode Paul has a resolution...
Forum: Coders. Asm / Hardware 12 January 2021, 09:57
Replies: 141
Views: 7,178
Posted By Bruce Abbott
Can you do the same with this? ...

Can you do the same with this?

https://www.mediacollege.com/audio/tone/files/100Hz_44100Hz_16bit_30sec.wav

(from here (https://www.mediacollege.com/audio/tone/download/)).
Forum: Amiga scene 12 January 2021, 03:43
Replies: 99
Views: 4,033
Posted By Bruce Abbott
Yep - Doom wasn't the cause, it was an effect. ...

Yep - Doom wasn't the cause, it was an effect.

Take a look at the graphs below and you will see that the Amiga never really had a chance.

Commodore certainly made a lot of mistakes, but...
Forum: Coders. Asm / Hardware 11 January 2021, 09:32
Replies: 24
Views: 987
Posted By Bruce Abbott
Why do you want to do this?

Why do you want to do this?
Forum: Amiga scene 10 January 2021, 23:31
Replies: 32
Views: 1,417
Posted By Bruce Abbott
For ROMs and OS you could use Amiga Forever, or...

For ROMs and OS you could use Amiga Forever, or let customers purchase and 'install' it themselves (and if they use a pirate copy that's on them ;) ). The actual installation would be completely...
Forum: Coders. System 10 January 2021, 04:40
Replies: 16
Views: 1,042
Posted By Bruce Abbott
What's special about it?

What's special about it?
Forum: Amiga scene 10 January 2021, 04:26
Replies: 32
Views: 1,417
Posted By Bruce Abbott
Good idea. If people buy these instead of real...

Good idea. If people buy these instead of real Amigas it might relieve the pressure on A1200 and CD32 prices.

Probably not, so don't bother trying. Paying for licenses would just cut into your...
Forum: Amiga scene 09 January 2021, 10:13
Replies: 139
Views: 17,064
Posted By Bruce Abbott
Or perhaps they didn't think panning was worth it...

Or perhaps they didn't think panning was worth it when most people would be using a mono TV? I used to think that not having panning was a mistake, but now I don't mind. Fixed outputs make the...
Forum: Amiga scene 09 January 2021, 09:16
Replies: 139
Views: 17,064
Posted By Bruce Abbott
In practice the ideas were bad, because they...

In practice the ideas were bad, because they couldn't implement them in a timely manner. That's why successful designers don't try to do too much at once. You see this in most electronic devices, in...
Forum: Coders. Asm / Hardware 09 January 2021, 07:58
Replies: 27
Views: 1,279
Posted By Bruce Abbott
PC relative and address register relative reads...

PC relative and address register relative reads are the same speed, but there is a large penalty for writing to PC relative variables. You either have to load an address register with the address...
Forum: Coders. Asm / Hardware 08 January 2021, 21:30
Replies: 9
Views: 676
Posted By Bruce Abbott
Yes, only D1-D7 are used for sample data. POUT...

Yes, only D1-D7 are used for sample data. POUT and BUSY are output only, and SEL is input (horizontal sync pulse detect).

BTW I made a compatible digitizer that used digital timing for better...
Forum: Coders. System 08 January 2021, 07:23
Replies: 16
Views: 1,042
Posted By Bruce Abbott
That's what I thought. In my experience it's best...

That's what I thought. In my experience it's best to leave working code alone unless you have a good reason to change it. Apart from the satisfaction of making it 'tidier', what tangible benefits...
Forum: Coders. Asm / Hardware 08 January 2021, 06:54
Replies: 9
Views: 676
Posted By Bruce Abbott
It might help if you understood how the DigiView...

It might help if you understood how the DigiView framegrabber worked. Many years ago I traced the circuit of the original A1000 version (which wasn't easy because it was potted in epoxy which I had...
Forum: Amiga scene 08 January 2021, 06:02
Replies: 139
Views: 17,064
Posted By Bruce Abbott
In reality yes, but we are not talking reality...

In reality yes, but we are not talking reality here.





Ah yes, so many things Commodore 'should' have done. Well I for one am glad they didn't.

Commodore tried to make a chipset with all...
Forum: Amiga scene 07 January 2021, 23:51
Replies: 524
Views: 28,519
Posted By Bruce Abbott
Amiga CD32...

Amiga CD32 (https://en.wikipedia.org/wiki/Amiga_CD32): Announced July 16 1993, released Sept 1993.

Doom (https://en.wikipedia.org/wiki/Doom_(franchise)): released December 10 1993.

There's no...
Forum: Amiga scene 07 January 2021, 11:31
Replies: 31
Views: 1,340
Posted By Bruce Abbott
I have a CNET CN40BC PCMCIA network card on my...

I have a CNET CN40BC PCMCIA network card on my A1200 (50MHz 030), and a Genius ME3000II PCMCIA card on the A600 (Vampire 600). Software is Roadshow and SMB-Handler 0.20.

Copying a 14MB file into...
Forum: Coders. System 06 January 2021, 22:42
Replies: 16
Views: 1,042
Posted By Bruce Abbott
Why?

Why?
Forum: Coders. Asm / Hardware 06 January 2021, 11:15
Replies: 323
Views: 13,505
Posted By Bruce Abbott
Well let's see...

Well let's see (https://amigastore.eu/en/261-amiga-os-39.html).

First off, nobody seems to have it in stock.

Then there are the system requirements:-

An Amiga. OK, I think I can manage that....
Forum: Coders. Asm / Hardware 06 January 2021, 10:52
Replies: 323
Views: 13,505
Posted By Bruce Abbott
I did say 'imagine'. But when Commodore took over...

I did say 'imagine'. But when Commodore took over the Amiga was not a finished product, and it probably never would have been if they hadn't taken it on.

Correct, or more accurately to stop...
Forum: Coders. Asm / Hardware 05 January 2021, 11:05
Replies: 323
Views: 13,505
Posted By Bruce Abbott
One man's meat is another man's poison. ...

One man's meat is another man's poison.

Imagine you are Commodore and you want to make the Amiga flexible enough to take any graphics card with unknown capabilities, like the PC. So you put slots...
Forum: Amiga scene 05 January 2021, 08:50
Replies: 122
Views: 6,404
Posted By Bruce Abbott
Why not?

Why not?
Forum: Coders. Asm / Hardware 05 January 2021, 04:03
Replies: 323
Views: 13,505
Posted By Bruce Abbott
Not exactly the same. Obviously software written...

Not exactly the same. Obviously software written specifically for the Video Toaster only works with it, since making the Video Toaster work is its function. But the Video Toaster came with LightWave...
Forum: Coders. Asm / Hardware 04 January 2021, 05:58
Replies: 323
Views: 13,505
Posted By Bruce Abbott
Nah, we'll just keep blaming the victims. :mad

Nah, we'll just keep blaming the victims. :mad
Forum: Coders. Asm / Hardware 04 January 2021, 05:40
Replies: 323
Views: 13,505
Posted By Bruce Abbott
On a PC you don't even know what you are doing....

On a PC you don't even know what you are doing. The hardware is abstracted away, and they don't want to tell you how it works. In fact it's irrelevant, because even if you did know that knowledge is...
Forum: Amiga scene 04 January 2021, 01:18
Replies: 524
Views: 28,519
Posted By Bruce Abbott
Problem is that do the job properly you need 2...

Problem is that do the job properly you need 2 CIA chips, which were only available from Commodore and quite expensive. But they also provide all the I/O lines needed for the parallel and serial...
Forum: Coders. Asm / Hardware 03 January 2021, 12:08
Replies: 323
Views: 13,505
Posted By Bruce Abbott
Yeah, that's the idea - don't need hardware, just...

Yeah, that's the idea - don't need hardware, just do it all with the CPU! I remember when 'software' MODEMs came out. "Don't need a dedicated DSP chip and control MCU", they said, "the Pentium has so...
Forum: Coders. Asm / Hardware 02 January 2021, 05:26
Replies: 323
Views: 13,505
Posted By Bruce Abbott
Indeed. What many people don't realize is that an...

Indeed. What many people don't realize is that an 8 bit sample with separately controlled volume envelope is effectively many more bits. 2 channels of 8 bit samples are equivalent to 14 bit mixed...
Forum: Coders. Asm / Hardware 02 January 2021, 04:40
Replies: 323
Views: 13,505
Posted By Bruce Abbott
Neither did Microsoft at the time. The only 'lack...

Neither did Microsoft at the time. The only 'lack of resources' that prevented Commodore from doing it was simply that they were bankrupt and no longer existed.

But that doesn't mean Commodore...
Forum: Retrogaming General Discussion 01 January 2021, 13:29
Replies: 143
Views: 7,204
Posted By Bruce Abbott
Its 2021, and memory expansions are cheap. Why do...

Its 2021, and memory expansions are cheap. Why do we have to limit it to stock machines?

Of course not. I don't remember even seeing these games on the original machines, so I wouldn't know how...
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